{"id":177201,"date":"2024-11-08T14:11:27","date_gmt":"2024-11-08T06:11:27","guid":{"rendered":"https:\/\/server.hk\/cnblog\/177201\/"},"modified":"2024-11-08T14:11:28","modified_gmt":"2024-11-08T06:11:28","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a41090-sql%e7%8b%80%e6%85%8b%ef%bc%9a42000%ef%bc%88er_cant_remove_all_fields%ef%bc%89%e6%82%a8%e7%84%a1%e6%b3%95%e4%bd%bf%e7%94%a8alter-table","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/177201\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41090 – SQL\u72c0\u614b\uff1a42000\uff08ER_CANT_REMOVE_ALL_FIELDS\uff09\u60a8\u7121\u6cd5\u4f7f\u7528ALTER TABLE\u522a\u9664\u6240\u6709\u5217\uff1b\u4f7f\u7528DROP TABLE\u4ee3\u66ff"},"content":{"rendered":"

\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41090 – SQL\u72c0\u614b\uff1a42000\uff08ER_CANT_REMOVE_ALL_FIELDS\uff09<\/h1>\n

\u5728\u4f7f\u7528MySQL\u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u932f\u8aa41090\uff0c\u8a72\u932f\u8aa4\u7684SQL\u72c0\u614b\u70ba42000\uff0c\u932f\u8aa4\u4fe1\u606f\u70ba\u201c\u60a8\u7121\u6cd5\u4f7f\u7528ALTER TABLE\u522a\u9664\u6240\u6709\u5217\uff1b\u4f7f\u7528DROP TABLE\u4ee3\u66ff\u201d\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u5617\u8a66\u522a\u9664\u8868\u4e2d\u7684\u6240\u6709\u5217\u6642\uff0c\u9019\u5728MySQL\u4e2d\u662f\u4e0d\u88ab\u5141\u8a31\u7684\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u8a72\u932f\u8aa4\u7684\u539f\u56e0\u53ca\u5176\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n

\u932f\u8aa4\u539f\u56e0\u5206\u6790<\/h2>\n

\u7576\u4f60\u5617\u8a66\u4f7f\u7528ALTER TABLE\u8a9e\u53e5\u522a\u9664\u8868\u4e2d\u7684\u6240\u6709\u5217\u6642\uff0cMySQL\u6703\u8fd4\u56de\u932f\u8aa41090\u3002\u9019\u662f\u56e0\u70baMySQL\u4e0d\u5141\u8a31\u4e00\u500b\u8868\u5728\u7d50\u69cb\u4e0a\u5b8c\u5168\u88ab\u6e05\u7a7a\u3002\u9019\u6a23\u7684\u8a2d\u8a08\u662f\u70ba\u4e86\u4fdd\u8b77\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u907f\u514d\u610f\u5916\u522a\u9664\u6240\u6709\u6578\u64da\u3002<\/p>\n

\u4f8b\u5982\uff0c\u4ee5\u4e0b\u7684SQL\u8a9e\u53e5\u6703\u5c0e\u81f4\u932f\u8aa41090\uff1a<\/p>\n

