[idea] [idea]
\n\u4e94\u82b1\u516b\u95e8\u7684SQL\u4ea7\u54c1\u591a\u5f97\u8981\u547d\uff0c\u6216\u8bb8\u4f60\u65e9\u987e\u4e0d\u5f97\u5176\u5b83\u7529\u5f00\u8896\u5b50\u5c31\u52a8\u624b\u5e72\u4e86\u3002\u4f46\u4f60\u8981\u540c\u65f6\u91c7\u7528ASP\u548cSQL\u7684\u8bdd\u5c31\u53ef\u80fd\u4f1a\u5934\u6655\u3002MySQL\u3001SQL Server\u548cmSQL\u90fd\u662f\u7edd\u4f73\u7684SQL\u5de5\u5177\uff0c\u53ef\u60dc\uff0c\u5728ASP\u7684\u73af\u5883\u4e0b\u4f60\u5374\u7528\u4e0d\u7740\u5b83\u4eec\u6765\u521b\u5efa\u5b9e\u7528\u7684SQL\u8bed\u53e5\u3002\u4e0d\u8fc7\uff0c\u4f60\u53ef\u4ee5\u5229\u7528\u81ea\u5df1\u638c\u63e1\u7684Access\u77e5\u8bc6\u4ee5\u53ca\u76f8\u5e94\u7684Access\u6280\u80fd\uff0c\u518d\u52a0\u4e0a\u6211\u4eec\u7684\u63d0\u793a\u548c\u6280\u5de7\uff0c\u76f8\u4fe1\u4e00\u5b9a\u80fd\u6210\u529f\u5730\u5728\u4f60\u7684ASP\u7f51\u9875\u4e2d\u52a0\u5165SQL\u3002<\/p>\n
1. SELECT \u8bed\u53e5<\/p>\n
\u5728SQL\u7684\u4e16\u754c\u91cc\uff0c\u6700\u6700\u57fa\u7840\u7684\u64cd\u4f5c\u5c31\u662fSELECT \u8bed\u53e5\u4e86\u3002\u5728\u6570\u636e\u5e93\u5de5\u5177\u4e0b\u76f4\u63a5\u91c7\u7528SQL\u7684\u65f6\u5019\u5f88\u591a\u4eba\u90fd\u4f1a\u719f\u6089\u4e0b\u9762\u7684\u64cd\u4f5c\uff1a
\nSELECT what
\nFROM whichTable
\nWHERE criteria<\/p>\n
\u6267\u884c\u4ee5\u4e0a\u8bed\u53e5\u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u5b58\u653e\u5176\u7ed3\u679c\u7684\u67e5\u8be2\u3002<\/p>\n
\u800c\u5728ASP\u9875\u9762\u6587\u4ef6\u4e0a\uff0c\u4f60\u4e5f\u53ef\u4ee5\u91c7\u7528\u4ee5\u4e0a\u7684\u4e00\u822c\u8bed\u6cd5\uff0c\u4e0d\u8fc7\u60c5\u51b5\u7a0d\u5fae\u4e0d\u540c\uff0cASP\u7f16\u7a0b\u7684\u65f6\u5019\uff0cSELECT \u8bed\u53e5\u7684\u5185\u5bb9\u8981\u4f5c\u4e3a\u5b57\u7b26\u4e32\u8d4b\u7ed9\u4e00\u4e2a\u53d8\u91cf\uff1a
\nSQL = "SELECT what FROM whichTable WHERE criteria"<\/p>\n
\u597d\u4e86\uff0c\u660e\u767d\u4e86ASP\u4e0bSQL\u201c\u8bf4\u8bdd\u201d\u7684\u65b9\u5f0f\uff0c\u63a5\u4e0b\u6765\u5982\u6cd5\u70ae\u5236\u5373\u53ef\uff0c\u53ea\u8981\u6ee1\u8db3\u4f60\u7684\u9700\u8981\uff0c\u4f20\u7edf\u7684SQL\u67e5\u8be2\u6a21\u5f0f\u548c\u6761\u4ef6\u67e5\u8be2\u90fd\u80fd\u6d3e\u7528\u573a\u3002<\/p>\n
\u4e3e\u4f8b\u8bf4\u660e\uff0c\u4e0d\u59a8\u5047\u8bbe\u4f60\u7684\u6570\u636e\u5e93\u5185\u6709\u4e2a\u6570\u636e\u8868\uff0c\u540d\u5b57\u662fProducts \uff0c\u73b0\u5728\u4f60\u60f3\u53d6\u51fa\u8fd9\u4e2a\u8868\u91cc\u7684\u5168\u90e8\u8bb0\u5f55\u3002\u7136\u540e\u4f60\u5c31\u7f16\u5199\u4e86\u4e0b\u9762\u7684\u4ee3\u7801\uff1a
\nSQL ="SELECT * FROM Products"<\/p>\n
\u4ee5\u4e0a\u4ee3\u7801\u2014\u2014SQL\u8bed\u53e5\u7684\u4f5c\u7528\u5c31\u662f\u53d6\u51fa\u8868\u5185\u7684\u5168\u90e8\u6570\u636e\u2014\u2014\u6267\u884c\u540e\u5c06\u4f1a\u9009\u51fa\u6570\u636e\u8868\u5185\u7684\u5168\u90e8\u8bb0\u5f55\u3002\u4e0d\u8fc7\uff0c\u8981\u662f\u53ea\u60f3\u4ece\u8868\u5185\u53d6\u51fa\u67d0\u4e2a\u7279\u5b9a\u5217\uff0c\u6bd4\u5982p_name\u3002\u90a3\u5c31\u4e0d\u80fd\u7528 * \u901a\u914d\u7b26\u4e86\uff0c\u8fd9\u91cc\u5f97\u952e\u5165\u5177\u4f53\u67d0\u5217\u7684\u540d\u5b57\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a
\nSQL ="SELECT p_name FROM Products"<\/p>\n
\u6267\u884c\u4ee5\u4e0a\u67e5\u8be2\u4e4b\u540eProducts \u8868\u5185\u3001p_name \u5217\u7684\u5185\u5bb9\u5c31\u4f1a\u5168\u88ab\u9009\u53d6\u51fa\u6765\u3002<\/p>\n
2. \u7528WHERE\u5b50\u53e5\u8bbe\u7f6e\u67e5\u8be2\u6761\u4ef6<\/p>\n
\u6709\u7684\u65f6\u5019\u53d6\u51fa\u5168\u90e8\u6570\u636e\u5e93\u8bb0\u5f55\u4e5f\u8bb8\u6b63\u597d\u6ee1\u8db3\u4f60\u7684\u8981\u6c42\uff0c\u4e0d\u8fc7\uff0c\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u6211\u4eec\u901a\u5e38\u53ea\u9700\u5f97\u5230\u90e8\u5206\u8bb0\u5f55\u3002\u8fd9\u6837\u4e00\u6765\u8be5\u5982\u4f55\u8bbe\u8ba1\u67e5\u8be2\u5462\uff1f\u5f53\u7136\u4f1a\u66f4\u8d39\u70b9\u8111\u7b4b\u4e86\uff0c\u4f55\u51b5\u672c\u6587\u4e5f\u5b58\u5fc3\u4e0d\u60f3\u8ba9\u4f60\u53bb\u7528\u90a3\u4e2a\u4ec0\u4e48\u52b3\u4ec0\u5b50\u7684recordset\u3002<\/p>\n
