{"id":37828,"date":"2024-06-12T23:50:37","date_gmt":"2024-06-12T23:50:37","guid":{"rendered":"https:\/\/onlineexammaker.com\/kb\/?p=37828"},"modified":"2024-09-04T06:38:40","modified_gmt":"2024-09-04T06:38:40","slug":"10-sql-developer-interview-questions","status":"publish","type":"post","link":"https:\/\/onlineexammaker.com\/kb\/10-sql-developer-interview-questions\/","title":{"rendered":"10 SQL Developer Interview Questions and Sample Answers"},"content":{"rendered":"<p>\u4f5c\u70ba SQL \u958b\u767c\u4eba\u54e1\uff0c\u60a8\u5c07\u8ca0\u8cac\u8a2d\u8a08\u3001\u958b\u767c\u548c\u7dad\u8b77\u516c\u53f8\u6216\u5ba2\u6236\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u3002\u60a8\u7684\u4e3b\u8981\u5de5\u4f5c\u662f\u64b0\u5beb\u548c\u512a\u5316 SQL \u67e5\u8a62\uff0c\u8a2d\u8a08\u6578\u64da\u5eab\u67b6\u69cb\uff0c\u4e26\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u6027\u80fd\u3002\u60a8\u5c07\u8207\u958b\u767c\u4eba\u54e1\u3001\u6578\u64da\u5206\u6790\u5e2b\u548c\u7cfb\u7d71\u7ba1\u7406\u54e1\u5408\u4f5c\uff0c\u78ba\u4fdd\u6578\u64da\u5eab\u80fd\u5920\u652f\u6301\u696d\u52d9\u9700\u6c42\u4e26\u63d0\u9ad8\u6574\u9ad4\u7cfb\u7d71\u6027\u80fd\u3002<\/p>\n<p><strong>\u4e3b\u8981\u8077\u8cac<\/strong>\uff1a<\/p>\n<p>\u6578\u64da\u5eab\u8a2d\u8a08\u548c\u5efa\u6a21\uff1a \u8a2d\u8a08\u548c\u5be6\u65bd\u6578\u64da\u5eab\u67b6\u69cb\uff0c\u5efa\u7acb\u548c\u7dad\u8b77\u6578\u64da\u8868\u3001\u7d22\u5f15\u548c\u95dc\u806f\uff0c\u4ee5\u652f\u6301\u61c9\u7528\u7a0b\u5e8f\u548c\u696d\u52d9\u9700\u6c42\u3002<br \/>\n\u64b0\u5beb\u548c\u512a\u5316 SQL \u67e5\u8a62\uff1a \u64b0\u5beb\u9ad8\u6548\u7684 SQL \u67e5\u8a62\u4ee5\u63d0\u53d6\u3001\u63d2\u5165\u3001\u66f4\u65b0\u548c\u522a\u9664\u6578\u64da\uff0c\u4e26\u9032\u884c\u67e5\u8a62\u512a\u5316\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<br \/>\n\u6578\u64da\u5eab\u7dad\u8b77\uff1a \u76e3\u63a7\u6578\u64da\u5eab\u6027\u80fd\uff0c\u57f7\u884c\u6578\u64da\u5eab\u5099\u4efd\u548c\u6062\u5fa9\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u6027\u548c\u5b8c\u6574\u6027\u3002<br \/>\n\u6578\u64da\u6574\u5408\u548c\u8f49\u63db\uff1a \u4f7f\u7528 SQL \u548c\u5176\u4ed6 ETL \u5de5\u5177\u9032\u884c\u6578\u64da\u6574\u5408\u3001\u8f49\u63db\u548c\u6e05\u7406\uff0c\u4ee5\u652f\u6301\u5831\u544a\u548c\u5206\u6790\u9700\u6c42\u3002<br \/>\n\u652f\u6301\u958b\u767c\u548c\u5206\u6790\u5718\u968a\uff1a \u63d0\u4f9b\u6578\u64da\u5eab\u76f8\u95dc\u7684\u652f\u6301\uff0c\u5354\u52a9\u958b\u767c\u4eba\u54e1\u548c\u6578\u64da\u5206\u6790\u5e2b\u89e3\u6c7a\u6280\u8853\u554f\u984c\u548c\u6027\u80fd\u74f6\u9838\u3002<br \/>\n\u6578\u64da\u5eab\u5b89\u5168\u6027\uff1a \u5be6\u65bd\u6578\u64da\u5eab\u5b89\u5168\u63aa\u65bd\uff0c\u63a7\u5236\u7528\u6236\u8a2a\u554f\u6b0a\u9650\uff0c\u9632\u6b62\u672a\u7d93\u6388\u6b0a\u7684\u6578\u64da\u8a2a\u554f\u3002<br \/>\n\u7de8\u5beb\u6587\u6a94\uff1a \u64b0\u5beb\u548c\u7dad\u8b77\u6578\u64da\u5eab\u8a2d\u8a08\u6587\u6a94\u3001\u67e5\u8a62\u6587\u6a94\u548c\u64cd\u4f5c\u6307\u5357\uff0c\u78ba\u4fdd\u5718\u968a\u6210\u54e1\u80fd\u5920\u7406\u89e3\u548c\u9075\u5faa\u6578\u64da\u5eab\u6a19\u6e96\u3002<br \/>\n\u6301\u7e8c\u6539\u9032\uff1a \u7814\u7a76\u548c\u8a55\u4f30\u65b0\u7684\u6578\u64da\u5eab\u6280\u8853\u548c\u5de5\u5177\uff0c\u63d0\u51fa\u6539\u9032\u5efa\u8b70\u4ee5\u63d0\u5347\u7cfb\u7d71\u6027\u80fd\u548c\u6548\u7387\u3002<\/p>\n<h3>\u6587\u7ae0\u76ee\u9304<\/h3>\n<ul class=\"article_list\">\n<li><a href=\"#1\">\u7b2c 1 \u90e8\u5206\uff1a10 \u500b SQL \u958b\u767c\u4eba\u54e1\u9762\u8a66\u554f\u984c\u548c\u7bc4\u4f8b\u7b54\u6848<\/a><\/li>\n<li><a href=\"#2\">\u7b2c 2 \u90e8\u5206\uff1a\u5617\u8a66\u4f7f\u7528 OnlineExamMaker AI \u554f\u984c\u7522\u751f\u5668\u5efa\u7acb\u6e2c\u9a57\u554f\u984c<\/a><\/li>\n<li><a href=\"#3\">\u7b2c 3 \u90e8\u5206\uff1a\u7528\u65bc\u5de5\u4f5c\u8a55\u4f30\u7684\u514d\u8cbb\u7dda\u4e0a\u6e2c\u9a57\u5275\u5efa\u5668 &#8211; OnlineExamMaker<\/a><\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/onlineexammaker.com\/kb\/wp-content\/uploads\/2024\/06\/13-10-sql-developer-interview-questions.webp\" alt=\"\" \/><\/p>\n<h3 id=\"1\">\u7b2c 1 \u90e8\u5206\uff1a10 \u500b SQL \u958b\u767c\u4eba\u54e1\u9762\u8a66\u554f\u984c\u548c\u7bc4\u4f8b\u7b54\u6848<\/h3>\n<p><button type=\"button\" id=\"copyquestionsBtn\" onClick=\"myFunction()\">\u8907\u88fd\u9762\u8a66\u554f\u984c<\/button><\/p>\n<div id=\"copy_questions\">\n<p> 1. \u4ec0\u9ebc\u662f SQL \u548c SQL \u7684\u4e3b\u8981\u529f\u80fd\u662f\u4ec0\u9ebc\uff1f<\/p>\n<p><strong>\u7bc4\u4f8b\u7b54\u6848<\/strong>\uff1a<br \/>\nSQL\uff08Structured Query Language\uff09\u662f\u4e00\u7a2e\u7528\u65bc\u7ba1\u7406\u548c\u64cd\u4f5c\u95dc\u806f\u578b\u6578\u64da\u5eab\u7684\u8a9e\u8a00\u3002\u5b83\u7684\u4e3b\u8981\u529f\u80fd\u5305\u62ec\uff1a<\/p>\n<p>&#8211; \u6578\u64da\u67e5\u8a62\uff1a \u4f7f\u7528 SELECT \u8a9e\u53e5\u6aa2\u7d22\u6578\u64da\u3002<br \/>\n&#8211; \u6578\u64da\u64cd\u4f5c\uff1a \u4f7f\u7528 INSERT\u3001UPDATE \u548c DELETE \u8a9e\u53e5\u4fee\u6539\u6578\u64da\u3002<br \/>\n&#8211; \u6578\u64da\u5eab\u7d50\u69cb\u7ba1\u7406\uff1a \u4f7f\u7528 CREATE\u3001ALTER \u548c DROP \u8a9e\u53e5\u5275\u5efa\u3001\u4fee\u6539\u548c\u522a\u9664\u6578\u64da\u5eab\u5c0d\u8c61\uff08\u5982\u8868\u3001\u7d22\u5f15\uff09\u3002<br \/>\n&#8211; \u6578\u64da\u63a7\u5236\uff1a \u4f7f\u7528 GRANT \u548c REVOKE \u8a9e\u53e5\u7ba1\u7406\u7528\u6236\u6b0a\u9650\u3002<\/p>\n<p> 2. \u5982\u4f55\u512a\u5316 SQL \u67e5\u8a62\u6027\u80fd\uff1f<\/p>\n<p><strong>\u7bc4\u4f8b\u7b54\u6848<\/strong>\uff1a<br \/>\n\u512a\u5316 SQL \u67e5\u8a62\u6027\u80fd\u7684\u65b9\u6cd5\u5305\u62ec\uff1a<\/p>\n<p>&#8211; \u4f7f\u7528\u7d22\u5f15\uff1a \u70ba\u983b\u7e41\u67e5\u8a62\u7684\u5217\u5275\u5efa\u7d22\u5f15\uff0c\u63d0\u5347\u67e5\u8a62\u901f\u5ea6\u3002<br \/>\n&#8211; \u907f\u514d\u4f7f\u7528 SELECT *\uff1a \u53ea\u9078\u64c7\u9700\u8981\u7684\u5217\uff0c\u6e1b\u5c11\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u50b3\u8f38\u3002<br \/>\n&#8211; \u4f7f\u7528 EXPLAIN\uff1a \u5206\u6790\u67e5\u8a62\u8a08\u5283\uff0c\u4e86\u89e3\u67e5\u8a62\u7684\u57f7\u884c\u65b9\u5f0f\u4e26\u9032\u884c\u512a\u5316\u3002<br \/>\n&#8211; \u7c21\u5316\u67e5\u8a62\uff1a \u5118\u91cf\u907f\u514d\u8907\u96dc\u7684\u5b50\u67e5\u8a62\u548c\u806f\u63a5\uff0c\u7c21\u5316\u67e5\u8a62\u908f\u8f2f\u3002<br \/>\n&#8211; \u907f\u514d\u91cd\u8907\u8a08\u7b97\uff1a \u4f7f\u7528\u81e8\u6642\u8868\u6216\u5b50\u67e5\u8a62\u4f86\u907f\u514d\u91cd\u8907\u8a08\u7b97\u76f8\u540c\u7684\u6578\u64da\u3002<\/p>\n<p> 3. \u4f60\u5982\u4f55\u8655\u7406 SQL \u67e5\u8a62\u4e2d\u7684\u7a7a\u503c\uff08NULL\uff09\uff1f<\/p>\n<p><strong>\u7bc4\u4f8b\u7b54\u6848<\/strong>\uff1a<br \/>\n\u5728 SQL \u67e5\u8a62\u4e2d\u8655\u7406\u7a7a\u503c\uff08NULL\uff09\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\uff1a<\/p>\n<p>&#8211; IS NULL \u548c IS NOT NULL\uff1a \u7528\u65bc\u6aa2\u67e5\u5b57\u6bb5\u662f\u5426\u70ba\u7a7a\u503c\u3002\u4f8b\u5982\uff1a`SELECT * FROM table WHERE column IS NULL;`<br \/>\n&#8211; COALESCE \u51fd\u6578\uff1a \u8fd4\u56de\u7b2c\u4e00\u500b\u975e\u7a7a\u503c\u3002\u4f8b\u5982\uff1a`SELECT COALESCE(column, &#8216;default_value&#8217;) FROM table;`<br \/>\n&#8211; NULLIF \u51fd\u6578\uff1a \u6bd4\u8f03\u5169\u500b\u503c\uff0c\u5982\u679c\u5b83\u5011\u76f8\u7b49\u5247\u8fd4\u56de NULL\uff0c\u5426\u5247\u8fd4\u56de\u7b2c\u4e00\u500b\u503c\u3002\u4f8b\u5982\uff1a`SELECT NULLIF(column1, column2) FROM table;`<\/p>\n<p> 4. \u4ec0\u9ebc\u662f JOIN\uff1f\u5217\u8209\u4e26\u89e3\u91cb\u4e0d\u540c\u985e\u578b\u7684 JOIN\u3002<\/p>\n<p><strong>\u7bc4\u4f8b\u7b54\u6848<\/strong>\uff1a<br \/>\nJOIN \u7528\u65bc\u5c07\u591a\u500b\u8868\u4e2d\u7684\u6578\u64da\u7d50\u5408\u8d77\u4f86\u3002\u5e38\u898b\u7684 JOIN \u985e\u578b\u5305\u62ec\uff1a<\/p>\n<p>&#8211; INNER JOIN\uff1a \u8fd4\u56de\u5169\u500b\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002\u4f8b\uff1a`SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.id;`<br \/>\n&#8211; LEFT JOIN\uff08\u6216 LEFT OUTER JOIN\uff09\uff1a \u8fd4\u56de\u5de6\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u4ee5\u53ca\u53f3\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002\u5982\u679c\u53f3\u8868\u6c92\u6709\u5339\u914d\u884c\uff0c\u7d50\u679c\u4e2d\u8a72\u90e8\u5206\u70ba