{"id":96160,"date":"2024-10-20T07:06:17","date_gmt":"2024-10-19T23:06:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96160\/"},"modified":"2024-10-20T07:06:18","modified_gmt":"2024-10-19T23:06:18","slug":"oracle%e4%bf%ae%e6%94%b9%e5%ad%97%e6%ae%b5%e9%a1%9e%e5%9e%8b2%e7%a8%ae%e6%96%b9%e6%a1%88%e4%bb%8b%e7%b4%b9","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96160\/","title":{"rendered":"Oracle\u4fee\u6539\u5b57\u6bb5\u985e\u578b2\u7a2e\u65b9\u6848\u4ecb\u7d39"},"content":{"rendered":"

Oracle\u4fee\u6539\u5b57\u6bb5\u985e\u578b2\u7a2e\u65b9\u6848\u4ecb\u7d39<\/h1>\n

\u5728\u4f7f\u7528Oracle\u6578\u64da\u5eab\u7684\u904e\u7a0b\u4e2d\uff0c\u7d93\u5e38\u9700\u8981\u5c0d\u8868\u4e2d\u7684\u5b57\u6bb5\u985e\u578b\u9032\u884c\u4fee\u6539\u3002\u9019\u53ef\u80fd\u662f\u56e0\u70ba\u696d\u52d9\u9700\u6c42\u7684\u8b8a\u66f4\uff0c\u6216\u8005\u662f\u6578\u64da\u7d50\u69cb\u7684\u512a\u5316\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5169\u7a2e\u5e38\u898b\u7684\u65b9\u6848\u4f86\u4fee\u6539Oracle\u6578\u64da\u5eab\u4e2d\u7684\u5b57\u6bb5\u985e\u578b\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u9032\u884c\u6578\u64da\u7ba1\u7406\u3002<\/p>\n

\u65b9\u6848\u4e00\uff1a\u4f7f\u7528ALTER TABLE\u8a9e\u53e5<\/h2>\n

\u6700\u76f4\u63a5\u7684\u65b9\u6cd5\u662f\u4f7f\u7528SQL\u7684ALTER TABLE\u8a9e\u53e5\u4f86\u4fee\u6539\u5b57\u6bb5\u985e\u578b\u3002\u9019\u7a2e\u65b9\u6cd5\u9069\u7528\u65bc\u7c21\u55ae\u7684\u5b57\u6bb5\u985e\u578b\u8b8a\u66f4\uff0c\u4e26\u4e14\u4e0d\u6703\u5f71\u97ff\u5230\u8868\u4e2d\u7684\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u7684\u8a9e\u6cd5\uff1a<\/p>\n