\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5047\u5982\u4f60\u53ea\u6253\u7b97\u53d6\u51fap_name \u8bb0\u5f55\uff0c\u800c\u4e14\u8fd9\u4e9b\u8bb0\u5f55\u7684\u540d\u5b57\u5fc5\u987b\u4ee5\u5b57\u6bcdw\u6253\u5934\uff0c\u90a3\u4e48\u4f60\u5c31\u8981\u7528\u5230\u4e0b\u9762\u7684WHERE \u5b50\u53e5\u4e86\uff1a
\nSQL ="SELECT p_name FROM Products WHERE p_name LIKE 'W%'"<\/p>\n
WHERE \u5173\u952e\u8bcd\u7684\u540e\u9762\u8ddf\u7740\u7528\u6765\u8fc7\u6ee4\u6570\u636e\u7684\u6761\u4ef6\uff0c\u6709\u4e86\u8fd9\u4e9b\u6761\u4ef6\u7684\u5e2e\u52a9\uff0c\u53ea\u6709\u6ee1\u8db3\u4e00\u5b9a\u6807\u51c6\u7684\u6570\u636e\u624d\u4f1a\u88ab\u67e5\u8be2\u51fa\u6765\u3002\u5728\u4ee5\u4e0a\u7684\u4f8b\u5b50\u91cc\uff0c\u67e5\u8be2\u7684\u7ed3\u679c\u53ea\u4f1a\u5f97\u5230\u540d\u5b57\u4ee5w \u6253\u5934\u7684p_name \u8bb0\u5f55\u3002<\/p>\n
\u4ee5\u4e0a\u4f8b\u5b50\u4e2d\uff0c\u767e\u5206\u6bd4\u7b26\u53f7\uff08%\uff09\u7684\u542b\u4e49\u662f\u6307\u793a\u67e5\u8be2\u8fd4\u56de\u6240\u6709w \u5b57\u6bcd\u6253\u5934\u800c\u4e14\u540e\u9762\u662f\u4efb\u4f55\u6570\u636e\u751a\u81f3\u6ca1\u6709\u6570\u636e\u7684\u8bb0\u5f55\u6761\u76ee\u3002\u6240\u4ee5\uff0c\u5728\u6267\u884c\u4ee5\u4e0a\u67e5\u8be2\u7684\u65f6\u5019\uff0c west \u548c willow \u5c31\u4f1a\u4eceProducts \u8868\u5185\u88ab\u9009\u53d6\u51fa\u6765\u5e76\u5b58\u653e\u5728\u67e5\u8be2\u91cc\u3002<\/p>\n
\u5c31\u50cf\u4f60\u770b\u5230\u7684\u90a3\u6837\uff0c\u53ea\u8981\u4ed4\u7ec6\u5730\u8bbe\u8ba1SELECT \u8bed\u53e5\uff0c\u4f60\u5c31\u53ef\u4ee5\u9650\u5236recordset \u4e2d\u8fd4\u56de\u7684\u4fe1\u606f\u91cf\uff0c\u591a\u7422\u78e8\u7422\u78e8\u603b\u80fd\u6ee1\u8db3\u4f60\u7684\u8981\u6c42\u3002<\/p>\n
\u8fd9\u4e9b\u554a\u8fd8\u4e0d\u8fc7\u662f\u638c\u63e1SQL\u7528\u9014\u521a\u8d77\u6b65\u3002\u4e3a\u4e86\u5e2e\u52a9\u4f60\u9010\u6b65\u638c\u63e1\u590d\u6742\u7684SELECT \u8bed\u53e5\u7528\u6cd5\uff0c\u4e0b\u9762\u5c31\u8ba9\u6211\u4eec\u518d\u6765\u770b\u4e00\u4e0b\u5173\u952e\u7684\u6807\u51c6\u672f\u8bed\uff1a\u6bd4\u8f83\u8fd0\u7b97\u7b26\uff0c\u8fd9\u4e9b\u73a9\u610f\u90fd\u662f\u4f60\u5728\u6784\u7b51\u81ea\u5df1\u7684SELECT \u5b57\u7b26\u4e32\u6765\u83b7\u5f97\u7279\u5b9a\u6570\u636e\u65f6\u8981\u7ecf\u5e38\u7528\u5230\u7684\u3002<\/p>\n
WHERE\u5b50\u53e5\u57fa\u7840
\n\u5728\u5f00\u59cb\u521b\u5efaWHERE \u5b50\u53e5\u7684\u65f6\u5019\uff0c\u6700\u7b80\u5355\u7684\u65b9\u5f0f\u662f\u91c7\u7528\u6807\u51c6\u7684\u6bd4\u8f83\u7b26\u53f7\uff0c\u5b83\u4eec\u662f < \u3001 <= \u3001 > \u3001 >= \u3001<> \u548c =\u3002\u663e\u7136\uff0c\u4f60\u5f88\u5feb\u5c31\u80fd\u660e\u767d\u4ee5\u4e0b\u4ee3\u7801\u7684\u542b\u4e49\u548c\u5177\u4f53\u8fd0\u884c\u7ed3\u679c\uff1a
\nSELECT * FROM Products WHERE p_price >= 199.95
\nSELECT * FROM Products WHERE p_price <> 19.95
\nSELECT * FROM Products WHERE p_version = '4'<\/p>\n
\u6ce8\u610f\uff1a \u8fd9\u91cc\u4f60\u4f1a\u6ce8\u610f\u5230\uff0c\u6700\u540e\u4e00\u4e2a\u4f8b\u53e5\u4e2d\u7684\u6570\u5b574\u5468\u56f4\u52a0\u4e86\u5355\u5f15\u53f7\u3002\u539f\u56e0\u662f\u8fd9\u6837\u7684\uff0c\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\u7684 '4' \u662f\u6587\u672c\u7c7b\u578b\u800c\u975e\u6570\u5b57\u7c7b\u578b\u3002\u56e0\u4e3a\u4f60\u4f1a\u628a SELECT \u8bed\u53e5\u653e\u5230\u5f15\u53f7\u4e2d\u6765\u628a\u5b83\u4f5c\u4e3a\u4e00\u4e2a\u503c\u8d4b\u7ed9\u53d8\u91cf\uff0c\u6240\u4ee5\u4f60\u4e5f\u53ef\u4ee5\u5728\u8bed\u53e5\u4e2d\u91c7\u7528\u5f15\u53f7\u3002<\/p>\n
\u6bd4\u8f83\u8fd0\u7b97\u7b26<\/p>\n
\u6bd4\u8f83\u8fd0\u7b97\u7b26\u6307\u5b9a\u4ece\u8868\u5185\u53d6\u51fa\u6570\u636e\u7684\u5185\u5bb9\u8303\u56f4\u3002\u4f60\u53ef\u4ee5\u7528\u5b83\u4eec\u6765\u521b\u5efa\u8fc7\u6ee4\u5668\u4ee5\u4fbf\u7f29\u5c0frecordset\u7684\u8303\u56f4\uff0c\u4fc3\u4f7f\u5176\u53ea\u4fdd\u5b58\u7ed9\u5b9a\u4efb\u52a1\u4e0b\u4f60\u5173\u5fc3\u7684\u4fe1\u606f\u3002<\/p>\n
3. LIKE \u3001 NOT LIKE\u548c BETWEEN<\/p>\n
