{"id":200055,"date":"2025-05-06T08:58:10","date_gmt":"2025-05-06T00:58:10","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200055\/"},"modified":"2025-05-06T08:58:10","modified_gmt":"2025-05-06T00:58:10","slug":"mysql%e6%95%b0%e6%8d%ae%e5%ba%93%e4%b8%ad%e7%9a%84unique%e7%b4%a2%e5%bc%95%ef%bc%9a%e7%94%a8%e6%b3%95%e4%b8%8e%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a1%b9","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200055\/","title":{"rendered":"MySQL\u6570\u636e\u5e93\u4e2d\u7684unique\u7d22\u5f15\uff1a\u7528\u6cd5\u4e0e\u6ce8\u610f\u4e8b\u9879"},"content":{"rendered":"

<\/b> <\/p>\n

MySQL\u6570\u636e\u5e93\u4e2d\u7684unique\u7d22\u5f15\uff1a\u7528\u6cd5\u4e0e\u6ce8\u610f\u4e8b\u9879<\/h1>\n

\u4eb2\u7231\u7684\u7f16\u7a0b\u5b66\u4e60\u7231\u597d\u8005\uff0c\u5982\u679c\u4f60\u70b9\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\uff0c\u8bf4\u660e\u4f60\u5bf9\u300aMySQL\u6570\u636e\u5e93\u4e2d\u7684unique\u7d22\u5f15\uff1a\u7528\u6cd5\u4e0e\u6ce8\u610f\u4e8b\u9879\u300b\u5f88\u611f\u5174\u8da3\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u7ed9\u5927\u5bb6\u8be6\u7ec6\u89e3\u6790\u4e00\u4e0b\uff0c\u4e3b\u8981\u4ecb\u7ecd\u4e00\u4e0b\uff0c\u5e0c\u671b\u6240\u6709\u8ba4\u771f\u8bfb\u5b8c\u7684\u7ae5\u978b\u4eec\uff0c\u90fd\u6709\u5b9e\u8d28\u6027\u7684\u63d0\u9ad8\u3002<\/p>\n

MySQL\u6570\u636e\u5e93\u4e2d\u7684unique\u7d22\u5f15\uff1a\u7528\u6cd5\u4e0e\u6ce8\u610f\u4e8b\u9879<\/h2>\n

MySQL\u662f\u4e00\u79cd\u975e\u5e38\u6d41\u884c\u7684\u5f00\u6e90\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u53ef\u4ee5\u7528\u4e8e\u5b58\u50a8\u548c\u7ba1\u7406\u5927\u91cf\u7684\u6570\u636e\u3002\u5728MySQL\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u4f7f\u7528\u7d22\u5f15\u6765\u63d0\u9ad8\u6570\u636e\u7684\u68c0\u7d22\u548c\u63d2\u5165\u6548\u7387\u3002\u5176\u4e2d\uff0cunique\u7d22\u5f15\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u7d22\u5f15\u7c7b\u578b\uff0c\u5b83\u8981\u6c42\u7d22\u5f15\u5217\u7684\u503c\u5728\u6574\u4e2a\u8868\u4e2d\u5fc5\u987b\u662f\u552f\u4e00\u7684\u3002\u672c\u6587\u5c06\u4ecb\u7ecdMySQL\u6570\u636e\u5e93\u4e2dunique\u7d22\u5f15\u7684\u7528\u6cd5\u4e0e\u6ce8\u610f\u4e8b\u9879\uff0c\u5e76\u63d0\u4f9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n

1. \u521b\u5efaunique\u7d22\u5f15<\/h3>\n

\u5728MySQL\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u8868\u7684\u4e00\u4e2a\u6216\u591a\u4e2a\u5217\u4e0a\u521b\u5efaunique\u7d22\u5f15\u3002\u521b\u5efaunique\u7d22\u5f15\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

