{"id":96216,"date":"2024-10-20T07:34:17","date_gmt":"2024-10-19T23:34:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96216\/"},"modified":"2024-10-20T07:34:18","modified_gmt":"2024-10-19T23:34:18","slug":"oracle%e5%84%aa%e5%8c%96sql%e8%aa%9e%e5%8f%a5%e7%9a%84%e5%a5%bd%e8%99%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96216\/","title":{"rendered":"Oracle\u512a\u5316SQL\u8a9e\u53e5\u7684\u597d\u8655"},"content":{"rendered":"

Oracle\u512a\u5316SQL\u8a9e\u53e5\u7684\u597d\u8655<\/h1>\n

\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u5c0d\u65bc\u4f01\u696d\u7684\u904b\u71df\u81f3\u95dc\u91cd\u8981\u3002Oracle\u6578\u64da\u5eab\u4f5c\u70ba\u4e00\u500b\u5f37\u5927\u7684\u6578\u64da\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u5de5\u5177\u548c\u6280\u8853\u4f86\u512a\u5316SQL\u8a9e\u53e5\u3002\u512a\u5316SQL\u8a9e\u53e5\u4e0d\u50c5\u80fd\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u9084\u80fd\u6e1b\u5c11\u8cc7\u6e90\u6d88\u8017\uff0c\u5f9e\u800c\u63d0\u5347\u6574\u9ad4\u7cfb\u7d71\u7684\u6548\u7387\u3002\u672c\u6587\u5c07\u63a2\u8a0eOracle\u512a\u5316SQL\u8a9e\u53e5\u7684\u597d\u8655\u53ca\u5176\u5be6\u73fe\u65b9\u6cd5\u3002<\/p>\n

1. \u63d0\u9ad8\u67e5\u8a62\u6027\u80fd<\/h2>\n

\u512a\u5316SQL\u8a9e\u53e5\u7684\u9996\u8981\u597d\u8655\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u7576SQL\u8a9e\u53e5\u57f7\u884c\u6548\u7387\u4f4e\u4e0b\u6642\uff0c\u6703\u5c0e\u81f4\u67e5\u8a62\u6642\u9593\u5ef6\u9577\uff0c\u5f71\u97ff\u7528\u6236\u9ad4\u9a57\u3002\u901a\u904e\u512a\u5316\uff0c\u53ef\u4ee5\u6e1b\u5c11\u67e5\u8a62\u6240\u9700\u7684\u6642\u9593\u3002\u4f8b\u5982\uff0c\u4f7f\u7528\u9069\u7576\u7684\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u901f\u5ea6\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff1a<\/p>\n