\u4f60\u5df2\u7ecf\u5728\u4e0a\u9762\u53d6\u51faw\u6253\u5934\u8bb0\u5f55\u7684\u4f8b\u5b50\u4e2d\u770b\u5230\u4e86LIKE\u7684\u7528\u6cd5\u3002LIKE\u5224\u5b9a\u8bcd\u662f\u4e00\u4e2a\u975e\u5e38\u6709\u7528\u7684\u7b26\u53f7\u3002\u4e0d\u8fc7\uff0c\u5728\u5f88\u591a\u60c5\u51b5\u4e0b\u7528\u4e86\u5b83\u53ef\u80fd\u4f1a\u5e26\u7ed9\u4f60\u592a\u591a\u7684\u6570\u636e\uff0c\u6240\u4ee5\u5728\u7528\u5230\u5b83\u4e4b\u524d\u6700\u597d\u5148\u5f00\u52a8\u8111\u7b4b\u591a\u60f3\u60f3\u81ea\u5df1\u5230\u5e95\u60f3\u83b7\u5f97\u4ec0\u4e48\u6570\u636e\u3002\u5047\u8bbe\u4f60\u60f3\u53d6\u51fa5\u4f4d\u6570\u5b57\u7684SKU\u53f7\u7801\uff0c\u800c\u4e14\u5176\u5f00\u5934\u662f1\u7ed3\u5c3e\u662f5\uff0c\u90a3\u4e48\u4f60\u53ef\u4ee5\u7528\u4e0b\u5212\u7b26\uff08_\uff09\u4ee3\u66ff%\u7b26\u53f7\uff1a
\nSQL = "SELECT * FROM Products WHERE p_sku LIKE '1___5'"<\/p>\n
\u4e0b\u5212\u7b26\u8868\u793a\u4efb\u610f\u4e00\u4e2a\u5b57\u7b26\u3002\u6240\u4ee5\u5728\u8f93\u5165\u201c1 _ _ _ 5\u201d\u7684\u60c5\u51b5\u4e0b\uff0c\u4f60\u7684\u641c\u7d22\u5c31\u4f1a\u9650\u5236\u5728\u6ee1\u8db3\u7279\u5b9a\u6a21\u5f0f\u76845\u4f4d\u6570\u8303\u56f4\u5185\u4e86\u3002<\/p>\n
\u5047\u5982\u4f60\u60f3\u53cd\u5176\u9053\u800c\u884c\u4e4b\uff0c\u8981\u627e\u51fa\u6240\u6709\u4e0d\u5339\u914d\u201c1_ _ _ 5\u201d\u6a21\u5f0f\u7684SKU\u6761\u76ee\u3002\u90a3\u4e48\u4f60\u53ea\u9700\u8981\u5728\u521a\u624d\u8bed\u53e5\u4f8b\u5b50\u4e2d\u7684LIKE\u524d\u9762\u52a0\u4e0aNOT\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n
BETWEEN
\n\u5047\u8bbe\u4f60\u60f3\u53d6\u51fa\u4e00\u5b9a\u8303\u56f4\u5185\u7684\u6570\u636e\uff0c\u800c\u4e14\u4f60\u4e8b\u5148\u77e5\u9053\u8303\u56f4\u7684\u8d77\u70b9\u548c\u7ec8\u70b9\uff0c\u90a3\u4e48\u4f60\u4e0d\u59a8\u91c7\u7528BETWEEN \u5224\u65ad\u8bcd\u3002\u73b0\u5728\u5c31\u8ba9\u6211\u4eec\u5047\u8bbe\u4f60\u60f3\u9009\u53d6\u7ed9\u5b9a\u8868\u5185\u8303\u56f4\u5728 1\u548c 10\u4e4b\u95f4\u7684\u8bb0\u5f55\u3002\u4f60\u53ef\u4ee5\u5982\u4e0b\u4f7f\u7528BETWEEN\uff1a
\n\u2026WHERE ID BETWEEN 1 AND 10<\/p>\n
\u6216\u8005\u4f60\u4e5f\u53ef\u4ee5\u91c7\u7528\u5df2\u7ecf\u719f\u6089\u7684\u6570\u5b66\u5224\u65ad\u5b57\u53e5\uff1a
\n\u2026WHERE ID >= 1 AND ID >= 10<\/p>\n
4. \u8054\u5408\u8bed\u53e5<\/p>\n
\u6211\u4eec\u5230\u76ee\u524d\u4e3a\u6b62\u6240\u8c08\u5230\u7684SQL\u8bed\u53e5\u76f8\u5bf9\u8f83\u4e3a\u7b80\u5355\uff0c\u5982\u679c\u518d\u80fd\u901a\u8fc7\u6807\u51c6\u7684recordset\u5faa\u73af\u67e5\u8be2\uff0c\u90a3\u4e48\u8fd9\u4e9b\u8bed\u53e5\u4e5f\u80fd\u6ee1\u8db3\u4e00\u4e9b\u66f4\u590d\u6742\u7684\u8981\u6c42\u3002\u4e0d\u8fc7\uff0c\u4f55\u5fc5\u975e\u8981\u62d8\u6ce5\u5728\u6d45\u5c1d\u5219\u6b62\u7684\u57fa\u7840\u6c34\u51c6\u4e4b\u4e0a\u5462\uff1f\u4f60\u5b8c\u5168\u53ef\u4ee5\u518d\u589e\u52a0\u5176\u4ed6\u4e00\u4e9b\u7b26\u53f7\uff0c\u6bd4\u5982AND\u3001 OR\u548cNOT\u6765\u5b8c\u6210\u66f4\u5f3a\u5927\u7684\u529f\u80fd\u3002<\/p>\n
\u4ee5\u4e0b\u9762\u7684SQL\u8bed\u53e5\u4e3a\u4f8b\uff1a
\nSQL ="SELECT c_firstname, c_lastname, c_email FROM customers WHERE c_email IS
\nNOT NULL AND c_purchase = '1' OR c_purchase = '2' AND c_lastname LIKE
\n'A%'"<\/p>\n
\u5c31\u4f60\u76ee\u524d\u6240\u638c\u63e1\u7684SQL\u77e5\u8bc6\uff0c\u4ee5\u4e0a\u7684\u4f8b\u5b50\u4e5f\u4e0d\u96be\u89e3\u91ca\uff0c\u4e0d\u8fc7\u4e0a\u9762\u7684\u8bed\u53e5\u5e76\u6ca1\u6709\u5f88\u660e\u767d\u5730\u8ba9\u4f60\u770b\u6e05\u6761\u4ef6\u5b57\u53e5\u662f\u5982\u4f55\u80f6\u5408\u5728\u5355\u4e00SQL\u8bed\u53e5\u4e2d\u7684\u3002<\/p>\n
\u591a\u884c\u8bed\u53e5
\n\u5728SQL\u8bed\u53e5\u4e0d\u597d\u61c2\u7684\u60c5\u51b5\u4e0b\uff0c\u4f60\u4e0d\u59a8\u628a\u6574\u4e2a\u8bed\u53e5\u5206\u89e3\u4e3a\u591a\u884c\u4ee3\u7801\uff0c\u7136\u540e\u5728\u73b0\u6709\u53d8\u91cf\u57fa\u7840\u4e0a\u9010\u6b65\u589e\u52a0\u67e5\u8be2\u8bed\u53e5\u7684\u5404\u4e2a\u7ec4\u6210\u90e8\u5206\u5e76\u628a\u5b83\u5b58\u5728\u540c\u4e00\u53d8\u91cf\u5185\uff1a
\nSQL = "SELECT c_firstname, c_lastname, c_emailaddress, c_phone"
\nSQL = SQL & " FROM customers"
\nSQL = SQL & " WHERE c_firstname LIKE 'A%' and c_emailaddress NOT NULL"
