SQL(\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00)\u662f\u4e00\u79cd\u529f\u80fd\u5f3a\u5927\u4e14\u5e7f\u6cdb\u4f7f\u7528\u7684\u8bed\u8a00\uff0c\u7528\u4e8e\u7ba1\u7406\u548c\u64cd\u4f5c\u5b58\u50a8\u5728\u5173\u7cfb\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u3002\u4f46\u662f\uff0c\u4e86\u89e3\u53ef\u80fd\u5bfc\u81f4\u9519\u8bef\u3001\u5b89\u5168\u6f0f\u6d1e\u548c SQL \u4ee3\u7801\u6027\u80fd\u4f4e\u4e0b\u7684\u5e38\u89c1\u9519\u8bef\u5f88\u91cd\u8981\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5c06\u63a2\u8ba8\u7f16\u5199 SQL \u4ee3\u7801\u65f6\u6700\u5e38\u89c1\u7684\u4e00\u4e9b\u9519\u8bef\u4ee5\u53ca\u5982\u4f55\u907f\u514d\u8fd9\u4e9b\u9519\u8bef\u3002<\/p>\n

1. \u6ca1\u6709\u6b63\u786e\u8fc7\u6ee4\u7528\u6237\u8f93\u5165<\/strong><\/div>\n
\u7f16\u5199 SQL \u4ee3\u7801\u65f6\u5e38\u72af\u7684\u4e00\u4e2a\u9519\u8bef\u662f\u6ca1\u6709\u6b63\u786e\u6e05\u7406\u7528\u6237\u8f93\u5165\u3002\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u5b89\u5168\u6f0f\u6d1e\uff0c\u4f8b\u5982 SQL \u6ce8\u5165\u653b\u51fb\uff0c\u6076\u610f\u7528\u6237\u53ef\u4ee5\u5728\u5176\u4e2d\u5c06\u6709\u5bb3\u4ee3\u7801\u6ce8\u5165\u60a8\u7684\u6570\u636e\u5e93\u3002<\/p>\n
\u4e3a\u907f\u514d\u6b64\u9519\u8bef\uff0c\u5728\u60a8\u7684 SQL \u67e5\u8be2\u4e2d\u4f7f\u7528\u7528\u6237\u8f93\u5165\u4e4b\u524d\u59cb\u7ec8\u6e05\u7406\u548c\u9a8c\u8bc1\u7528\u6237\u8f93\u5165\u975e\u5e38\u91cd\u8981\u3002\u8fd9\u53ef\u4ee5\u4f7f\u7528\u51c6\u5907\u597d\u7684\u8bed\u53e5\u548c\u53c2\u6570\u5316\u67e5\u8be2\u7b49\u6280\u672f\u6765\u5b8c\u6210\uff0c\u8fd9\u4e9b\u6280\u672f\u5141\u8bb8\u60a8\u4ee5\u5b89\u5168\u7684\u65b9\u5f0f\u5c06\u53c2\u6570\u4f20\u9012\u7ed9\u60a8\u7684\u67e5\u8be2\u3002<\/p>\n
\u4e0b\u9762\u662f\u4e00\u4e2a\u5728MySQL\u4e2d\u4f7f\u7528\u51c6\u5907\u597d\u7684\u8bed\u53e5\u7684\u4f8b\u5b50\uff1a<\/p>\n
$mysqli = new mysqli(\"localhost\", \"username\", \"password\", \"database\");\r\n\/\/ Create a prepared statement\r\n$stmt = $mysqli->prepare(\"SELECT * FROM users WHERE email = ? AND password \r\n= ?\");\r\n\/\/ Bind the parameters\r\n$stmt->bind_param(\"ss\", $email, $password);\r\n\/\/ Execute the statement\r\n$stmt->execute();\r\n\/\/ Fetch the results\r\n$result = $stmt->get_result();<\/pre>\n
