{"id":195747,"date":"2024-11-13T17:34:20","date_gmt":"2024-11-13T09:34:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/195747\/"},"modified":"2024-11-13T17:34:21","modified_gmt":"2024-11-13T09:34:21","slug":"%e5%9c%a8oracle-%e5%ad%b8%e7%bf%92%e4%b8%ad%e9%80%b2%e8%a1%8c%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/195747\/","title":{"rendered":"\u5728Oracle \u5b78\u7fd2\u4e2d\u9032\u884c\u6578\u64da\u5eab\u67e5\u8a62"},"content":{"rendered":"

\u5728Oracle\u5b78\u7fd2\u4e2d\u9032\u884c\u6578\u64da\u5eab\u67e5\u8a62<\/h1>\n

\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u67e5\u8a62\u662f\u6578\u64da\u7ba1\u7406\u548c\u5206\u6790\u7684\u91cd\u8981\u7d44\u6210\u90e8\u5206\u3002Oracle\u4f5c\u70ba\u4e00\u500b\u5f37\u5927\u7684\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u8c50\u5bcc\u7684\u67e5\u8a62\u529f\u80fd\uff0c\u5e6b\u52a9\u7528\u6236\u9ad8\u6548\u5730\u6aa2\u7d22\u548c\u64cd\u4f5c\u6578\u64da\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728Oracle\u4e2d\u9032\u884c\u6578\u64da\u5eab\u67e5\u8a62\u7684\u57fa\u672c\u6982\u5ff5\u3001\u8a9e\u6cd5\u4ee5\u53ca\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u3002<\/p>\n

Oracle\u6578\u64da\u5eab\u67e5\u8a62\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n

\u6578\u64da\u5eab\u67e5\u8a62\u662f\u6307\u7528\u6236\u5411\u6578\u64da\u5eab\u767c\u9001\u8acb\u6c42\uff0c\u4ee5\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\u3002Oracle\u4f7f\u7528SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u4f86\u57f7\u884c\u67e5\u8a62\u64cd\u4f5c\u3002SQL\u662f\u4e00\u7a2e\u6a19\u6e96\u5316\u7684\u8a9e\u8a00\uff0c\u5c08\u9580\u7528\u65bc\u7ba1\u7406\u548c\u64cd\u4f5c\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u3002<\/p>\n

\u57fa\u672c\u67e5\u8a62\u8a9e\u6cd5<\/h2>\n

\u5728Oracle\u4e2d\uff0c\u6700\u57fa\u672c\u7684\u67e5\u8a62\u8a9e\u6cd5\u662f\u4f7f\u7528SELECT\u8a9e\u53e5\u3002\u4ee5\u4e0b\u662fSELECT\u8a9e\u53e5\u7684\u57fa\u672c\u7d50\u69cb\uff1a<\/p>\n