\nSQL = SQL & " ORDER BY c_lastname, c_firstname"
\n\u5230\u4e86\u6700\u540e\u4e00\u53e5\uff0cSQL\u53d8\u91cf\u5c31\u5305\u542b\u4e86\u4ee5\u4e0b\u7684\u5b8c\u6574SELECT \u8bed\u53e5\uff1a
\n"SELECT c_firstname, c_lastname, c_emailaddress, c_phone FROM customers
\nWHERE c_firstname LIKE 'A%' and c_emailaddress NO NULL ORDER BY c_lastname,
\nc_firstname"<\/p>\n
\u6574\u53e5\u7167\u4e0a\u9762\u5206\u89e3\u4e4b\u540e\u663e\u7136\u597d\u8bfb\u591a\u4e86\uff01\u5728\u8fdb\u884c\u8c03\u8bd5\u7684\u65f6\u5019\uff0c\u4f60\u6216\u8bb8\u66f4\u4e50\u4e8e\u591a\u6572\u51e0\u4e2a\u5b57\u7b26\u628a\u7a0b\u5e8f\u6539\u5f97\u66f4\u597d\u8bfb\u4e9b\u3002\u4e0d\u8fc7\u4f60\u53ef\u8981\u8bb0\u4f4f\u4e86\uff0c\u5728\u5c01\u95ed\u5f15\u53f7\u4e4b\u524d\u6216\u8005\u5728\u6253\u5f00\u5f15\u53f7\u4e4b\u540e\u4f60\u9700\u8981\u589e\u52a0\u7a7a\u683c\uff0c\u8fd9\u6837\u624d\u80fd\u4fdd\u8bc1\u5b57\u7b26\u4e32\u8fde\u63a5\u8d77\u6765\u7684\u65f6\u5019\u4f60\u6ca1\u6709\u628a\u51e0\u4e2a\u8bcd\u51d1\u5230\u4e86\u4e00\u5757\u3002
\n5. \u5f00\u59cb\u6267\u884c<\/p>\n
\u5728\u5b66\u4f1a\u4e86SELECT\u8bed\u53e5\u7684\u6784\u9020\u548c\u7528\u9014\u4e4b\u540e\u4f60\u5c31\u8be5\u5b66\u4e60\u5982\u4f55\u4f7f\u7528\u5b83\u4e86\u3002\u5728\u4f60\u6240\u638c\u63e1\u7684\u6570\u636e\u5e93\u5de5\u5177\u4e0b\uff0c\u8fd9\u53ef\u80fd\u610f\u5473\u7740\u4f60\u5f97\u6309\u4e0b\u67d0\u4e2a\u5199\u7740\u201c\u6267\u884c\u201d\u5b57\u6837\u7684\u6309\u94ae\u3002\u5728ASP\u7f51\u9875\u4e0a\uff0c\u53ef\u4ee5\u7acb\u5373\u6267\u884cSQL\u8bed\u53e5\u4e5f\u53ef\u4ee5\u5f53\u4f5c\u5b58\u50a8\u8fc7\u7a0b\u8c03\u7528\u3002<\/p>\n
\u4e00\u65e6\u521b\u5efa\u4e86SQL \u8bed\u53e5\uff0c\u4f60\u8fd8\u5f97\u8bbe\u6cd5\u8bbf\u95ee\u5176\u67e5\u8be2\u7ed3\u679c\u3002\u663e\u7136\uff0c\u8fd9\u91cc\u7684\u5173\u952e\u5c31\u662fASP recordset\u3002\u5728\u4f7f\u7528\u975eSQL\u7684recordset\u65f6\uff0c\u521b\u5efarecordset\u7684\u4ee3\u7801\u901a\u5e38\u5982\u4e0b\u6240\u793a\uff1a
\nDim objRec
\nSet objRec = Server.CreateObject ("ADODB.Recordset")
\nobjRec.Open "customers", objConn, 0, 1, 2<\/p>\n
\u5982\u679c\u4f60\u5bf9ASP\u6bd4\u8f83\u719f\u6089\u4ee5\u4e0a\u7684\u4ee3\u7801\u5bf9\u4f60\u53ef\u5c31\u4e0d\u964c\u751f\u4e86\uff0c\u4f60\u5e94\u8be5\u77e5\u9053\u201ccustomers\u201d\u8868\u793a\u4f60\u6253\u5f00\u6570\u636e\u5e93\u5185\u4e00\u4e2a\u6570\u636e\u8868\u7684\u540d\u5b57\u3002<\/p>\n
\u6253\u5f00recordset
\n\u4e3a\u4e86\u5145\u5206\u5229\u7528\u4f60\u66f4\u4e3a\u719f\u6089\u7684SQL\u6280\u80fd\uff0c\u4f60\u9700\u8981\u8c03\u6574\u5e38\u89c4ASP\u7f51\u9875\u4e0a\u6700\u5e38\u91c7\u7528\u7684recordset\uff1a
\nDim objRec
\nSet objRec = Server.CreateObject ("ADODB.Recordset")
\nobjRec.Open SQL, objConn, 0, 1, 2<\/p>\n
\u8fd9\u91cc\u552f\u4e00\u7684\u4fee\u6539\u5c31\u662f\u5728objRec.Open,\u4e4b\u540e\u7528\u5305\u542bSQL\u8bed\u53e5\u7684\u53d8\u91cf\u4ee3\u66ff\u4e86\u8981\u67e5\u8be2\u7684\u6570\u636e\u8868\u7684\u540d\u79f0\u3002<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u4e4b\u4e00\u662f\u4f60\u53ef\u4ee5\u6307\u5b9a\u6e38\u6807\u7c7b\u578b\uff08\u5982\u4ee5\u4e0a0, 1 ,2 \u6240\u793a\uff09\u3002<\/p>\n
\u6267\u884cSQL
\n\u4f60\u53ef\u4ee5\u7528\u7d27\u51d1\u7684\u4e00\u884c\u4ee3\u7801\u6267\u884cSQL\u8bed\u53e5\u6765\u521b\u5efarecordset\u3002\u4ee5\u4e0b\u662f\u8bed\u6cd5\uff1a
\nDim objRec
\nset objRec = objConn.Execute(SQL)<\/p>\n
\u5728\u4e0a\u4f8b\u4e2d\uff0c\u4f60\u6240\u770b\u5230\u7684SQL\u662f\u4f60\u5b58\u653e\u81ea\u5df1SQL SELECT \u8bed\u53e5\u7684\u53d8\u91cf\u3002\u8be5\u4ee3\u7801\u884c\u201c\u8fd0\u884c\u201dSQL\u8bed\u53e5\uff08\u6216\u8005\u8bf4\u5bf9\u6570\u636e\u5e93\u8fdb\u884c\u67e5\u8be2\uff09\uff0c\u9009\u53d6\u6570\u636e\u5e76\u628a\u6570\u636e\u5b58\u653e\u5728recordset \u5185\uff0c\u5728\u4e0a\u4f8b\u4e2d\u5c31\u662f\u53d8\u91cfobjRec\u3002\u8fd9\u79cd\u65b9\u6cd5\u7684\u4e3b\u8981\u7f3a\u70b9\u662f\u4f60\u4e0d\u80fd\u9009\u62e9\u81ea\u5df1\u60f3\u91c7\u7528\u7684\u6e38\u6807\u7c7b\u578b\u3002\u76f8\u53cd\uff0crecordset\u603b\u662f\u7528\u524d\u5411\u6e38\u6807\u6253\u5f00\u3002<\/p>\n