\u901a\u8fc7\u6b63\u786e\u6e05\u7406\u548c\u9a8c\u8bc1\u7528\u6237\u8f93\u5165\uff0c\u60a8\u53ef\u4ee5\u5e2e\u52a9\u4fdd\u62a4\u6570\u636e\u5e93\u514d\u53d7\u5b89\u5168\u6f0f\u6d1e\u7684\u5f71\u54cd\uff0c\u5e76\u786e\u4fdd\u60a8\u7684 SQL \u4ee3\u7801\u53ef\u9760\u4e14\u5065\u58ee\u3002<\/p>\n
2. \u6ca1\u6709\u4f7f\u7528\u5408\u9002\u7684\u7d22\u5f15<\/strong><\/div>\n
\u6b63\u786e\u7684\u7d22\u5f15\u5bf9\u4e8e\u4f18\u5316 SQL \u67e5\u8be2\u7684\u6027\u80fd\u5f88\u91cd\u8981\u3002\u5982\u679c\u6ca1\u6709\u9002\u5f53\u7684\u7d22\u5f15\uff0c\u60a8\u7684\u67e5\u8be2\u53ef\u80fd\u9700\u8981\u66f4\u957f\u65f6\u95f4\u624d\u80fd\u6267\u884c\uff0c\u5c24\u5176\u662f\u5f53\u60a8\u6709\u5927\u91cf\u6570\u636e\u65f6\u3002<\/p>\n
\u4e3a\u907f\u514d\u8fd9\u79cd\u9519\u8bef\uff0c\u4ed4\u7ec6\u8003\u8651\u8981\u7d22\u5f15\u54ea\u4e9b\u5217\u4ee5\u53ca\u5982\u4f55\u7d22\u5f15\u5b83\u4eec\u5f88\u91cd\u8981\u3002\u5728\u9009\u62e9\u8981\u7d22\u5f15\u7684\u5217\u65f6\uff0c\u60a8\u8fd8\u5e94\u8be5\u8003\u8651\u8868\u7684\u6570\u636e\u5206\u5e03\u548c\u67e5\u8be2\u6a21\u5f0f\u3002<\/p>\n
\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u6709\u4e00\u4e2a\u5305\u542b\u5927\u91cf\u884c\u7684\u8868\u5e76\u4e14\u60a8\u7ecf\u5e38\u641c\u7d22\u57fa\u4e8e\u7279\u5b9a\u5217\u7684\u8bb0\u5f55\uff0c\u90a3\u4e48\u5728\u8be5\u5217\u4e0a\u521b\u5efa\u7d22\u5f15\u53ef\u80fd\u4f1a\u6709\u597d\u5904\u3002\u53e6\u4e00\u65b9\u9762\uff0c\u5982\u679c\u60a8\u6709\u4e00\u4e2a\u53ea\u6709\u51e0\u884c\u4e14\u6ca1\u6709\u7279\u5b9a\u641c\u7d22\u6a21\u5f0f\u7684\u5c0f\u8868\uff0c\u521b\u5efa\u7d22\u5f15\u53ef\u80fd\u4e0d\u4f1a\u63d0\u4f9b\u592a\u591a\u597d\u5904\u3002<\/p>\n
\u8003\u8651\u4f7f\u7528\u4e0d\u540c\u7d22\u5f15\u7c7b\u578b(\u4f8b\u5982 B \u6811\u3001\u6563\u5217\u548c\u5168\u6587\u7d22\u5f15)\u7684\u6743\u8861\u4e5f\u5f88\u91cd\u8981\u3002\u6bcf\u79cd\u7c7b\u578b\u7684\u7d22\u5f15\u90fd\u6709\u5176\u81ea\u8eab\u7684\u4f18\u70b9\u548c\u7f3a\u70b9\uff0c\u6839\u636e\u60a8\u7684\u9700\u8981\u9009\u62e9\u6b63\u786e\u7684\u7d22\u5f15\u5f88\u91cd\u8981\u3002<\/p>\n
3. \u6ca1\u6709\u4f7f\u7528\u6b63\u786e\u7684\u6570\u636e\u7c7b\u578b<\/strong><\/div>\n