CREATE UNIQUE INDEX index_name ON table_name (column_name);<\/pre>\n
\u5176\u4e2d\uff0cindex_name<\/code>\u662f\u7d22\u5f15\u7684\u540d\u79f0\uff0ctable_name<\/code>\u662f\u8868\u7684\u540d\u79f0\uff0ccolumn_name<\/code>\u662f\u8981\u521b\u5efaunique\u7d22\u5f15\u7684\u5217\u540d\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u5177\u4f53\u7684\u521b\u5efaunique\u7d22\u5f15\u7684\u793a\u4f8b\uff1a<\/p>\n
CREATE TABLE users (\n    id INT NOT NULL AUTO_INCREMENT,\n    username VARCHAR(50) NOT NULL,\n    email VARCHAR(50) NOT NULL,\n    UNIQUE INDEX unique_email (email)\n);<\/pre>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u521b\u5efa\u4e86\u4e00\u4e2a\u540d\u4e3ausers<\/code>\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542bid<\/code>\u3001username<\/code>\u548cemail<\/code>\u4e09\u4e2a\u5217\uff0c\u540c\u65f6\u5728email<\/code>\u5217\u4e0a\u521b\u5efa\u4e86\u4e00\u4e2a\u540d\u4e3aunique_email<\/code>\u7684unique\u7d22\u5f15\u3002<\/p>\n
2. \u4f7f\u7528unique\u7d22\u5f15<\/h3>\n
\u5f53\u6211\u4eec\u5728\u8868\u4e2d\u521b\u5efa\u4e86unique\u7d22\u5f15\u540e\uff0c\u7cfb\u7edf\u4f1a\u81ea\u52a8\u68c0\u67e5\u8fd9\u4e2a\u7d22\u5f15\u5217\u7684\u503c\u662f\u5426\u552f\u4e00\u3002\u5982\u679c\u6211\u4eec\u5c1d\u8bd5\u5411\u8fd9\u4e2a\u5217\u63d2\u5165\u4e00\u4e2a\u5df2\u7ecf\u5b58\u5728\u7684\u503c\uff0cMySQL\u4f1a\u629b\u51fa\u4e00\u4e2a\u552f\u4e00\u6027\u7ea6\u675f\u9519\u8bef\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u5c1d\u8bd5\u63d2\u5165\u91cd\u590d\u503c\u7684\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n
INSERT INTO users (username, email) \nVALUES ('user1', 'user1@example.com');<\/pre>\n
\u5982\u679cuser1@example.com<\/code>\u5df2\u7ecf\u5b58\u5728\u4e8eemail<\/code>\u5217\u4e2d\uff0c\u4e0a\u9762\u7684\u4ee3\u7801\u5c06\u4f1a\u89e6\u53d1\u4e00\u4e2a\u552f\u4e00\u6027\u7ea6\u675f\u9519\u8bef\u3002<\/p>\n
3. \u6ce8\u610f\u4e8b\u9879<\/h3>\n
\u5728\u4f7f\u7528unique\u7d22\u5f15\u65f6\uff0c\u6709\u4e00\u4e9b\u9700\u8981\u6ce8\u610f\u7684\u4e8b\u9879\uff1a<\/p>\n
    \n
  • \u53ef\u4ee5\u5728\u591a\u4e2a\u5217\u4e0a\u521b\u5efa\u8054\u5408unique\u7d22\u5f15\uff0c\u8fd9\u6837\u8fd9\u51e0\u5217\u7684\u7ec4\u5408\u503c\u5fc5\u987b\u662f\u552f\u4e00\u7684\u3002<\/li>\n
  • \u5220\u9664\u8868\u4e2d\u7684unique\u7d22\u5f15\u53ef\u4ee5\u4f7f\u7528DROP INDEX<\/code>\u8bed\u53e5\u3002<\/li>\n
  • \u5728\u8bbe\u8ba1\u6570\u636e\u5e93\u65f6\uff0c\u5e94\u8be5\u6839\u636e\u5b9e\u9645\u4e1a\u52a1\u9700\u6c42\u6765\u9009\u62e9\u662f\u5426\u9700\u8981\u4f7f\u7528unique\u7d22\u5f15\u3002<\/li>\n<\/ul>\n
    4. \u603b\u7ed3<\/h3>\n
    \u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u4ecb\u7ecd\u4e86MySQL\u6570\u636e\u5e93\u4e2dunique\u7d22\u5f15\u7684\u7528\u6cd5\u4e0e\u6ce8\u610f\u4e8b\u9879\uff0c\u4ee5\u53ca\u63d0\u4f9b\u4e86\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u3002\u901a\u8fc7\u4f7f\u7528unique\u7d22\u5f15\uff0c\u6211\u4eec\u53ef\u4ee5\u786e\u4fdd\u8868\u4e2d\u7684\u67d0\u4e9b\u5217\u7684\u53d6\u503c\u662f\u552f\u4e00\u7684\uff0c\u4ece\u800c\u4fdd\u8bc1\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u5408\u7406\u5730\u4f7f\u7528unique\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u6027\u80fd\u548c\u6570\u636e\u8d28\u91cf\uff0c\u5e2e\u52a9\u6211\u4eec\u66f4\u597d\u5730\u7ba1\u7406\u548c\u7ef4\u62a4\u6570\u636e\u5e93\u3002<\/p>\n
    \u5e0c\u671b\u672c\u6587\u5bf9\u60a8\u4e86\u89e3MySQL\u6570\u636e\u5e93\u4e2d\u7684unique\u7d22\u5f15\u6709\u6240\u5e2e\u52a9\uff0c\u8c22\u8c22\u9605\u8bfb\uff01<\/p>\n
    \u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300aMySQL\u6570\u636e\u5e93\u4e2d\u7684unique\u7d22\u5f15\uff1a\u7528\u6cd5\u4e0e\u6ce8\u610f\u4e8b\u9879\u300b\u7684\u5185\u5bb9\u4e86\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u57fa\u7840\u77e5\u8bc6\u7684\u5b66\u4e60\u548c\u5de9\u56fa\uff0c\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u5c06\u5176\u8fd0\u7528\u5230\u9879\u76ee\u4e2d\uff0c\u6b22\u8fce\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8emysql,\u7d22\u5f15,unique\u7684\u77e5\u8bc6\u70b9\uff01<\/p>\n
    \n
    \n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
    MySQL\u6570\u636e\u5e93\u4e2d\u7684unique...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-200055","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200055","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=200055"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200055\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200055"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200055"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200055"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}