\u56e0\u4e3a\u6e38\u6807\u7684\u7f18\u6545\uff0c\u4f60\u6216\u8bb8\u6253\u7b97\u719f\u6089\u4e24\u79cd\u521b\u5efarecordset\u7684\u65b9\u6cd5\u3002\u76f4\u63a5\u6267\u884c\u67e5\u8be2\u8282\u7701\u4e86\u952e\u5165\u5b57\u7b26\u6240\u6d88\u8017\u7684\u65f6\u95f4\uff0c\u4f46\u90a3\u6837\u7684\u8bdd\u4f60\u5c31\u5f97\u91c7\u7528\u9ed8\u8ba4\u7684\u6e38\u6807\u4e86\uff0c\u8fd9\u6837\u6709\u53ef\u80fd\u906d\u9047\u7ecf\u5e38\u4e0d\u80fd\u6b63\u5e38\u8fd0\u884c\u7684\u6bdb\u75c5\u3002\u4e0d\u7ba1\u4f60\u5177\u4f53\u91c7\u7528\u54ea\u79cd\u529e\u6cd5\uff0c\u4e24\u8005\u4e4b\u95f4\u7684\u6700\u5927\u7684\u5dee\u522b\u4e5f\u4e0d\u5916\u4e4e\u4ee3\u7801\u7cbe\u7ec3\u4e0e\u5426\u3002\u5728\u4e0d\u8003\u8651\u4f60\u53d6\u5f97\u4ec0\u4e48\u5b57\u6bb5\u3001\u4f60\u7684\u6807\u51c6\u662f\u4ec0\u4e48\u7684\u524d\u63d0\u4e0b\uff0c\u4e5f\u4e0d\u7ba1\u4f60\u5982\u4f55\u5b58\u50a8\u6570\u636e\uff0c\u91c7\u7528SQL\u5f0f\u7684recordset \u5728\u4f53\u79ef\u4e0a\u4f1a\u6bd4ASP\u4e0a\u6253\u5f00\u7684\u6807\u51c6recordset \u8981\u5c0f\u5f97\u591a\uff0c\u66f4\u522b\u63d0\u64cd\u4f5c\u8d77\u6765\u7684\u7b80\u6613\u6027\u4e86\u3002\u6bd5\u7adf\uff0c\u901a\u8fc7\u8fc7\u6ee4\u6570\u636e\uff0c\u4f60\u6d88\u9664\u4e86\u8017\u8d39\u65f6\u95f4\u7684if-then \u6d4b\u8bd5\u548c\u53ef\u80fd\u7528\u5230\u7684\u5faa\u73af\u3002<\/p>\n
\u7f16\u5199\u6d4b\u8bd5\u7528SQL
\n\u8fd9\u91cc\u6709\u4e2a\u6280\u5de7\uff0c\u8bb8\u591a\u4e13\u4e1aASP\u7a0b\u5e8f\u5458\u4e60\u60ef\u5728\u6d4b\u8bd5\u7f51\u9875\u7684\u65f6\u5019\u201c\u7f16\u5199\u201d\u81ea\u5df1\u7684SQL\u8bed\u53e5\u3002\u8fd9\u6837\u505a\u53ef\u4ee5\u5e2e\u52a9\u4f60\u8c03\u8bd5\u4ee3\u7801\uff0c\u56e0\u4e3a\u4f60\u53ef\u4ee5\u4ece\u4e2d\u770b\u5230\u4f20\u9012\u7ed9\u670d\u52a1\u5668\u6267\u884c\u7684\u5b57\u7b26\u4e32\u3002\u800c\u4f60\u8981\u505a\u7684\u65e0\u975e\u662f\u589e\u52a0Response.WriteyourVariable \u5728\u5c4f\u5e55\u4e0a\u663e\u793a\u6709\u5173\u4fe1\u606f\u3002\u5728\u4f60\u628a\u548cSQL\u6709\u5173\u7684\u95ee\u9898\u63d0\u4ea4\u7ed9ASP\u8ba8\u8bba\u7ec4\u7684\u65f6\u5019\u4f60\u5c31\u5e94\u8be5\u9644\u4e0a\u8fd9\u4e9b\u4fe1\u606f\u3002<\/p>\n
6. \u5b58\u50a8\u67e5\u8be2<\/p>\n
\u5f53\u4f60\u7684\u67e5\u8be2\u76f8\u5bf9\u7b80\u5355\u7684\u65f6\u5019\uff0c\u6bcf\u6b21\u4ece\u5934\u5f00\u59cb\u521b\u5efaSQL\u8bed\u53e5\u4e5f\u4e0d\u8d39\u4ec0\u4e48\u5de5\u592b\uff0c\u4e0d\u8fc7\uff0c\u590d\u6742\u7684\u67e5\u8be2\u5c31\u4e0d\u540c\u4e86\uff0c\u6bcf\u6b21\u90fd\u4ece\u5934\u6765\u4f1a\u4ea7\u751f\u5f88\u591a\u5f00\u53d1\u9519\u8bef\u3002\u56e0\u6b64\uff0c\u4e00\u65e6\u8ba9SQL\u987a\u5229\u5730\u8fd0\u884c\u8d77\u6765\uff0c\u4f60\u6700\u597d\u628a\u5b83\u4eec\u5b58\u8d77\u6765\uff0c\u5728\u9700\u8981\u65f6\u518d\u8c03\u7528\u5b83\u4eec\u3002\u8fd9\u6837\uff0c\u54ea\u6015\u662f\u4e00\u4e2a\u7b80\u5355\u67e5\u8be2\u4f60\u90fd\u80fd\u968f\u65f6\u7528\u4e0a\u5b58\u50a8\u7684\u67e5\u8be2\u8bed\u53e5\u4e86\u3002<\/p>\n
\u5047\u8bbe\u4f60\u6bcf\u5468\u90fd\u8981\u7ed9\u56e2\u961f\u505a\u4e00\u6b21\u62a5\u544a\uff0c\u6307\u51fa\u76ee\u524d\u5b58\u5728\u7684\u4e1a\u52a1\u652f\u6301\u95ee\u9898\uff0c\u8fd9\u4e9b\u6570\u636e\u9700\u8981\u4ece\u4f60\u7684\u6570\u636e\u5e93\u4e2d\u9009\u53d6\uff0c\u800c\u4e14\u8981\u6309\u7167\u65e5\u671f\u9009\u62e9\u8bb0\u5f55\uff0c\u540c\u65f6\u6839\u636e\u4f60\u6240\u5728\u56e2\u961f\u6240\u91c7\u7528\u7684\u652f\u6301\u95ee\u9898\u7684\u7c7b\u522b\u6392\u5e8f\u3002\u4e00\u65e6\u4f60\u8bbe\u8ba1\u4e86\u8fd9\u4e00\u67e5\u8be2\uff0c\u4f60\u4f55\u5fc5\u4ee5\u540e\u6bcf\u5468\u90fd\u91cd\u65b0\u7f16\u5199\u4e00\u6b21\u5462\uff1f\u4e0d\u8981\u5728\u4f60\u7684HTML\u9875\u9762\u4e0a\u521b\u5efa\u67e5\u8be2\uff0c\u4f60\u5e94\u8be5\u7528\u4f60\u7684\u6570\u636e\u5e93\u5de5\u5177\u521b\u5efa\u67e5\u8be2\u5e76\u4e14\u4fdd\u5b58\u5b83\u3002<\/p>\n
\u7136\u540e\u4f60\u53ef\u4ee5\u91c7\u7528ActiveCommand \u5c5e\u6027\u628a\u67e5\u8be2\u63d2\u5165\u5230\u4f60\u7684ASP\u7f51\u9875\u3002\u5934\u4e00\u4e24\u56de\u4f60\u53ef\u80fd\u4f1a\u89c9\u5f97\u6ca1\u5565\u610f\u601d\uff0c\u5176\u5b9e\u4e5f\u5c31\u51e0\u884c\u4ee3\u7801\u800c\u5df2\uff1a
