{"id":93760,"date":"2024-10-19T16:41:17","date_gmt":"2024-10-19T08:41:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/93760\/"},"modified":"2024-10-19T16:41:17","modified_gmt":"2024-10-19T08:41:17","slug":"oracle-10g-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e6%89%be%e6%95%b8%e6%93%9a%e7%9a%84%e6%96%b9%e6%b3%95%e7%b8%bd%e7%b5%90","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/93760\/","title":{"rendered":"Oracle 10g \u6578\u64da\u5eab\u67e5\u627e\u6578\u64da\u7684\u65b9\u6cd5\u7e3d\u7d50"},"content":{"rendered":"

Oracle 10g \u6578\u64da\u5eab\u67e5\u627e\u6578\u64da\u7684\u65b9\u6cd5\u7e3d\u7d50<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u67e5\u627e\u6578\u64da\u662f\u6700\u57fa\u672c\u4e5f\u662f\u6700\u91cd\u8981\u7684\u64cd\u4f5c\u4e4b\u4e00\u3002Oracle 10g \u4f5c\u70ba\u4e00\u6b3e\u6210\u719f\u7684\u6578\u64da\u5eab\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u67e5\u627e\u6578\u64da\u7684\u65b9\u6cd5\u3002\u672c\u6587\u5c07\u7e3d\u7d50\u5e7e\u7a2e\u5e38\u7528\u7684\u67e5\u627e\u6578\u64da\u65b9\u6cd5\uff0c\u5e6b\u52a9\u7528\u6236\u66f4\u6709\u6548\u5730\u5f9e\u6578\u64da\u5eab\u4e2d\u6aa2\u7d22\u6240\u9700\u7684\u4fe1\u606f\u3002<\/p>\n

1. \u4f7f\u7528 SELECT \u8a9e\u53e5<\/h2>\n

\u6700\u57fa\u672c\u7684\u67e5\u627e\u6578\u64da\u65b9\u6cd5\u662f\u4f7f\u7528 SELECT<\/code> \u8a9e\u53e5\u3002\u9019\u500b\u8a9e\u53e5\u53ef\u4ee5\u7528\u4f86\u5f9e\u4e00\u500b\u6216\u591a\u500b\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n