\u4e3a\u5217\u9009\u62e9\u6b63\u786e\u7684\u6570\u636e\u7c7b\u578b\u5bf9\u4e8e\u786e\u4fdd\u9ad8\u6548\u51c6\u786e\u5730\u5b58\u50a8\u6570\u636e\u975e\u5e38\u91cd\u8981\u3002\u4f7f\u7528\u9519\u8bef\u7684\u6570\u636e\u7c7b\u578b\u4f1a\u5bfc\u81f4\u6570\u636e\u4e22\u5931\u3001\u6392\u5e8f\u4e0d\u6b63\u786e\u548c\u6027\u80fd\u4e0d\u4f73\u7b49\u95ee\u9898\u3002<\/p>\n
\u4f8b\u5982\uff0cVARCHAR\u5bf9\u4ec5\u5305\u542b\u6570\u503c\u7684\u5217\u4f7f\u7528\u6570\u636e\u7c7b\u578b\u53ef\u80fd\u4f1a\u5bfc\u81f4\u67e5\u8be2\u901f\u5ea6\u53d8\u6162\u5e76\u589e\u52a0\u5b58\u50a8\u9700\u6c42\u3002\u53e6\u4e00\u65b9\u9762\uff0c\u5bf9\u5305\u542b\u5927\u91cf\u6587\u672c\u6570\u636e\u7684\u5217\u4f7f\u7528 INT \u6570\u636e\u7c7b\u578b\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u636e\u4e22\u5931\u3002<\/p>\n
\u4e3a\u907f\u514d\u6b64\u9519\u8bef\uff0c\u8bf7\u52a1\u5fc5\u4ed4\u7ec6\u8003\u8651\u5217\u7684\u6570\u636e\u7c7b\u578b\uff0c\u5e76\u6839\u636e\u8981\u5b58\u50a8\u7684\u6570\u636e\u7684\u7c7b\u578b\u548c\u5927\u5c0f\u9009\u62e9\u6b63\u786e\u7684\u6570\u636e\u7c7b\u578b\u3002\u67e5\u770b\u60a8\u7684\u6570\u636e\u5e93\u7cfb\u7edf\u652f\u6301\u7684\u6570\u636e\u7c7b\u578b\u5e76\u9009\u62e9\u6700\u9002\u5408\u60a8\u9700\u8981\u7684\u6570\u636e\u7c7b\u578b\u4e5f\u662f\u4e00\u4e2a\u597d\u4e3b\u610f\u3002<\/p>\n
4. \u6ca1\u6709\u6b63\u786e\u89c4\u8303\u5316\u4f60\u7684\u6570\u636e<\/strong><\/div>\n
\u6b63\u786e\u7684\u6570\u636e\u89c4\u8303\u5316\u5bf9\u4e8e\u786e\u4fdd\u6709\u6548\u7ec4\u7ec7\u6570\u636e\u548c\u51cf\u5c11\u5197\u4f59\u975e\u5e38\u91cd\u8981\u3002\u5982\u679c\u6ca1\u6709\u9002\u5f53\u7684\u89c4\u8303\u5316\uff0c\u60a8\u6700\u7ec8\u53ef\u80fd\u4f1a\u5f97\u5230\u91cd\u590d\u7684\u3001\u96be\u4ee5\u66f4\u65b0\u7684\u6216\u5bb9\u6613\u51fa\u73b0\u4e0d\u4e00\u81f4\u7684\u6570\u636e\u3002<\/p>\n
\u4e3a\u907f\u514d\u6b64\u9519\u8bef\uff0c\u9075\u5faa\u6b63\u786e\u7684\u89c4\u8303\u5316\u539f\u5219\u5f88\u91cd\u8981\uff0c\u4f8b\u5982\u5c06\u5927\u8868\u5206\u89e3\u4e3a\u8f83\u5c0f\u7684\u8868\u5e76\u4f7f\u7528\u5916\u952e\u5728\u5b83\u4eec\u4e4b\u95f4\u521b\u5efa\u5173\u7cfb\u3002\u5728\u51b3\u5b9a\u5982\u4f55\u89c4\u8303\u5316\u6570\u636e\u65f6\uff0c\u60a8\u8fd8\u5e94\u8be5\u8003\u8651\u5e94\u7528\u7a0b\u5e8f\u7684\u9700\u6c42\u548c\u5b58\u50a8\u7684\u6570\u636e\u7c7b\u578b\u3002<\/p>\n