ALTER TABLE my_table\nDROP COLUMN column1,\nDROP COLUMN column2,\nDROP COLUMN column3;\n<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u5047\u8a2dmy_table\u8868\u4e2d\u53ea\u6709column1\u3001column2\u548ccolumn3\u4e09\u500b\u5217\uff0c\u57f7\u884c\u9019\u689d\u8a9e\u53e5\u5c07\u6703\u5f15\u767c\u932f\u8aa41090\u3002<\/p>\n
\u89e3\u6c7a\u65b9\u6848<\/h2>\n
\u8981\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff0c\u958b\u767c\u8005\u6709\u5e7e\u7a2e\u9078\u64c7\uff1a<\/p>\n
1. \u4f7f\u7528DROP TABLE<\/h3>\n
\u5982\u679c\u4f60\u7684\u76ee\u7684\u662f\u5b8c\u5168\u522a\u9664\u8868\u53ca\u5176\u6240\u6709\u6578\u64da\uff0c\u6700\u7c21\u55ae\u7684\u89e3\u6c7a\u65b9\u6848\u662f\u4f7f\u7528DROP TABLE\u8a9e\u53e5\u3002\u9019\u5c07\u6703\u522a\u9664\u6574\u500b\u8868\u53ca\u5176\u7d50\u69cb\u548c\u6578\u64da\uff1a<\/p>\n
DROP TABLE my_table;\n<\/code><\/pre>\n
\u9019\u6a23\u505a\u6703\u6c38\u4e45\u522a\u9664\u8868\uff0c\u56e0\u6b64\u5728\u57f7\u884c\u6b64\u64cd\u4f5c\u4e4b\u524d\uff0c\u8acb\u78ba\u4fdd\u5df2\u7d93\u5099\u4efd\u4e86\u91cd\u8981\u6578\u64da\u3002<\/p>\n
2. \u522a\u9664\u7279\u5b9a\u5217<\/h3>\n
\u5982\u679c\u4f60\u53ea\u60f3\u522a\u9664\u67d0\u4e9b\u5217\uff0c\u800c\u4e0d\u662f\u6574\u500b\u8868\uff0c\u53ef\u4ee5\u4f7f\u7528ALTER TABLE\u8a9e\u53e5\u522a\u9664\u7279\u5b9a\u7684\u5217\u3002\u4f8b\u5982\uff1a<\/p>\n
ALTER TABLE my_table\nDROP COLUMN column1;\n<\/code><\/pre>\n
\u9019\u6a23\u53ef\u4ee5\u9010\u4e00\u522a\u9664\u4e0d\u9700\u8981\u7684\u5217\uff0c\u800c\u4e0d\u6703\u5f15\u767c\u932f\u8aa41090\u3002<\/p>\n
3. \u5275\u5efa\u65b0\u8868<\/h3>\n
\u5982\u679c\u4f60\u9700\u8981\u6e05\u7a7a\u8868\u7684\u6240\u6709\u6578\u64da\u4e26\u91cd\u65b0\u8a2d\u8a08\u7d50\u69cb\uff0c\u53ef\u4ee5\u8003\u616e\u5275\u5efa\u4e00\u500b\u65b0\u8868\uff0c\u7136\u5f8c\u5c07\u6240\u9700\u7684\u6578\u64da\u5f9e\u820a\u8868\u8f49\u79fb\u5230\u65b0\u8868\u4e2d\u3002\u4ee5\u4e0b\u662f\u6b65\u9a5f\uff1a<\/p>\n
    \n
  1. \u5275\u5efa\u65b0\u8868\uff1a<\/li>\n
    CREATE TABLE new_table (\n    new_column1 INT,\n    new_column2 VARCHAR(255)\n    );\n<\/code><\/pre>\n
  2. \u5c07\u6578\u64da\u5f9e\u820a\u8868\u8f49\u79fb\u5230\u65b0\u8868\uff1a<\/li>\n
    INSERT INTO new_table (new_column1, new_column2)\n    SELECT old_column1, old_column2 FROM old_table;\n<\/code><\/pre>\n
  3. \u522a\u9664\u820a\u8868\uff1a<\/li>\n
    DROP TABLE old_table;\n<\/code><\/pre>\n
  4. \u5c07\u65b0\u8868\u91cd\u547d\u540d\u70ba\u820a\u8868\u7684\u540d\u7a31\uff1a<\/li>\n
    RENAME TABLE new_table TO old_table;\n<\/code><\/pre>\n<\/ol>\n
    \u7e3d\u7d50<\/h2>\n
    MySQL\u932f\u8aa41090\u662f\u7531\u65bc\u5617\u8a66\u522a\u9664\u8868\u4e2d\u7684\u6240\u6709\u5217\u800c\u5f15\u767c\u7684\u3002\u89e3\u6c7a\u6b64\u554f\u984c\u7684\u6700\u4f73\u65b9\u6cd5\u662f\u4f7f\u7528DROP TABLE\u8a9e\u53e5\u4f86\u522a\u9664\u6574\u500b\u8868\uff0c\u6216\u8005\u4f7f\u7528ALTER TABLE\u8a9e\u53e5\u9010\u4e00\u522a\u9664\u4e0d\u9700\u8981\u7684\u5217\u3002\u5982\u679c\u9700\u8981\u91cd\u65b0\u8a2d\u8a08\u8868\u7d50\u69cb\uff0c\u5247\u53ef\u4ee5\u5275\u5efa\u65b0\u8868\u4e26\u8f49\u79fb\u6578\u64da\u3002\u4e86\u89e3\u9019\u4e9b\u89e3\u6c7a\u65b9\u6848\u5c07\u6709\u52a9\u65bc\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u7ba1\u7406MySQL\u6578\u64da\u5eab\u3002<\/p>\n
    \u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3\u5982\u4f55\u5728\u9999\u6e2f\u7684VPS\u74b0\u5883\u4e2d\u7ba1\u7406MySQL\u6578\u64da\u5eab\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9 Server.HK<\/a>\uff0c\u6211\u5011\u63d0\u4f9b\u5404\u7a2e \u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u61c9\u5c0d\u5404\u7a2e\u6578\u64da\u5eab\u6311\u6230\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u4fee\u5fa9MySQL\u932f\u8aa41090\u7684\u65b9\u6cd5\uff0c\u4e86\u89e3\u5982\u4f55\u8655\u7406SQL\u72c0\u614b42000\uff08ER_CANT_REMOVE_ALL_FIELDS\uff09\u4e26\u4f7f\u7528DROP TABLE\u66ff\u4ee3ALTER TABLE\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-177201","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/177201","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=177201"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/177201\/revisions"}],"predecessor-version":[{"id":177202,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/177201\/revisions\/177202"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=177201"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=177201"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=177201"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}