NULL\u3002\u4f8b\uff1a`SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.id;`<br \/>\n&#8211; RIGHT JOIN\uff08\u6216 RIGHT OUTER JOIN\uff09\uff1a \u8fd4\u56de\u53f3\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u4ee5\u53ca\u5de6\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002\u5982\u679c\u5de6\u8868\u6c92\u6709\u5339\u914d\u884c\uff0c\u7d50\u679c\u4e2d\u8a72\u90e8\u5206\u70ba NULL\u3002\u4f8b\uff1a`SELECT * FROM table1 RIGHT JOIN table2 ON table1.id = table2.id;`<br \/>\n&#8211; FULL JOIN\uff08\u6216 FULL OUTER JOIN\uff09\uff1a \u8fd4\u56de\u5169\u500b\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5305\u62ec\u5339\u914d\u548c\u4e0d\u5339\u914d\u7684\u884c\u3002\u4f8b\uff1a`SELECT * FROM table1 FULL JOIN table2 ON table1.id = table2.id;`<\/p>\n<p> 5. \u4f60\u80fd\u89e3\u91cb\u4e00\u4e0b\u4ec0\u9ebc\u662f\u4e8b\u52d9\uff08Transaction\uff09\u55ce\uff1f<\/p>\n<p><strong>\u7bc4\u4f8b\u7b54\u6848<\/strong>\uff1a<br \/>\n\u4e8b\u52d9\uff08Transaction\uff09\u662f\u4e00\u7d44 SQL \u64cd\u4f5c\uff0c\u5b83\u5011\u4f5c\u70ba\u4e00\u500b\u55ae\u4f4d\u57f7\u884c\uff0c\u8981\u9ebc\u5168\u90e8\u6210\u529f\uff0c\u8981\u9ebc\u5168\u90e8\u5931\u6557\u3002\u4e8b\u52d9\u7684\u4e3b\u8981\u7279\u6027\u5305\u62ec\uff1a<\/p>\n<p>&#8211; \u539f\u5b50\u6027\uff08Atomicity\uff09\uff1a \u4e8b\u52d9\u4e2d\u7684\u6240\u6709\u64cd\u4f5c\u8981\u9ebc\u5168\u90e8\u5b8c\u6210\uff0c\u8981\u9ebc\u5168\u90e8\u56de\u6efe\u3002<br \/>\n&#8211; \u4e00\u81f4\u6027\uff08Consistency\uff09\uff1a \u4e8b\u52d9\u57f7\u884c\u5f8c\uff0c\u6578\u64da\u5eab\u5fc5\u9808\u8655\u65bc\u4e00\u81f4\u72c0\u614b\u3002<br \/>\n&#8211; \u9694\u96e2\u6027\uff08Isolation\uff09\uff1a \u4e8b\u52d9\u4e4b\u9593\u7684\u64cd\u4f5c\u4e92\u4e0d\u5e72\u64fe\u3002<br \/>\n&#8211; \u6301\u4e45\u6027\uff08Durability\uff09\uff1a \u4e00\u65e6\u4e8b\u52d9\u63d0\u4ea4\uff0c\u6240\u505a\u7684\u66f4\u6539\u5c07\u6301\u4e45\u4fdd\u5b58\u3002<\/p>\n<p>\u5e38\u7528\u7684\u4e8b\u52d9\u64cd\u4f5c\u5305\u62ec `BEGIN TRANSACTION`\u3001`COMMIT` \u548c `ROLLBACK`\u3002<\/p>\n<p> 6. \u5982\u4f55\u4f7f\u7528 SQL \u5275\u5efa\u4e00\u500b\u65b0\u8868\uff1f<\/p>\n<p><strong>\u7bc4\u4f8b\u7b54\u6848<\/strong>\uff1a<br \/>\n\u53ef\u4ee5\u4f7f\u7528 `CREATE TABLE` \u8a9e\u53e5\u4f86\u5275\u5efa\u4e00\u500b\u65b0\u8868\u3002\u4f8b\u5982\uff1a<\/p>\n<p>&#8220;`sql<br \/>\nCREATE TABLE employees (<br \/>\n    employee_id INT PRIMARY KEY,<br \/>\n    first_name VARCHAR(50),<br \/>\n    last_name VARCHAR(50),<br \/>\n    hire_date DATE,<br \/>\n    salary DECIMAL(10, 2)<br \/>\n);<br \/>\n&#8220;`<\/p>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba `employees` \u7684\u65b0\u8868\uff0c\u5305\u542b\u4e94\u500b\u5217\uff1a`employee_id`\uff08\u6574\u6578\u578b\uff0c\u4e3b\u9375\uff09\uff0c`first_name` \u548c `last_name`\uff08\u8b8a\u9577\u5b57\u7b26\u578b\uff09\uff0c`hire_date`\uff08\u65e5\u671f\u578b\uff09\uff0c\u4ee5\u53ca `salary`\uff08\u5341\u9032\u5236\u578b\uff09\u3002<\/p>\n<p> 7. \u4ec0\u9ebc\u662f\u7d22\u5f15\uff1f\u4f60\u5982\u4f55\u5275\u5efa\u548c\u4f7f\u7528\u7d22\u5f15\uff1f<\/p>\n<p><strong>\u7bc4\u4f8b\u7b54\u6848<\/strong>\uff1a<br \/>\n\u7d22\u5f15\u662f\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u7528\u65bc\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u901f\u5ea6\u3002\u7d22\u5f15\u985e\u4f3c\u65bc\u66f8\u7c4d\u7684\u76ee\u9304\uff0c\u53ef\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002\u5e38\u898b\u7684\u7d22\u5f15\u985e\u578b\u6709\u55ae\u5217\u7d22\u5f15\u548c\u8907\u5408\u7d22\u5f15\u3002<\/p>\n<p>\u5275\u5efa\u7d22\u5f15\u7684\u8a9e\u6cd5\uff1a<\/p>\n<p>&#8220;`sql<br \/>\nCREATE INDEX index_name ON table_name (column_name);<br \/>\n&#8220;`<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<p>&#8220;`sql<br \/>\nCREATE INDEX idx_last_name ON employees (last_name);<br \/>\n&#8220;`<\/p>\n<p>\u9019\u6a23\u6703\u5728 `employees` \u8868\u7684 `last_name` \u5217\u4e0a\u5275\u5efa\u4e00\u500b\u540d\u70ba `idx_last_name` \u7684\u7d22\u5f15\u3002<\/p>\n<p> 8. \u4ec0\u9ebc\u662f\u8996\u5716\uff08View\uff09\uff1f\u5982\u4f55\u5275\u5efa\u548c\u4f7f\u7528\u8996\u5716\uff1f<\/p>\n<p><strong>\u7bc4\u4f8b\u7b54\u6848<\/strong>\uff1a<br \/>\n\u8996\u5716\u662f\u4e00\u500b\u865b\u64ec\u8868\uff0c\u57fa\u65bc\u4e00\u500b\u6216\u591a\u500b\u8868\u7684\u67e5\u8a62\u7d50\u679c\u3002\u8996\u5716\u4e0d\u5b58\u5132\u6578\u64da\u672c\u8eab\uff0c\u800c\u662f\u5b58\u5132\u67e5\u8a62\u3002\u4f7f\u7528\u8996\u5716\u53ef\u4ee5\u7c21\u5316\u8907\u96dc\u7684\u67e5\u8a62\uff0c\u4e26\u589e\u52a0\u6578\u64da\u5b89\u5168\u6027\u3002<\/p>\n<p>\u5275\u5efa\u8996\u5716\u7684\u8a9e\u6cd5\uff1a<\/p>\n<p>&#8220;`sql<br \/>\nCREATE VIEW view_name AS<br \/>\nSELECT column1, column2<br \/>\nFROM table_name<br \/>\nWHERE condition;<br \/>\n&#8220;`<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<p>&#8220;`sql<br \/>\nCREATE VIEW employee_salaries AS<br \/>\nSELECT employee_id, first_name, salary<br \/>\nFROM employees<br \/>\nWHERE salary > 50000;<br \/>\n&#8220;`<\/p>\n<p>\u9019\u6a23\u6703\u5275\u5efa\u4e00\u500b\u540d\u70ba `employee_salaries` \u7684\u8996\u5716\uff0c\u53ea\u986f\u793a\u85aa\u6c34\u8d85\u904e 50000 \u7684\u54e1\u5de5\u4fe1\u606f\u3002<\/p>\n<p> 9. \u5982\u4f55\u4f7f\u7528 SQL \u66f4\u65b0\u8868\u4e2d\u7684\u6578\u64da\uff1f<\/p>\n<p><strong>\u7bc4\u4f8b\u7b54\u6848<\/strong>\uff1a<br \/>\n\u4f7f\u7528 `UPDATE` \u8a9e\u53e5\u53ef\u4ee5\u4fee\u6539\u8868\u4e2d\u7684\u6578\u64da\u3002\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<p>&#8220;`sql<br \/>\nUPDATE table_name<br \/>\nSET column1 = value1, column2 = value2<br \/>\nWHERE condition;<br \/>\n&#8220;`<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<p>&#8220;`sql<br \/>\nUPDATE employees<br \/>\nSET salary = salary * 1.10<br \/>\nWHERE hire_date < '2020-01-01';\n```\n\n\u9019\u6bb5\u4ee3\u78bc\u5c07 `hire_date` \u5728 2020 \u5e74 1 \u6708 1 \u65e5\u4e4b\u524d\u7684\u54e1\u5de5\u85aa\u6c34\u589e\u52a0 10%\u3002\n\n\n\n 10. \u5982\u4f55\u4f7f\u7528 SQL \u522a\u9664\u8868\u4e2d\u7684\u6578\u64da\uff1f\n\n<strong>\u7bc4\u4f8b\u7b54\u6848<\/strong>\uff1a<br \/>\n\u4f7f\u7528 `DELETE` \u8a9e\u53e5\u53ef\u4ee5\u522a\u9664\u8868\u4e2d\u7684\u6578\u64da\u3002\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<p>&#8220;`sql<br \/>\nDELETE FROM table_name<br \/>\nWHERE condition;<br \/>\n&#8220;`<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<p>&#8220;`sql<br \/>\nDELETE FROM employees<br \/>\nWHERE employee_id = 12345;<br \/>\n&#8220;`<\/p>\n<p>\u9019\u6bb5\u4ee3\u78bc\u6703\u522a\u9664 `employee_id` \u70ba 12345 \u7684\u54e1\u5de5\u8a18\u9304\u3002\u6ce8\u610f\uff0c\u4e0d\u4f7f\u7528 `WHERE` \u5b50\u53e5\u6703\u522a\u9664\u8868\u4e2d\u7684\u6240\u6709\u6578\u64da\uff0c\u56e0\u6b64\u9700\u8981\u8b39\u614e\u4f7f\u7528\u3002<\/p>\n<p>\u9019\u4e9b\u554f\u984c\u6db5\u84cb\u4e86 SQL \u958b\u767c\u4eba\u54e1\u7684\u57fa\u672c\u6280\u80fd\u548c\u77e5\u8b58\uff0c\u5e0c\u671b\u5c0d\u4f60\u6709\u6240\u5e6b\u52a9\uff01\u5982\u679c\u6709\u5176\u4ed6\u9700\u6c42\u6216\u60f3\u8981\u66f4\u591a\u7684\u554f\u984c\uff0c\u96a8\u6642\u544a\u8a34\u6211\u3002<\/p>\n<\/div>\n<p><button type=\"button\" id=\"copyquestionsBtn\" onClick=\"myFunction()\">\u8907\u88fd\u9762\u8a66\u554f\u984c<\/button><\/p>\n<h3 id=\"2\">\u7b2c 2 \u90e8\u5206\uff1a\u5617\u8a66\u4f7f\u7528 OnlineExamMaker AI \u554f\u984c\u7522\u751f\u5668\u5efa\u7acb\u6e2c\u9a57\u554f\u984c<\/h3>\n<div class=\"embed_video_blog\">\n<div class=\"embed-responsive embed-responsive-16by9\" style=\"margin-bottom:16px;\">\n <iframe class=\"embed-responsive-item\" src=\"https:\/\/www.youtube.com\/embed\/zlqho9igH2Y\"><\/iframe>\n<\/div>\n<\/div>\n<div class=\"getstarted-container\">\n<p style=\"margin-bottom: 13px;\">\u4f7f\u7528AI\u8a66\u984c\u751f\u6210\u8edf\u9ad4\u81ea\u52d5\u751f\u6210\u6e2c\u9a57\u554f\u984c<\/p>\n<div class=\"blog_double_btn clearfix\">\n<div class=\"col-sm-6  col-xs-12\">\n<div class=\"p-style-a\"><a class=\"get_started_btn\" href=\"https:\/\/onlineexammaker.com\/features\/ai-question-generator.html?refer=download_questions\" target=\"_blank\" rel=\"noopener\">\u8a66\u7528AI\u8a66\u984c\u751f\u6210\u5de5\u5177<\/a><\/div>\n<div class=\"p-style-b\">\u4e00\u9375\u5feb\u901f\u751f\u6210\u8003\u8a66\u8a66\u984c<\/div>\n<\/div>\n<div