ALTER TABLE \u8868\u540d MODIFY (\u5b57\u6bb5\u540d \u65b0\u985e\u578b);<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba\u201cemployees\u201d\u7684\u8868\uff0c\u4e26\u4e14\u60f3\u5c07\u201csalary\u201d\u5b57\u6bb5\u7684\u985e\u578b\u5f9eNUMBER(10,2)\u4fee\u6539\u70baNUMBER(12,2)\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n
ALTER TABLE employees MODIFY (salary NUMBER(12,2));<\/code><\/pre>\n
\u9019\u7a2e\u65b9\u6cd5\u7684\u512a\u9ede\u662f\u7c21\u55ae\u6613\u61c2\uff0c\u57f7\u884c\u901f\u5ea6\u5feb\uff0c\u9069\u5408\u5c0f\u578b\u6578\u64da\u8868\u7684\u5b57\u6bb5\u985e\u578b\u4fee\u6539\u3002\u7136\u800c\uff0c\u5c0d\u65bc\u5927\u578b\u6578\u64da\u8868\uff0c\u9019\u7a2e\u65b9\u6cd5\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u554f\u984c\uff0c\u56e0\u70ba\u5728\u4fee\u6539\u5b57\u6bb5\u985e\u578b\u6642\uff0cOracle\u9700\u8981\u91cd\u65b0\u6aa2\u67e5\u6574\u500b\u8868\u7684\u6578\u64da\u3002<\/p>\n
\u65b9\u6848\u4e8c\uff1a\u5275\u5efa\u65b0\u8868\u4e26\u8f49\u79fb\u6578\u64da<\/h2>\n
\u5c0d\u65bc\u5927\u578b\u6578\u64da\u8868\u6216\u9700\u8981\u9032\u884c\u8907\u96dc\u5b57\u6bb5\u985e\u578b\u8b8a\u66f4\u7684\u60c5\u6cc1\uff0c\u5efa\u8b70\u4f7f\u7528\u5275\u5efa\u65b0\u8868\u4e26\u8f49\u79fb\u6578\u64da\u7684\u65b9\u6cd5\u3002\u9019\u7a2e\u65b9\u6cd5\u7684\u6b65\u9a5f\u5982\u4e0b\uff1a<\/p>\n
    \n
  1. \u5275\u5efa\u4e00\u500b\u65b0\u7684\u8868\uff0c\u5b57\u6bb5\u985e\u578b\u6839\u64da\u9700\u6c42\u9032\u884c\u8a2d\u7f6e\u3002<\/li>\n
  2. \u5c07\u820a\u8868\u4e2d\u7684\u6578\u64da\u63d2\u5165\u5230\u65b0\u8868\u4e2d\u3002<\/li>\n
  3. \u522a\u9664\u820a\u8868\uff0c\u4e26\u5c07\u65b0\u8868\u91cd\u547d\u540d\u70ba\u820a\u8868\u7684\u540d\u7a31\u3002<\/li>\n<\/ol>\n
    \u4ee5\u4e0b\u662f\u4e00\u500b\u5177\u9ad4\u7684\u793a\u4f8b\uff1a<\/p>\n
    -- \u6b65\u9a5f1: \u5275\u5efa\u65b0\u8868\nCREATE TABLE employees_new (\n    id NUMBER PRIMARY KEY,\n    name VARCHAR2(100),\n    salary NUMBER(12,2)\n);\n\n-- \u6b65\u9a5f2: \u5c07\u820a\u8868\u6578\u64da\u63d2\u5165\u65b0\u8868\nINSERT INTO employees_new (id, name, salary)\nSELECT id, name, salary FROM employees;\n\n-- \u6b65\u9a5f3: \u522a\u9664\u820a\u8868\nDROP TABLE employees;\n\n-- \u6b65\u9a5f4: \u5c07\u65b0\u8868\u91cd\u547d\u540d\nALTER TABLE employees_new RENAME TO employees;<\/code><\/pre>\n
    \u9019\u7a2e\u65b9\u6cd5\u7684\u512a\u9ede\u5728\u65bc\u53ef\u4ee5\u9748\u6d3b\u5730\u4fee\u6539\u591a\u500b\u5b57\u6bb5\u985e\u578b\uff0c\u4e26\u4e14\u4e0d\u6703\u5f71\u97ff\u5230\u539f\u6709\u6578\u64da\u7684\u5b8c\u6574\u6027\u3002\u7136\u800c\uff0c\u9019\u7a2e\u65b9\u6cd5\u9700\u8981\u66f4\u591a\u7684\u64cd\u4f5c\u6b65\u9a5f\uff0c\u4e26\u4e14\u5728\u6578\u64da\u91cf\u8f03\u5927\u6642\uff0c\u53ef\u80fd\u6703\u6d88\u8017\u8f03\u591a\u7684\u6642\u9593\u548c\u8cc7\u6e90\u3002<\/p>\n
    \u7e3d\u7d50<\/h2>\n
    \u5728Oracle\u6578\u64da\u5eab\u4e2d\u4fee\u6539\u5b57\u6bb5\u985e\u578b\u53ef\u4ee5\u901a\u904e\u591a\u7a2e\u65b9\u5f0f\u5be6\u73fe\uff0c\u6700\u5e38\u898b\u7684\u5169\u7a2e\u65b9\u6848\u662f\u4f7f\u7528ALTER TABLE\u8a9e\u53e5\u548c\u5275\u5efa\u65b0\u8868\u4e26\u8f49\u79fb\u6578\u64da\u3002\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\u53d6\u6c7a\u65bc\u5177\u9ad4\u7684\u696d\u52d9\u9700\u6c42\u548c\u6578\u64da\u8868\u7684\u5927\u5c0f\u3002\u7121\u8ad6\u9078\u64c7\u54ea\u7a2e\u65b9\u6848\uff0c\u90fd\u61c9\u5728\u9032\u884c\u64cd\u4f5c\u524d\u505a\u597d\u6578\u64da\u5099\u4efd\uff0c\u4ee5\u9632\u6b62\u6578\u64da\u4e1f\u5931\u3002<\/p>\n
    \u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc\u9999\u6e2fVPS<\/a><\/em>\u548c\u96f2\u4f3a\u670d\u5668<\/a><\/em>\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u63a2\u7d22Oracle\u4e2d\u4fee\u6539\u5b57\u6bb5\u985e\u578b\u7684\u5169\u7a2e\u65b9\u6848\uff0c\u7c21\u5316\u6578\u64da\u5eab\u7ba1\u7406\uff0c\u63d0\u5347\u6548\u7387\uff0c\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u8207\u517c\u5bb9\u6027\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-96160","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96160","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=96160"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96160\/revisions"}],"predecessor-version":[{"id":96161,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96160\/revisions\/96161"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96160"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96160"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96160"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}