\nSet objSQ = Server.CreateObject ("ADODB.Command")
\nobjSQ.ActiveConnection = "databaseName"<\/p>\n
objSQ.CommandText = "storedQueryName"
\nobjSQ.CommandType = adCmdStoredProc<\/p>\n
set objRec = objSQ.Execute<\/p>\n
\u6ce8\u610f\uff0c\u91c7\u7528adCmdStoredProc \u8868\u793a\u4f60\u5df2\u7ecf\u5728\u9875\u9762\u4e0a\u5305\u542b\u4e86adovbs.inc \u6587\u4ef6\u3002\u8be5\u6587\u4ef6\u5b9a\u4e49\u4e86\u4f60\u53ef\u4ee5\u6309\u7167\u540d\u5b57\u800c\u975e\u6570\u5b57\u8fdb\u884c\u8bbf\u95ee\u7684Access\u5e38\u6570\u3002\u53ea\u9700\u8981\u5728\u9875\u9762\u4e0a\u5305\u542b\u8be5\u6587\u4ef6\u5373\u53ef\uff08<!–#INCLUDE –>\uff09\uff0c\u7136\u540e\u4f60\u5c31\u53ef\u4ee5\u7528adCmdStoredProc \u8fd9\u7c7b\u540d\u5b57\u4e86\u3002\u8fd9\u6837\uff0c\u5c06\u6765\u4f60\u518d\u770b\u5230\u7684\u65f6\u5019\u66f4\u5bb9\u6613\u7406\u89e3\u4ee5\u4e0a\u88ab\u5b58\u50a8\u7684\u67e5\u8be2\u5230\u5e95\u662f\u4e2a\u4ec0\u4e48\u610f\u601d\u3002<\/p>\n
7. ORDER BY<\/p>\n
\u4eceAccess\u6570\u636e\u5e93\u4e2d\u9009\u53d6\u8bb0\u5f55\u6709\u4ef6\u6700\u4ee4\u4eba\u4e27\u6c14\u7684\u4e8b\u60c5\uff0c\u5b83\u4eec\u662f\u4ee5\u600e\u6837\u7684\u987a\u5e8f\u8f93\u5165\u5230\u6570\u636e\u5e93\u5185\u5c31\u6309\u7167\u600e\u6837\u7684\u987a\u5e8f\u51fa\u6765\u3002\u5c31\u7b97\u4f60\u5728Access\u73af\u5883\u5185\u91c7\u7528Sort By\u6765\u6539\u53d8\u8bb0\u5f55\u89c6\u56fe\uff0c\u6570\u636e\u8868\u5185\u7684\u8bb0\u5f55\u987a\u5e8f\u4e5f\u5e76\u6ca1\u6709\u53d1\u751f\u6539\u53d8\u3002<\/p>\n
\u5982\u679c\u4f60\u6b63\u5728\u4f7f\u7528ASPrecordset\u5728\u7f51\u9875\u4e0a\u5199\u51fa\u8bb0\u5f55\uff0c\u90a3\u4e48\u4f60\u6216\u8bb8\u77e5\u9053\u4e71\u7eb7\u7eb7\u7684\u987a\u5e8f\u662f\u591a\u4ee4\u4eba\u75db\u82e6\u7684\u4e8b\u3002\u4f46\u662f\u4f60\u53ef\u80fd\u4e0d\u5f97\u4e0d\u7ecf\u5e38\u5f97\u9762\u5bf9\u8fd9\u4e00\u95ee\u9898\uff0c\u56e0\u4e3a\u5e76\u4e0d\u5b58\u5728\u4ec0\u4e48\u7b80\u5355\u65b9\u4fbf\u7684\u89e3\u51b3\u65b9\u6848\u3002\u597d\u5728ORDER BY \u53ef\u4ee5\u7b80\u5316\u8fd9\u4e00\u96be\u9898\u3002<\/p>\n
\u4e3a\u4e86\u5bf9\u4f60\u7684\u7ed3\u679c\u6392\u5e8f\uff0c\u53ea\u8981\u5728SELECT\u8bed\u53e5\u672b\u5c3e\u52a0\u4e0aORDER BY\uff0c\u7136\u540e\u6307\u5b9a\u4f60\u9700\u8981\u6392\u5e8f\u7684\u53c2\u7167\u5217\u5373\u53ef\u3002\u56e0\u6b64\uff0c\u5982\u679c\u4f60\u60f3\u8981\u6839\u636e\u987e\u5ba2\u7684\u59d3\u6c0f\u5bf9Customers\u8868\u6392\u5e8f\uff0c\u90a3\u4e48\u4f60\u53ef\u4ee5\u7f16\u5199\u5982\u4e0b\u7684\u67e5\u8be2\u8bed\u53e5\uff1a
\nSQL = "SELECT c_lastname, c_firstname, c_email FROM Customers ORDER BY c_lastname"<\/p>\n
\u8fd9\u6837\uff0c\u53ea\u8981\u4f60\u5efa\u7acb\u4e86recordset\u800c\u4e14\u5f00\u59cb\u628a\u7ed3\u679c\u5199\u5230\u5c4f\u5e55\u4e0a\uff0c\u4f60\u5c31\u4f1a\u770b\u89c1\u6570\u636e\u6309\u7167\u5b57\u6bcd\u987a\u5e8f\u6392\u5217\u8d77\u6765\u4e86\u3002<\/p>\n
\u591a\u7ea7\u6392\u5e8f
\n\u5176\u5b9e\u4e0d\u4ec5\u4ec5\u53ef\u4ee5\u5728SQL\u8bed\u53e5\u4e2d\u8fdb\u884c\u4e00\u7ea7\u6392\u5e8f\u3002\u5b9e\u9645\u4e0a\uff0c\u5728\u5f88\u591a\u60c5\u51b5\u4e0b\uff0c\u4f60\u53ef\u80fd\u4f1a\u5e0c\u671b\u6307\u5b9a\u4e24\u5230\u4e09\u7ea7\u6df1\u5ea6\u7684\u6570\u636e\u6392\u5e8f\u3002\u5047\u8bbe\u4f60\u6709\u4ee5\u4e0b\u6570\u636e\u8868\uff0c\u5176\u5185\u5bb9\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
\u5148\u524d\u91c7\u7528\u7684\u5355\u7ea7ORDER BY \u6392\u5e8f\u662f\u6309\u4e0b\u9762\u7684\u987a\u5e8f\u53d6\u51fa\u6570\u636e\u7684\uff1a
\nAbsurdly Assured
\nabsurd@assured.com<\/p>\n
Absolutely Assured
\nabsolutely@assured.com<\/p>\n
Crazed Coder
\ncrazy@coder.net<\/p>\n
Loosely Fringe
\nloose@fringe.to<\/p>\n
Lunatic Fringe
\nlune@fringe.to<\/p>\n
Hands On
\nhands@yes.org<\/p>\n