class=\"col-sm-6  col-xs-12\">\n<div class=\"p-style-a\"><a class=\"get_started_btn\" href=\"https:\/\/onlineexammaker.com\/sign-up.html?refer=blog_btn\"> \u5275\u5efa\u7dda\u4e0a\u6e2c\u9a57<\/a><\/div>\n<div class=\"p-style-b\">\u5f37\u5927\u7dda\u4e0a\u5e73\u53f0\uff0c\u6c38\u4e45\u514d\u8cbb\u8a66\u7528<\/div>\n<\/div>\n<\/div>\n<\/div>\n<h3 id=\"3\">\u7b2c 3 \u90e8\u5206\uff1a\u7528\u65bc\u5de5\u4f5c\u8a55\u4f30\u7684\u514d\u8cbb\u7dda\u4e0a\u6e2c\u9a57\u5275\u5efa\u5668 &#8211; OnlineExamMaker<\/h3>\n<p> OnlineExamMaker \u63d0\u4f9b\u4e86\u4e00\u500b\u4f7f\u7528\u8005\u53cb\u5584\u7684\u4ecb\u9762\uff0c\u7528\u65bc\u5efa\u7acb\u5404\u7a2e\u554f\u984c\u985e\u578b\u7684\u8003\u8a66\uff0c\u5305\u62ec\u591a\u9805\u9078\u64c7\u984c\u3001\u5c0d\u932f\u984c\u548c\u554f\u7b54\u984c\u3002\u5b83\u5141\u8a31\u6559\u5e2b\u5efa\u7acb\u548c\u7ba1\u7406\u554f\u984c\u5eab\uff0c\u4ee5\u4fbf\u65bc\u91cd\u8907\u4f7f\u7528\u548c\u7d44\u7e54\u3002\u5b83\u662f\u8a55\u4f30\u6c42\u8077\u8005\u77e5\u8b58\u548c\u6280\u80fd\u7684\u5b8c\u7f8e\u8a55\u4f30\u5de5\u5177\u3002\u8a72\u8edf\u9ad4\u5305\u62ec\u4e00\u500b\u5167\u5efa\u8a08\u6642\u5668\u529f\u80fd\uff0c\u53ef\u4ee5\u5f37\u5236\u57f7\u884c\u8003\u8a66\u6642\u9593\u9650\u5236\uff0c\u5b83\u53ef\u4ee5\u63a7\u5236\u8003\u8a66\u7684\u958b\u59cb\u548c\u7d50\u675f\u6642\u9593\uff0c\u78ba\u4fdd\u6240\u6709\u53c3\u8207\u8005\u7372\u5f97\u516c\u5e73\u4e14\u4e00\u81f4\u7684\u8003\u8a66\u9ad4\u9a57\u3002<\/p>\n<div class=\"embed_video_blog\">\n<div class=\"embed-responsive embed-responsive-16by9\" style=\"margin-bottom:16px;\">\n <iframe class=\"embed-responsive-item\" src=\"https:\/\/www.youtube.com\/embed\/bv7AAAyFOo4\"><\/iframe>\n<\/div>\n<\/div>\n<div class=\"getstarted-container\">\n<p style=\"margin-bottom: 13px;\">\u7acb\u5373\u9ad4\u9a57 OnlineExamMaker \u7dda\u4e0a\u8003\u8a66\u548c\u6e2c\u9a57\u8edf\u9ad4!<\/p>\n<div class=\"blog_double_btn clearfix\">\n<div class=\"col-sm-6  col-xs-12\">\n<div class=\"p-style-a\"><a class=\"get_started_btn\" href=\"https:\/\/onlineexammaker.com\/sign-up.html?refer=blog_btn_tw\"> SAAS: \u7acb\u5373\u9ad4\u9a57<\/a><\/div>\n<div class=\"p-style-b\">\u6c38\u4e45\u514d\u8cbb\uff0c\u7121\u9700\u4fe1\u7528\u5361<\/div>\n<\/div>\n<div class=\"col-sm-6  col-xs-12\">\n<div class=\"p-style-a\"><a class=\"get_started_btn\" href=\"https:\/\/onlineexammaker.com\/lan.html?refer=blog_btn_tw\">On-Premise: \u514d\u8cbb\u4e0b\u8f09<\/a><\/div>\n<div class=\"p-style-b\">\u81ea\u8a17\u7ba1, 100% \u6578\u64da\u6240\u6709\u6b0a<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><script src=\"https:\/\/unpkg.com\/@popperjs\/core@2\"><\/script><br \/>\n<script src=\"https:\/\/unpkg.com\/tippy.js@6\"><\/script><\/p>\n<p><script