SELECT column1, column2, ...\nFROM table_name\nWHERE condition;<\/code><\/pre>\n
\u5728\u9019\u88e1\uff0ccolumn1, column2, ...<\/code>\u662f\u8981\u6aa2\u7d22\u7684\u5217\u540d\uff0ctable_name<\/code>\u662f\u6578\u64da\u8868\u7684\u540d\u7a31\uff0c\u800ccondition<\/code>\u5247\u662f\u904e\u6ffe\u689d\u4ef6\uff0c\u7528\u65bc\u9650\u5236\u67e5\u8a62\u7d50\u679c\u3002<\/p>\n
\u793a\u4f8b\uff1a\u57fa\u672c\u67e5\u8a62<\/h3>\n
\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70baemployees<\/code>\u7684\u8868\uff0c\u5305\u542b\u4ee5\u4e0b\u5217\uff1aemployee_id<\/code>\u3001first_name<\/code>\u3001last_name<\/code>\u548csalary<\/code>\u3002\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u6aa2\u7d22\u6240\u6709\u54e1\u5de5\u7684\u540d\u5b57\u548c\u85aa\u6c34\uff1a<\/p>\n
SELECT first_name, last_name, salary\nFROM employees;<\/code><\/pre>\n
\u4f7f\u7528WHERE\u5b50\u53e5\u9032\u884c\u904e\u6ffe<\/h2>\n
\u70ba\u4e86\u5f9e\u67e5\u8a62\u4e2d\u7372\u53d6\u66f4\u5177\u9ad4\u7684\u6578\u64da\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528WHERE<\/code>\u5b50\u53e5\u4f86\u6dfb\u52a0\u904e\u6ffe\u689d\u4ef6\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u53ea\u60f3\u67e5\u8a62\u85aa\u6c34\u9ad8\u65bc50000\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n
SELECT first_name, last_name, salary\nFROM employees\nWHERE salary > 50000;<\/code><\/pre>\n
\u4f7f\u7528ORDER BY\u9032\u884c\u6392\u5e8f<\/h3>\n
\u9664\u4e86\u904e\u6ffe\u6578\u64da\u5916\uff0c\u6211\u5011\u9084\u53ef\u4ee5\u4f7f\u7528ORDER BY<\/code>\u5b50\u53e5\u4f86\u5c0d\u67e5\u8a62\u7d50\u679c\u9032\u884c\u6392\u5e8f\u3002\u4ee5\u4e0b\u793a\u4f8b\u5c07\u6839\u64da\u85aa\u6c34\u5c0d\u54e1\u5de5\u9032\u884c\u964d\u5e8f\u6392\u5e8f\uff1a<\/p>\n
SELECT first_name, last_name, salary\nFROM employees\nWHERE salary > 50000\nORDER BY salary DESC;<\/code><\/pre>\n
\u805a\u5408\u51fd\u6578\u7684\u4f7f\u7528<\/h2>\n
\u5728\u6578\u64da\u5206\u6790\u4e2d\uff0c\u805a\u5408\u51fd\u6578\u975e\u5e38\u6709\u7528\u3002Oracle\u652f\u6301\u591a\u7a2e\u805a\u5408\u51fd\u6578\uff0c\u5982COUNT<\/code>\u3001SUM<\/code>\u3001AVG<\/code>\u3001MAX<\/code>\u548cMIN<\/code>\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u8a08\u7b97\u6240\u6709\u54e1\u5de5\u7684\u5e73\u5747\u85aa\u6c34\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n
SELECT AVG(salary) AS average_salary\nFROM employees;<\/code><\/pre>\n
GROUP BY\u5b50\u53e5\u7684\u61c9\u7528<\/h3>\n
\u7576\u9700\u8981\u6839\u64da\u67d0\u500b\u5217\u9032\u884c\u5206\u7d44\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528GROUP BY<\/code>\u5b50\u53e5\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u6309\u90e8\u9580\u8a08\u7b97\u6bcf\u500b\u90e8\u9580\u7684\u54e1\u5de5\u6578\u91cf\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n
SELECT department_id, COUNT(*) AS employee_count\nFROM employees\nGROUP BY department_id;<\/code><\/pre>\n
\u7d50\u8ad6<\/h2>\n
\u5728Oracle\u4e2d\u9032\u884c\u6578\u64da\u5eab\u67e5\u8a62\u662f\u4e00\u9805\u57fa\u672c\u800c\u91cd\u8981\u7684\u6280\u80fd\u3002\u901a\u904e\u638c\u63e1SQL\u8a9e\u6cd5\u548c\u67e5\u8a62\u6280\u5de7\uff0c\u7528\u6236\u53ef\u4ee5\u9ad8\u6548\u5730\u6aa2\u7d22\u548c\u5206\u6790\u6578\u64da\u3002\u7121\u8ad6\u662f\u57fa\u672c\u67e5\u8a62\u3001\u904e\u6ffe\u3001\u6392\u5e8f\u9084\u662f\u4f7f\u7528\u805a\u5408\u51fd\u6578\uff0c\u9019\u4e9b\u90fd\u662f\u6578\u64da\u5206\u6790\u904e\u7a0b\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\u3002<\/p>\n
\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728Oracle\u4e2d\u9032\u884c\u6578\u64da\u5eab\u67e5\u8a62\u6709\u9032\u4e00\u6b65\u7684\u8208\u8da3\uff0c\u6216\u8005\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u95dc\u65bc\u9999\u6e2fVPS<\/a><\/code>\u548c\u96f2\u4f3a\u670d\u5668<\/a><\/code>\u7684\u8cc7\u8a0a\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u6e90\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5728Oracle\u5b78\u7fd2\u4e2d\u638c\u63e1\u6578\u64da\u5eab\u67e5\u8a62\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u80fd\u529b\uff0c\u52a9\u529b\u696d\u52d9\u6c7a\u7b56\u8207\u5206\u6790\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-195747","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/195747","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=195747"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/195747\/revisions"}],"predecessor-version":[{"id":195748,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/195747\/revisions\/195748"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=195747"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=195747"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=195747"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}