\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u6709\u4e00\u4e2a\u5305\u542b\u5927\u91cf\u5217\u7684\u8868\uff0c\u5e76\u4e14\u8bb8\u591a\u5217\u662f\u53ef\u9009\u7684\u6216\u4ec5\u5305\u542b\u51e0\u4e2a\u4e0d\u540c\u7684\u503c\uff0c\u5219\u5c06\u8868\u5206\u89e3\u4e3a\u8f83\u5c0f\u7684\u5217\u5e76\u4f7f\u7528\u5916\u952e\u5728\u5b83\u4eec\u4e4b\u95f4\u521b\u5efa\u5173\u7cfb\u53ef\u80fd\u4f1a\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n
5. \u6ca1\u6709\u4f7f\u7528\u6b63\u786e\u7684 SQL \u8bed\u6cd5<\/strong><\/div>\n
SQL \u5177\u6709\u7279\u5b9a\u7684\u8bed\u6cd5\uff0c\u5fc5\u987b\u9075\u5faa\u8be5\u8bed\u6cd5\u624d\u80fd\u6b63\u786e\u6267\u884c\u67e5\u8be2\u3002\u4e0d\u4f7f\u7528\u6b63\u786e\u7684\u8bed\u6cd5\u4f1a\u5bfc\u81f4\u8bed\u6cd5\u9519\u8bef\u548c\u4e0d\u6b63\u786e\u7684\u67e5\u8be2\u7ed3\u679c\u3002<\/p>\n
\u4e3a\u907f\u514d\u6b64\u9519\u8bef\uff0c\u8bf7\u52a1\u5fc5\u4ed4\u7ec6\u68c0\u67e5 SQL \u67e5\u8be2\u7684\u8bed\u6cd5\u5e76\u786e\u4fdd\u9488\u5bf9\u6240\u7528\u7684\u7279\u5b9a\u6570\u636e\u5e93\u7cfb\u7edf\u4f7f\u7528\u6b63\u786e\u7684\u8bed\u6cd5\u3002\u4f7f\u7528 SQL linter \u6216\u8bed\u6cd5\u68c0\u67e5\u5668\u6765\u8bc6\u522b\u8bed\u6cd5\u95ee\u9898\u4e5f\u662f\u4e00\u4e2a\u597d\u4e3b\u610f\u3002<\/p>\n
6. \u6ca1\u6709\u6b63\u786e\u7ec4\u7ec7\u548c\u683c\u5f0f\u5316\u4f60\u7684\u4ee3\u7801<\/strong><\/div>\n
\u6b63\u786e\u7684\u4ee3\u7801\u7ec4\u7ec7\u548c\u683c\u5f0f\u5bf9\u4e8e\u4f7f\u60a8\u7684 SQL \u4ee3\u7801\u66f4\u6613\u4e8e\u9605\u8bfb\u548c\u7406\u89e3\u975e\u5e38\u91cd\u8981\u3002\u5982\u679c\u7ec4\u7ec7\u4e0d\u5f53\uff0c\u60a8\u7684\u4ee3\u7801\u53ef\u80fd\u96be\u4ee5\u7ef4\u62a4\u548c\u8c03\u8bd5\u3002<\/p>\n
\u4e3a\u907f\u514d\u6b64\u9519\u8bef\uff0c\u6700\u597d\u9075\u5faa\u6807\u51c6\u7684 SQL \u7f16\u7801\u5b9e\u8df5\uff0c\u4f8b\u5982\u4f7f\u7528\u6b63\u786e\u7684\u7f29\u8fdb\u3001\u5bf9 SQL \u5173\u952e\u5b57\u4f7f\u7528\u5927\u5199\u5b57\u6bcd\u4ee5\u53ca\u5bf9\u8868\u548c\u5217\u4f7f\u7528\u63cf\u8ff0\u6027\u540d\u79f0\u3002\u4f7f\u7528\u4ee3\u7801\u683c\u5f0f\u5316\u7a0b\u5e8f\u81ea\u52a8\u683c\u5f0f\u5316\u60a8\u7684\u4ee3\u7801\u4ee5\u9075\u5faa\u8fd9\u4e9b\u505a\u6cd5\u4e5f\u662f\u4e00\u4e2a\u597d\u4e3b\u610f\u3002<\/p>\n
\u901a\u8fc7\u9075\u5faa\u6b63\u786e\u7684\u4ee3\u7801\u7ec4\u7ec7\u548c\u683c\u5f0f\u5316\u5b9e\u8df5\uff0c\u60a8\u53ef\u4ee5\u4f7f SQL \u4ee3\u7801\u66f4\u6613\u4e8e\u9605\u8bfb\u548c\u7ef4\u62a4\u3002<\/p>\n