SELECT column1, column2, ...\nFROM table_name\nWHERE condition;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u5f9e\u540d\u70ba employees<\/code> \u7684\u8868\u4e2d\u67e5\u627e\u6240\u6709\u54e1\u5de5\u7684\u59d3\u540d\u548c\u5de5\u8cc7\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n
SELECT name, salary\nFROM employees;<\/code><\/pre>\n
2. \u4f7f\u7528 WHERE \u5b50\u53e5<\/h2>\n
\u5728\u67e5\u627e\u6578\u64da\u6642\uff0cWHERE<\/code> \u5b50\u53e5\u53ef\u4ee5\u7528\u4f86\u6307\u5b9a\u67e5\u8a62\u689d\u4ef6\uff0c\u5f9e\u800c\u904e\u6ffe\u51fa\u7b26\u5408\u689d\u4ef6\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u627e\u5de5\u8cc7\u9ad8\u65bc 50000 \u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n
SELECT name, salary\nFROM employees\nWHERE salary > 50000;<\/code><\/pre>\n
3. \u4f7f\u7528 LIKE \u64cd\u4f5c\u7b26<\/h2>\n
\u7576\u9700\u8981\u67e5\u627e\u7b26\u5408\u7279\u5b9a\u6a21\u5f0f\u7684\u6578\u64da\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528 LIKE<\/code> \u64cd\u4f5c\u7b26\u3002\u9019\u5728\u67e5\u627e\u5b57\u7b26\u4e32\u6642\u7279\u5225\u6709\u7528\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u627e\u6240\u6709\u4ee5 “J” \u958b\u982d\u7684\u54e1\u5de5\u59d3\u540d\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n
SELECT name\nFROM employees\nWHERE name LIKE 'J%';<\/code><\/pre>\n
4. \u4f7f\u7528 JOIN \u8a9e\u53e5<\/h2>\n
\u5728\u591a\u500b\u8868\u4e4b\u9593\u67e5\u627e\u6578\u64da\u6642\uff0cJOIN<\/code> \u8a9e\u53e5\u662f\u975e\u5e38\u6709\u7528\u7684\u3002\u5b83\u53ef\u4ee5\u5c07\u4f86\u81ea\u4e0d\u540c\u8868\u7684\u6578\u64da\u6839\u64da\u67d0\u4e9b\u689d\u4ef6\u9032\u884c\u806f\u63a5\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528\u5167\u90e8\u806f\u63a5\u7684\u793a\u4f8b\uff1a<\/p>\n
SELECT e.name, d.department_name\nFROM employees e\nJOIN departments d ON e.department_id = d.id;<\/code><\/pre>\n
5. \u4f7f\u7528\u805a\u5408\u51fd\u6578<\/h2>\n
\u5728\u67e5\u627e\u6578\u64da\u6642\uff0c\u6709\u6642\u9700\u8981\u5c0d\u6578\u64da\u9032\u884c\u7d71\u8a08\u5206\u6790\u3002Oracle 10g \u63d0\u4f9b\u4e86\u591a\u7a2e\u805a\u5408\u51fd\u6578\uff0c\u5982 COUNT<\/code>\u3001SUM<\/code>\u3001AVG<\/code> \u7b49\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u8a08\u7b97\u6240\u6709\u54e1\u5de5\u7684\u5e73\u5747\u5de5\u8cc7\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n
SELECT AVG(salary)\nFROM employees;<\/code><\/pre>\n
6. \u4f7f\u7528\u5b50\u67e5\u8a62<\/h2>\n
\u5b50\u67e5\u8a62\u662f\u6307\u5728\u4e00\u500b\u67e5\u8a62\u4e2d\u5d4c\u5957\u53e6\u4e00\u500b\u67e5\u8a62\u3002\u9019\u5728\u9700\u8981\u6839\u64da\u5176\u4ed6\u67e5\u8a62\u7684\u7d50\u679c\u4f86\u904e\u6ffe\u6578\u64da\u6642\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u627e\u5de5\u8cc7\u9ad8\u65bc\u5e73\u5747\u5de5\u8cc7\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n
SELECT name\nFROM employees\nWHERE salary > (SELECT AVG(salary) FROM employees);<\/code><\/pre>\n
7. \u4f7f\u7528\u7d22\u5f15\u63d0\u9ad8\u67e5\u8a62\u6548\u7387<\/h2>\n
\u5728\u67e5\u627e\u5927\u91cf\u6578\u64da\u6642\uff0c\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u901a\u904e\u5728\u8868\u7684\u67d0\u4e9b\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002\u5275\u5efa\u7d22\u5f15\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n
CREATE INDEX index_name\nON table_name (column1, column2, ...);<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u5728 employees<\/code> \u8868\u7684 salary<\/code> \u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n
CREATE INDEX idx_salary\nON employees (salary);<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
Oracle 10g \u63d0\u4f9b\u4e86\u591a\u7a2e\u67e5\u627e\u6578\u64da\u7684\u65b9\u6cd5\uff0c\u5305\u62ec\u4f7f\u7528 SELECT<\/code> \u8a9e\u53e5\u3001WHERE<\/code> \u5b50\u53e5\u3001LIKE<\/code> \u64cd\u4f5c\u7b26\u3001JOIN<\/code> \u8a9e\u53e5\u3001\u805a\u5408\u51fd\u6578\u3001\u5b50\u67e5\u8a62\u4ee5\u53ca\u7d22\u5f15\u7b49\u3002\u9019\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u66f4\u9ad8\u6548\u5730\u5f9e\u6578\u64da\u5eab\u4e2d\u6aa2\u7d22\u6240\u9700\u7684\u4fe1\u606f\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u5c07\u662f\u63d0\u5347\u6027\u80fd\u7684\u95dc\u9375\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u7e3d\u7d50Oracle 10g\u6578\u64da\u5eab\u67e5\u627e\u6578\u64da\u7684\u65b9\u6cd5\uff0c\u6db5\u84cb\u67e5\u8a62\u8a9e\u53e5\u3001\u7d22\u5f15\u4f7f\u7528\u53ca\u6700\u4f73\u5be6\u8e10\uff0c\u63d0\u5347\u6578\u64da\u6aa2\u7d22\u6548\u7387\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-93760","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/93760","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=93760"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/93760\/revisions"}],"predecessor-version":[{"id":93761,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/93760\/revisions\/93761"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=93760"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=93760"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=93760"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}