\u663e\u7136ORDER BY \u8d77\u4e86\u5e94\u6709\u7684\u4f5c\u7528\u3002\u5728\u5b9e\u9645\u7684\u8868\u7ed3\u6784\u4e0b\uff0cAbsurdly Assured \u662f\u6700\u540e\u7684\u6761\u76ee\uff0c\u4f46\u5b83\u6392\u5728\u68c0\u7d22\u7ed3\u679c\u7684\u6700\u9876\u7aef\u3002Hands On\u8bb0\u5f55\u6392\u6700\u540e\u56e0\u4e3a O \u5728\u4ee5\u4e0a\u5217\u8868\u4e2d\u6392\u5728\u5b57\u6bcd\u8868\u6700\u540e\u3002\u663e\u7136\uff0cAbsolutely\u6309\u7167\u5b57\u6bcd\u8868\u6700\u597d\u6392\u5728Absurdly\u4e4b\u524d\u3002\u4e3a\u6b64\uff0c\u4f60\u9700\u8981\u91c7\u53d6\u7b2c2\u7ea7ORDER BY \u6392\u5e8f\u6807\u51c6\uff0c\u53c2\u7167\u7b2c2\u5217\u8fdb\u884c\u6392\u5e8f\uff1a
\nSQL = "SELECT c_lastname, c_firstname, c_email FROM Customers ORDER BY
\nc_lastname, c_firstname"<\/p>\n
\u5176\u7ed3\u679c\u5c06\u9996\u5148\u6309\u7167c_lastname \u5217\u6392\u5e8f\u7136\u540e\u6309\u7167c_firstname \u5217\u6392\u5e8f\u3002\u5047\u5982\u4f60\u7684\u6570\u636e\u8868\u5305\u542b\u7684\u8bb0\u5f55\u6bd4\u8f83\u591a\uff0c\u4ed4\u7ec6\u8bbe\u8ba1\u6392\u5e8f\u4f1a\u4ee4\u8f93\u51fa\u7ed3\u679c\u7f16\u6392\u66f4\u4e3a\u5408\u7406\u3002<\/p>\n
\u6295\u5165\u4f7f\u7528
\n\u5982\u679c\u4f60\u540c\u5927\u591a\u6570\u7a0b\u5e8f\u5458\u4e00\u6837\u559c\u6b22\u81ea\u5df1\u52a8\u624b\u7f16\u4ee3\u7801\uff0c\u6c89\u6e4e\u4e8e\u638c\u63e1\u65b0\u6280\u672f\u7684\u72c2\u70ed\u4e4b\u4e2d\u3002\u4f55\u4e0d\u4eceASP\u7684\u5197\u957f\u7f16\u7801\u4e2d\u8f6c\u8fc7\u5934\u6765\u5c1d\u8bd5\u4e00\u4e0bSQL\u7f16\u7801\u5462\uff1f\u4e0b\u9762\u6211\u4eec\u5c06\u5c31ASP\u7f16\u7a0b\u65f6\u5e38\u89c1\u7684\u95ee\u9898\u4ee5\u53ca\u5982\u4f55\u5728ASP\u4e2d\u9ad8\u6548\u5730\u5229\u7528SQL\u8bed\u53e5\u505a\u4e00\u756a\u63a2\u8ba8\u3002<\/p>\n
11. \u8bb0\u5f55\u7edf\u8ba1<\/p>\n
\u786e\u5b9a\u6570\u636e\u5e93\u5185\u6709\u591a\u5c11\u8bb0\u5f55\uff0c\u6216\u8005\u786e\u5b9a\u6709\u591a\u5c11\u8bb0\u5f55\u8fbe\u5230\u4e86\u67d0\u4e9b\u6807\u51c6\uff0c\u8fd9\u4e9b\u7528ASP\u5b8c\u6210\u5e76\u975e\u96be\u4e8b\u3002\u5982\u679c\u4f60\u91c7\u7528\u4e86\u6b63\u786e\u7684\u6e38\u6807\u7c7b\u578b\uff0c\u4f60\u53ef\u4ee5\u7528RecordCount \u5c5e\u6027\u83b7\u5f97\u8bb0\u5f55\u6570\u5f53\u7136\u4e5f\u53ef\u4ee5\u7528recordset\u3002\u4f46\u662f\uff0c\u6709\u4e2a\u66f4\u7b80\u5355\u7684\u529e\u6cd5\uff0c\u8fd9\u5c31\u662f\u5728\u81ea\u5df1\u7684SELECT\u8bed\u53e5\u4e2d\u91c7\u7528count(*) \uff0c\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff1a
\nSQL = "SELECT count(*) FROM Customers"<\/p>\n
\u6216\u8005
\nSQL = "SELECT count(*) FROM Customers WHERE c_lastname LIKE 'A%'"<\/p>\n
\u4e3e\u4f8b\u8bf4\u660e\uff0c\u4ee5\u4e0b\u4ee3\u7801\u5c06\u9009\u51fa\u4e00\u4e9b\u8bb0\u5f55\u4ee5\u53ca\u8fd9\u4e9b\u8bb0\u5f55\u7684\u603b\u6570\uff1a
\nSQL = "SELECT c_firstname, c_lastname, count(*) FROM Customers WHERE c_lastname LIKE 'A%'"<\/p>\n
\u4f46\u662f\u4f60\u4e0d\u80fd\u5b9e\u73b0\u81ea\u5df1\u7684\u76ee\u7684\u3002\u8fd9\u91cc\u91c7\u7528\u7684\u201ccount\u201d\u51fd\u6570\u5176\u5b9e\u662f\u4e00\u79cd\u96c6\u5408\u51fd\u6570\uff0c\u610f\u601d\u662f\u53ea\u8fd4\u56de\u5355\u884c\u4fe1\u606f\uff1a\u56de\u7b54\u4f60\u63d0\u51fa\u7684\u95ee\u9898\u3002\u5bf9\u7b2c1\u4e2aSELECT \u8bed\u53e5\u6765\u8bf4\uff0c\u95ee\u9898\u662f\u201c\u5728\u5ba2\u6237\u8868\u5185\u6709\u591a\u5c11\u6761\u8bb0\u5f55\uff1f\u201d\u67e5\u8be2\u8fd4\u56de\u5355\u4e00\u7684\u503c\u4f5c\u4e3a\u54cd\u5e94\uff0c\u56e0\u6b64\u5b83\u4e0d\u80fd\u540c\u4f60\u5e38\u89c4\u7684\u67e5\u8be2\u76f8\u7ec4\u5408\u3002\u5047\u5982\u4f60\u5e0c\u671b\u5f97\u5230\u5176\u4ed6\u6570\u636e\uff0c\u4f60\u9700\u8981\u91c7\u7528 RecordCount\u3002<\/p>\n
\u96c6\u5408\u51fd\u6570\u9664\u4e86\u201ccount\u201d\u4e4b\u5916\u8fd8\u5305\u62ecAVG\u3001MIN\u3001MAX\u548cSUM\u7b49\u3002<\/p>\n
12. \u8fde\u63a5<\/p>\n
\u4efb\u4f55\u719f\u6089SQL\u548c\u5173\u7cfb\u6570\u636e\u5e93\u7684\u4eba\u90fd\u9047\u89c1\u8fc7\u5927\u91cf\u7684\u8fde\u63a5\u7c7b\u578b\u3002\u6700\u7b80\u5355\u7684\u8bf4\uff0c\u8fde\u63a5\uff08join\uff09\u4f1a\u628a\u4e24\u4e2a\u8868\u7684\u5185\u5bb9\u7ec4\u5408\u5230\u4e00\u4e2a\u865a\u62df\u8868\u6216\u8005recordset\u5185\u3002\u5047\u5982\u6570\u636e\u8868\u6709\u6548\u5730\u89c4\u4e00\u5316\uff0c\u6216\u8bb8\u4f60\u4f1a\u7ecf\u5e38\u4ece\u67d0\u4e00\u4e2a\u8868\u4e2d\u9009\u51fa\u7279\u5b9a\u7684\u4fe1\u606f\u518d\u4ece\u53e6\u4e00\u4e2a\u8868\u4e2d\u9009\u51fa\u5173\u8054\u4fe1\u606f\u3002\u8fd9\u6837\u505a\u5c31\u9700\u8981\u7b80\u5355\u7684\u201c\u540c\u7b49\u8fde\u63a5\uff08equijoin\uff09\u201d\u3002<\/p>\n