7. \u4ea4\u6613\u4f7f\u7528\u4e0d\u5f53<\/strong><\/div>\n
\u4e8b\u52a1\u662f SQL \u7684\u4e00\u9879\u91cd\u8981\u529f\u80fd\uff0c\u5b83\u5141\u8bb8\u60a8\u5c06\u591a\u4e2a\u67e5\u8be2\u7ec4\u5408\u5728\u4e00\u8d77\uff0c\u5e76\u5c06\u6574\u4e2a\u7ec4\u4f5c\u4e3a\u4e00\u4e2a\u5355\u5143\u63d0\u4ea4\u6216\u56de\u6eda\u3002\u672a\u80fd\u6b63\u786e\u4f7f\u7528\u4e8b\u52a1\u4f1a\u5bfc\u81f4\u6570\u636e\u4e0d\u4e00\u81f4\uff0c\u5e76\u4f7f\u4ece\u9519\u8bef\u4e2d\u6062\u590d\u53d8\u5f97\u66f4\u52a0\u56f0\u96be\u3002<\/p>\n
\u4e3a\u907f\u514d\u8fd9\u79cd\u9519\u8bef\uff0c\u4e86\u89e3\u4e8b\u52a1\u7684\u5de5\u4f5c\u539f\u7406\u5e76\u6b63\u786e\u4f7f\u7528\u5b83\u4eec\u5f88\u91cd\u8981\u3002\u8fd9\u5305\u62ec\u4e86\u89e3\u60a8\u7684\u6570\u636e\u5e93\u7cfb\u7edf\u7684\u9694\u79bb\u7ea7\u522b\u5e76\u6839\u636e\u60a8\u7684\u9700\u8981\u4f7f\u7528\u6b63\u786e\u7684\u7ea7\u522b\u3002\u5728\u60a8\u7684\u4e8b\u52a1\u4e2d\u4f7f\u7528\u4fdd\u5b58\u70b9\u4ee5\u5141\u8bb8\u5bf9\u5355\u4e2a\u67e5\u8be2\u7684\u56de\u6eda\u8fdb\u884c\u66f4\u7ec6\u7c92\u5ea6\u7684\u63a7\u5236\u4e5f\u662f\u4e00\u4e2a\u597d\u4e3b\u610f\u3002<\/p>\n
\u4e0b\u9762\u662f\u4e00\u4e2a\u5728 MySQL \u4e2d\u4f7f\u7528\u4e8b\u52a1\u7684\u4f8b\u5b50\uff1a<\/p>\n
$mysqli = new mysqli(\"localhost\", \"username\", \"password\", \"database\");\r\n\/\/ Start a transaction\r\n$mysqli->begin_transaction();\r\n\/\/ Execute some queries\r\n$mysqli->query(\"INSERT INTO users (name, email) VALUES ('John', \r\n'john@example.com')\");\r\n$mysqli->query(\"INSERT INTO orders (user_id, product_id) VALUES \r\n(LAST_INSERT_ID(), 123)\");\r\n\/\/ Commit the transaction\r\n$mysqli->commit();<\/pre>\n
\u901a\u8fc7\u6b63\u786e\u4f7f\u7528\u4e8b\u52a1\uff0c\u60a8\u53ef\u4ee5\u786e\u4fdd\u6570\u636e\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\uff0c\u5e76\u66f4\u5bb9\u6613\u4ece\u9519\u8bef\u4e2d\u6062\u590d\u3002<\/p>\n
8. \u6570\u636e\u5206\u7ec4\u548c\u805a\u5408\u4e0d\u5f53<\/strong><\/div>\n