SELECT * FROM employees WHERE department_id = 10;<\/code><\/pre>\n
\u5982\u679c\u5728department_id<\/code>\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u5247\u67e5\u8a62\u6027\u80fd\u5c07\u5927\u5e45\u63d0\u5347\u3002<\/p>\n
2. \u6e1b\u5c11\u8cc7\u6e90\u6d88\u8017<\/h2>\n
\u512a\u5316SQL\u8a9e\u53e5\u9084\u80fd\u6e1b\u5c11\u7cfb\u7d71\u8cc7\u6e90\u7684\u6d88\u8017\u3002\u672a\u7d93\u512a\u5316\u7684\u67e5\u8a62\u53ef\u80fd\u6703\u6d88\u8017\u5927\u91cf\u7684CPU\u548c\u5167\u5b58\u8cc7\u6e90\uff0c\u5c0e\u81f4\u7cfb\u7d71\u6027\u80fd\u4e0b\u964d\u3002\u901a\u904e\u512a\u5316\uff0c\u53ef\u4ee5\u964d\u4f4e\u8cc7\u6e90\u7684\u4f7f\u7528\u7387\uff0c\u5f9e\u800c\u63d0\u9ad8\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u3002\u4f8b\u5982\uff0c\u4f7f\u7528EXPLAIN PLAN<\/code>\u547d\u4ee4\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u4e86\u89e3\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u5f9e\u800c\u627e\u51fa\u6027\u80fd\u74f6\u9838\u3002<\/p>\n
EXPLAIN PLAN FOR SELECT * FROM employees WHERE department_id = 10;<\/code><\/pre>\n
\u9019\u6a23\u53ef\u4ee5\u6e05\u695a\u5730\u770b\u5230\u67e5\u8a62\u7684\u57f7\u884c\u8def\u5f91\uff0c\u4e26\u91dd\u5c0d\u6027\u5730\u9032\u884c\u512a\u5316\u3002<\/p>\n
3. \u63d0\u5347\u6578\u64da\u5eab\u7684\u53ef\u64f4\u5c55\u6027<\/h2>\n
\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u6578\u64da\u5eab\u7684\u53ef\u64f4\u5c55\u6027\u8b8a\u5f97\u5c24\u70ba\u91cd\u8981\u3002\u512a\u5316SQL\u8a9e\u53e5\u53ef\u4ee5\u4f7f\u6578\u64da\u5eab\u5728\u9762\u5c0d\u5927\u91cf\u6578\u64da\u6642\u4ecd\u80fd\u4fdd\u6301\u826f\u597d\u7684\u6027\u80fd\u3002\u901a\u904e\u4f7f\u7528\u805a\u5408\u51fd\u6578\u548c\u5206\u7d44\u67e5\u8a62\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u8655\u7406\u5927\u91cf\u6578\u64da\u3002\u4f8b\u5982\uff1a<\/p>\n
SELECT department_id, COUNT(*) FROM employees GROUP BY department_id;<\/code><\/pre>\n
\u9019\u6a23\u7684\u67e5\u8a62\u80fd\u5920\u5feb\u901f\u7d71\u8a08\u6bcf\u500b\u90e8\u9580\u7684\u54e1\u5de5\u6578\u91cf\uff0c\u4e26\u4e14\u5728\u6578\u64da\u91cf\u589e\u5927\u6642\u4ecd\u80fd\u4fdd\u6301\u9ad8\u6548\u3002<\/p>\n
4. \u6539\u5584\u6578\u64da\u4e00\u81f4\u6027<\/h2>\n
\u512a\u5316SQL\u8a9e\u53e5\u9084\u80fd\u6539\u5584\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002\u901a\u904e\u4f7f\u7528\u4e8b\u52d9\u63a7\u5236\u548c\u9396\u5b9a\u6a5f\u5236\uff0c\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5728\u591a\u7528\u6236\u74b0\u5883\u4e0b\u7684\u4e00\u81f4\u6027\u3002\u4f8b\u5982\uff0c\u4f7f\u7528COMMIT<\/code>\u548cROLLBACK<\/code>\u53ef\u4ee5\u6709\u6548\u7ba1\u7406\u6578\u64da\u7684\u8b8a\u66f4\uff0c\u907f\u514d\u6578\u64da\u4e0d\u4e00\u81f4\u7684\u60c5\u6cc1\u767c\u751f\u3002<\/p>\n
BEGIN TRANSACTION;\nUPDATE employees SET salary = salary * 1.1 WHERE department_id = 10;\nCOMMIT;<\/code><\/pre>\n
\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6240\u6709\u7684\u66f4\u65b0\u64cd\u4f5c\u8981\u9ebc\u5168\u90e8\u6210\u529f\uff0c\u8981\u9ebc\u5168\u90e8\u5931\u6557\uff0c\u5f9e\u800c\u4fdd\u6301\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/p>\n
5. \u964d\u4f4e\u7dad\u8b77\u6210\u672c<\/h2>\n
\u6700\u5f8c\uff0c\u512a\u5316SQL\u8a9e\u53e5\u9084\u80fd\u964d\u4f4e\u6578\u64da\u5eab\u7684\u7dad\u8b77\u6210\u672c\u3002\u512a\u5316\u5f8c\u7684\u67e5\u8a62\u4e0d\u50c5\u57f7\u884c\u66f4\u5feb\uff0c\u9084\u80fd\u6e1b\u5c11\u5c0d\u786c\u4ef6\u8cc7\u6e90\u7684\u9700\u6c42\uff0c\u5f9e\u800c\u964d\u4f4e\u904b\u71df\u6210\u672c\u3002\u9019\u5c0d\u65bc\u4f01\u696d\u4f86\u8aaa\uff0c\u7121\u7591\u662f\u4e00\u500b\u91cd\u8981\u7684\u7d93\u6fdf\u6548\u76ca\u3002<\/p>\n
\u7d50\u8ad6<\/h3>\n
\u7e3d\u4e4b\uff0cOracle\u512a\u5316SQL\u8a9e\u53e5\u7684\u597d\u8655\u4e0d\u5bb9\u5ffd\u8996\u3002\u901a\u904e\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3001\u6e1b\u5c11\u8cc7\u6e90\u6d88\u8017\u3001\u63d0\u5347\u6578\u64da\u5eab\u7684\u53ef\u64f4\u5c55\u6027\u3001\u6539\u5584\u6578\u64da\u4e00\u81f4\u6027\u4ee5\u53ca\u964d\u4f4e\u7dad\u8b77\u6210\u672c\uff0c\u4f01\u696d\u80fd\u5920\u5728\u6fc0\u70c8\u7684\u5e02\u5834\u7af6\u722d\u4e2d\u4fdd\u6301\u512a\u52e2\u3002\u5c0d\u65bc\u5e0c\u671b\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u512a\u5316SQL\u8a9e\u53e5\u662f\u4e00\u500b\u4e0d\u53ef\u6216\u7f3a\u7684\u6b65\u9a5f\u3002<\/p>\n
\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc\u9999\u6e2fVPS<\/a><\/code>\u548c\u96f2\u4f3a\u670d\u5668<\/a><\/code>\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3Oracle\u512a\u5316SQL\u8a9e\u53e5\u7684\u597d\u8655\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\u3001\u6e1b\u5c11\u8cc7\u6e90\u6d88\u8017\uff0c\u78ba\u4fdd\u7cfb\u7d71\u7a69\u5b9a\u6027\u8207\u6027\u80fd\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-96216","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96216","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=96216"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96216\/revisions"}],"predecessor-version":[{"id":96217,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96216\/revisions\/96217"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96216"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96216"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96216"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}