\u4e3a\u4e86\u4e86\u89e3\u5b9e\u9645\u7684\u8fde\u63a5\u64cd\u4f5c\uff0c\u73b0\u5728\u8ba9\u6211\u4eec\u5047\u8bbe\u5728\u4e00\u4e2a\u6570\u636e\u5e93\u5185\u5b58\u653e\u4e86\u67d0\u7c7b\u8f6f\u4ef6\u7684\u76f8\u5173\u8bb0\u5f55\u3002\u67d0\u4e2a\u8868\uff08Software\uff09\u5305\u542b\u4e86\u8f6f\u4ef6\u4ea7\u54c1\u7684\u540d\u79f0\u3001\u8f6f\u4ef6\u7684\u7248\u672c\u4ee5\u53ca\u5176\u4ed6\u6709\u5173\u7ec6\u8282\uff1a<\/p>\n
\u53e6\u4e00\u4e2a\u8868\uff08Releases\uff09\u5219\u5b58\u50a8\u4e86\u8f6f\u4ef6\u53d1\u5e03\u5386\u53f2\u7684\u4fe1\u606f\uff0c\u5176\u4e2d\u5305\u62ec\u53d1\u5e03\u65e5\u671f\u548c\u53d1\u5e03\u72b6\u6001\u7b49\uff08\u6bd4\u5982\u6d4b\u8bd5\u7248\u3001\u5f53\u524d\u7248\u3001\u8fc7\u65f6\u7b49\uff09\uff1a<\/p>\n
\u4e0a\u8868\u4e2d\u8fd8\u5305\u542b\u4e86\u4e00\u4e2a\u5217\uff0c\u5185\u5bb9\u6307\u5411\u8f6f\u4ef6\u8868\u4e2d\u91c7\u7528\u7684ID\u53f7\u3002\u6240\u4ee5\uff0c\u901a\u8fc7\u8fd9\u79cd\u7d22\u5f15\u8f6f\u4ef6\u8868\u7684\u65b9\u5f0f\uff0c\u4f60\u5c31\u77e5\u9053\u53d1\u5e03\u8868\u4e2dsoftware_ID \u7b49\u4e8e 2\u7684\u8f6f\u4ef6\u662fRome\u3002<\/p>\n
\u4f60\u91c7\u7528\u8fde\u63a5\u7ec4\u5408\u4fe1\u606f\uff0c\u8fd9\u6837\u5c31\u4e0d\u9700\u8981\u5728\u4e24\u4e2a\u8868\u4e4b\u95f4\u6765\u56de\u6298\u817e\u4e86\u3002\u4e0d\u8fc7\uff0c\u9664\u4e86\u7ec4\u5408\u4fe1\u606f\u4e4b\u5916\u8fd8\u53ef\u4ee5\u901a\u8fc7\u8fde\u63a5\u628a\u6709\u5173\u4fe1\u606f\u5408\u5e76\u3002\u8fd9\u6837\uff0c\u53ea\u8981\u53d1\u5e03\u8868\u5185\u7684software_ID \u5339\u914d\u8f6f\u4ef6\u8868\u5185\u7684ID\uff0c\u4f60\u5c31\u628a\u5339\u914d\u4fe1\u606f\u4e00\u8d77\u653e\u5230\u4e00\u4e2a\u8bb0\u5f55\u5185\u3002<\/p>\n
\u4ee3\u7801\u5982\u4e0b\uff1a
\nSQL = "SELECT * FROM Software, Releases WHERE software.ID = releases.softwareID"<\/p>\n
\u4ed4\u7ec6\u5206\u6790\u4ee5\u4e0a\u7684\u8bed\u53e5\uff0c\u9996\u5148\u6ce8\u610f\u5230\u4e24\u4e2a\u8868\u540d\u5217\u5728\u4e86FROM\u7684\u540e\u9762\u3002\u518d\u6839\u636e\u6240\u91c7\u7528\u7684\u8fde\u63a5\uff0c\u4eca\u540e\u4f60\u53ef\u80fd\u8fd8\u4f1a\u53d1\u73b0\u8bed\u6cd5\u4f1a\u6709\u6240\u53d8\u5316\uff08\u6216\u8005\u8fde\u63a5\u7c7b\u578b\u6709\u53d8\uff09\uff0c\u4f46\u662f\u4ee5\u4e0a\u7684\u8bed\u6cd5\u662f\u6700\u57fa\u672c\u7684\uff0c\u663e\u793a\u4e86\u6570\u636e\u7684\u8054\u5408\u9009\u62e9\u65b9\u5f0f\u3002\u8fd9\u91cc\u7684WHERE \u5b50\u53e5\u7528\u6765\u6bd4\u8f83\u7279\u5b9a\u7684ID\u503c\u3002\u5728Software \u8868\u5185\uff0c\u5b58\u5728ID \u5217\u3002\u540c\u6837\u7684\uff0cReleases \u8868\u5185\u5219\u6709\u4e2asoftware_ID \u5217\u3002\u4e3a\u4e86\u660e\u786e\u4f60\u5728WHERE \u5b50\u53e5\u91cc\u8981\u6bd4\u8f83\u7684\u503c\uff0c\u4f60\u7528\u8868\u540d\u4f5c\u4e3a\u524d\u7f00\uff0c\u540e\u9762\u8fd8\u52a0\u4e0a\u4e86\u4e00\u4e2a\u70b9\u53f7\uff08.\uff09\u3002<\/p>\n
\u4ee5\u4e0b\u662f\u8fde\u63a5\u9009\u53d6\u6570\u636e\u4e4b\u540e\u7684\u7ed3\u679c\uff1a<\/p>\n
\u6ce8\u610f\uff1a\u5728\u521b\u5efa\u8fde\u63a5\u7684\u65f6\u5019\u8981\u4ed4\u7ec6\u8003\u8651\u9009\u51fa\u6570\u636e\u7684\u5217\u3002\u4ee5\u4e0a\u4ee3\u7801\u91c7\u7528 * \u901a\u914d\u7b26\u662f\u4e3a\u4e86\u8ba9\u8bfb\u8005\u5173\u6ce8\u4e8eSELECT \u4ee3\u7801\u884c\u7684\u5176\u4ed6\u90e8\u5206\u3002\u4f46\u662f\uff0c\u6b63\u5982\u4f60\u4ece\u4e0a\u56fe\u770b\u5230\u7684\u90a3\u6837\uff0c\u4f60\u65e0\u6cd5\u9009\u51fasoftwareID \u5217\uff0c\u56e0\u4e3a\u8fd9\u4e00\u5217\u6ca1\u6709\u4f5c\u4e3arecordset\u90e8\u5206\u7684\u589e\u52a0\u503c\u3002\u5b83\u7684\u4f5c\u7528\u5c31\u662f\u4e3aWHERE \u5b50\u53e5\u6240\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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