\u5206\u7ec4\u548c\u805a\u5408\u6570\u636e\u662f SQL \u7684\u4e00\u9879\u91cd\u8981\u529f\u80fd\uff0c\u5b83\u5141\u8bb8\u60a8\u5bf9\u5927\u578b\u6570\u636e\u96c6\u6267\u884c\u8ba1\u7b97\u5e76\u4ee5\u6c47\u603b\u5f62\u5f0f\u68c0\u7d22\u7ed3\u679c\u3002\u4f46\u662f\uff0c\u91cd\u8981\u7684\u662f\u4f7f\u7528\u6b63\u786e\u7684\u5206\u7ec4\u548c\u805a\u5408\u6280\u672f\u4ee5\u786e\u4fdd\u60a8\u83b7\u5f97\u9884\u671f\u7684\u7ed3\u679c\u3002<\/p>\n
\u4e3a\u907f\u514d\u6b64\u9519\u8bef\uff0c\u4e86\u89e3 SQL \u4e2d\u53ef\u7528\u7684\u4e0d\u540c\u805a\u5408\u51fd\u6570\u4ee5\u53ca\u5982\u4f55\u4f7f\u7528\u5b83\u4eec\u5f88\u91cd\u8981\u3002\u4e00\u4e9b\u5e38\u89c1\u7684\u805a\u5408\u51fd\u6570\u5305\u62ecCOUNT\u3001SUM\u3001AVG\u548cMAX\u3002\u4f7f\u7528\u9002\u5f53\u7684\u5206\u7ec4\u6280\u672f(\u4f8b\u5982\u4f7f\u7528GROUP BYandHAVING\u5b50\u53e5)\u4e5f\u5f88\u91cd\u8981\uff0c\u4ee5\u786e\u4fdd\u6b63\u786e\u5206\u7ec4\u6570\u636e\u3002<\/p>\n
\u4e0b\u9762\u662f\u4e00\u4e2a\u5728 MySQL \u4e2d\u4f7f\u7528\u805a\u5408\u548c\u5206\u7ec4\u7684\u4f8b\u5b50\uff1a<\/p>\n
SELECT COUNT(*) as num_orders, SUM(total_price) as total_revenue\r\nFROM orders\r\nGROUP BY user_id\r\nHAVING num_orders > 5<\/pre>\n
\u901a\u8fc7\u6b63\u786e\u5206\u7ec4\u548c\u805a\u5408\u6570\u636e\uff0c\u60a8\u53ef\u4ee5\u5bf9\u5927\u91cf\u6570\u636e\u6267\u884c\u5f3a\u5927\u7684\u8ba1\u7b97\u5e76\u4ee5\u6c47\u603b\u5f62\u5f0f\u68c0\u7d22\u7ed3\u679c\u3002<\/p>\n
9. \u6ca1\u6709\u4f18\u5316\u6027\u80fd<\/strong><\/div>\n
\u6027\u80fd\u5bf9\u4e8e\u786e\u4fdd\u60a8\u7684 SQL \u67e5\u8be2\u9ad8\u6548\u6267\u884c\u5e76\u4e14\u4e0d\u5f71\u54cd\u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u975e\u5e38\u91cd\u8981\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528\u591a\u79cd\u6280\u672f\u6765\u4f18\u5316 SQL \u67e5\u8be2\u7684\u6027\u80fd\uff0c\u5305\u62ec\u9002\u5f53\u7684\u7d22\u5f15\u3001\u4f18\u5316\u548c\u7f13\u5b58\u3002<\/p>\n
\u4e3a\u907f\u514d\u6b64\u9519\u8bef\uff0c\u4ed4\u7ec6\u8003\u8651 SQL \u67e5\u8be2\u7684\u6027\u80fd\u5e76\u4f7f\u7528\u8bf8\u5982EXPLAIN\u5206\u6790\u5176\u6027\u80fd\u4e4b\u7c7b\u7684\u6280\u672f\u975e\u5e38\u91cd\u8981\u3002\u60a8\u8fd8\u5e94\u8be5\u8003\u8651\u4f7f\u7528\u67e5\u8be2\u4f18\u5316\u5de5\u5177\u548c\u6280\u672f(\u4f8b\u5982\u8986\u76d6\u7d22\u5f15\u548c\u67e5\u8be2\u63d0\u793a)\u6765\u63d0\u9ad8\u67e5\u8be2\u7684\u6027\u80fd\u3002<\/p>\n
\u4e0b\u9762\u662f\u4e00\u4e2aEXPLAIN\u7528\u4e8e\u5206\u6790SELECTMySQL \u67e5\u8be2\u6027\u80fd\u7684\u4f8b\u5b50\uff1a<\/p>\n