type=\"text\/javascript\">\nfunction myFunction() {\nvar copyText = document.getElementById(\"copy_questions\");\n\/\/ Copy the text inside the text field\nconsole.log(copyText.innerText)\nnavigator.clipboard.writeText(copyText.innerText);\n}\nvar copy1, copy2;\n        tippy('#copyquestionsBtn', {\n        'content': \"Copy questions to clipboard\",\n       trigger: 'mouseenter',\n       'onCreate':function(instance){\n              copy1 = instance;\n       },\n       'onTrigger' : function(instance, event) {\n              copy2.hide();\n       }\n       });\n       tippy('#copyquestionsBtn', {\n       'content': \"Copied successfully\",\n       trigger: 'click',\n       'onCreate':function(instance){\n              copy2 = instance;\n       },\n       'onTrigger' : function(instance, event) {\n              copy1.hide();\n       }\n       });\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f5c\u70ba SQL \u958b\u767c\u4eba\u54e1\uff0c\u60a8\u5c07\u8ca0\u8cac\u8a2d\u8a08\u3001\u958b\u767c\u548c\u7dad\u8b77\u516c\u53f8\u6216\u5ba2\u6236\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u3002\u60a8\u7684\u4e3b\u8981\u5de5\u4f5c\u662f\u64b0\u5beb\u548c\u512a\u5316 SQL \u67e5\u8a62\uff0c\u8a2d\u8a08\u6578\u64da\u5eab\u67b6\u69cb\uff0c\u4e26\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u6027\u80fd\u3002\u60a8\u5c07\u8207\u958b\u767c\u4eba\u54e1\u3001\u6578\u64da\u5206\u6790\u5e2b\u548c\u7cfb\u7d71\u7ba1\u7406\u54e1\u5408\u4f5c\uff0c\u78ba\u4fdd\u6578\u64da\u5eab\u80fd\u5920\u652f\u6301\u696d\u52d9\u9700\u6c42\u4e26\u63d0\u9ad8\u6574\u9ad4\u7cfb\u7d71\u6027\u80fd\u3002 \u4e3b\u8981\u8077\u8cac\uff1a \u6578\u64da\u5eab\u8a2d\u8a08\u548c\u5efa\u6a21\uff1a \u8a2d\u8a08\u548c\u5be6\u65bd\u6578\u64da\u5eab\u67b6\u69cb\uff0c\u5efa\u7acb\u548c\u7dad\u8b77\u6578\u64da\u8868\u3001\u7d22\u5f15\u548c\u95dc\u806f\uff0c\u4ee5\u652f\u6301\u61c9\u7528\u7a0b\u5e8f\u548c\u696d\u52d9\u9700\u6c42\u3002 \u64b0\u5beb\u548c\u512a\u5316 SQL \u67e5\u8a62\uff1a \u64b0\u5beb\u9ad8\u6548\u7684 SQL \u67e5\u8a62\u4ee5\u63d0\u53d6\u3001\u63d2\u5165\u3001\u66f4\u65b0\u548c\u522a\u9664\u6578\u64da\uff0c\u4e26\u9032\u884c\u67e5\u8a62\u512a\u5316\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002 \u6578\u64da\u5eab\u7dad\u8b77\uff1a \u76e3\u63a7\u6578\u64da\u5eab\u6027\u80fd\uff0c\u57f7\u884c\u6578\u64da\u5eab\u5099\u4efd\u548c\u6062\u5fa9\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u6027\u548c\u5b8c\u6574\u6027\u3002 \u6578\u64da\u6574\u5408\u548c\u8f49\u63db\uff1a \u4f7f\u7528 SQL \u548c\u5176\u4ed6 ETL \u5de5\u5177\u9032\u884c\u6578\u64da\u6574\u5408\u3001\u8f49\u63db\u548c\u6e05\u7406\uff0c\u4ee5\u652f\u6301\u5831\u544a\u548c\u5206\u6790\u9700\u6c42\u3002 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