EXPLAIN SELECT * FROM users WHERE name = 'John';<\/pre>\n
\u901a\u8fc7\u4f18\u5316 SQL \u67e5\u8be2\u7684\u6027\u80fd\uff0c\u60a8\u53ef\u4ee5\u786e\u4fdd\u6570\u636e\u5e93\u9ad8\u6548\u8fd0\u884c\u5e76\u4e14\u60a8\u7684\u5e94\u7528\u7a0b\u5e8f\u63d0\u4f9b\u826f\u597d\u7684\u7528\u6237\u4f53\u9a8c\u3002<\/p>\n
\u7ed3\u8bba<\/strong><\/div>\n
\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u63a2\u8ba8\u4e86\u7f16\u5199 SQL \u4ee3\u7801\u65f6\u6700\u5e38\u89c1\u7684\u4e00\u4e9b\u9519\u8bef\u4ee5\u53ca\u5982\u4f55\u907f\u514d\u8fd9\u4e9b\u9519\u8bef\u3002\u901a\u8fc7\u9075\u5faa\u6700\u4f73\u5b9e\u8df5\u5e76\u4e86\u89e3\u6f5c\u5728\u7684\u9677\u9631\uff0c\u60a8\u53ef\u4ee5\u7f16\u5199\u66f4\u53ef\u9760\u3001\u66f4\u9ad8\u6548\u7684 SQL \u4ee3\u7801\u5e76\u907f\u514d\u5e38\u89c1\u9519\u8bef\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
SQL(\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00)\u662f\u4e00\u79cd\u529f\u80fd\u5f3a\u5927\u4e14\u5e7f\u6cdb\u4f7f\u7528\u7684\u8bed\u8a00\uff0c\u7528\u4e8e\u7ba1\u7406\u548c\u64cd\u4f5c\u5b58\u50a8\u5728\u5173\u7cfb\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u3002\u4f46\u662f\uff0c\u4e86\u89e3\u53ef\u80fd […]<\/p>\n","protected":false},"author":1920,"featured_media":200375,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[55],"tags":[],"class_list":["post-261776","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-thread"],"acf":[],"_links":{"self":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/261776","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/users\/1920"}],"replies":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/comments?post=261776"}],"version-history":[{"count":3,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/261776\/revisions"}],"predecessor-version":[{"id":261787,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/261776\/revisions\/261787"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media\/200375"}],"wp:attachment":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media?parent=261776"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/categories?post=261776"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/tags?post=261776"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}