{"id":2497,"date":"2021-02-26T22:43:00","date_gmt":"2021-02-26T14:43:00","guid":{"rendered":"https:\/\/www.yumefx.com\/?p=2497"},"modified":"2021-03-01T15:52:22","modified_gmt":"2021-03-01T07:52:22","slug":"mysql%e5%94%af%e4%b8%80%e6%80%a7%e7%b4%a2%e5%bc%95%e4%b8%8e%e4%b8%bb%e9%94%ae","status":"publish","type":"post","link":"https:\/\/www.yumefx.com\/?p=2497","title":{"rendered":"MySQL\u7d22\u5f15\u4e0e\u4e3b\u952e"},"content":{"rendered":"\n<h1 style=\"text-align: center;\">\u7d22\u5f15\u6982\u5ff5<\/h1>\n<p>\u7d22\u5f15\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u6587\u4ef6(InnoDB\u5f15\u64ce\u7684\u6570\u636e\u8868\u4e0a\u7684\u7d22\u5f15\u662f\u8868\u7a7a\u95f4\u7684\u4e00\u4e2a\u7ec4\u6210\u90e8\u5206)\uff0c\u5b83\u4eec\u5305\u542b\u7740\u5bf9\u6570\u636e\u8868\u91cc\u6240\u6709\u8bb0\u5f55\u7684\u5f15\u7528\u6307\u9488\u3002\u66f4\u901a\u4fd7\u7684\u8bf4\uff0c\u6570\u636e\u5e93\u7d22\u5f15\u597d\u6bd4\u662f\u4e00\u672c\u4e66\u524d\u9762\u7684\u76ee\u5f55\uff0c\u80fd\u52a0\u5feb\u6570\u636e\u5e93\u7684\u67e5\u8be2\u901f\u5ea6\u3002<\/p>\n\n\n\n<pre>\n<span>SELECT id,name FROM students WHERE name='zhangsan'<\/span>\n<\/pre>\n\n\n\n<p>\u4e0a\u9762\u8fd9\u4e2a\u67e5\u8be2\u8bed\u53e5\u4e2d\uff0c\u5982\u679c\u8fd9\u4e2astudents\u8868\u6709200\u4e07\u884c\u6570\u636e\uff0c\u5728\u6ca1\u6709\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\uff0c\u6570\u636e\u5e93\u4f1a\u987a\u5e8f\u904d\u5386\u5168\u90e8\u6570\u636e\u540e\u9009\u62e9\u7b26\u5408\u6761\u4ef6\u7684\u6570\u636e\uff0c\u8fd9\u5c06\u5bfc\u81f4\u6d6a\u8d39\u5927\u91cf\u65f6\u95f4\u548c\u6027\u80fd\u3002<\/p>\n<p>\u800c\u7ed9name\u5b57\u6bb5\u8bbe\u7f6e\u7d22\u5f15\u4e4b\u540e\uff0c\u6570\u636e\u5e93\u4f1a\u76f4\u63a5\u5728\u7d22\u5f15\u4e2d\u67e5\u627e\u7b26\u5408\u6761\u4ef6\u7684\u6570\u636e\uff0c\u50cf\u67e5\u5b57\u5178\u4e00\u6837\uff0c\u4ece\u76ee\u5f55\u4e2d\u76f4\u63a5\u627e\u5230\u6570\u636e\u6240\u5728\u7684\u4f4d\u7f6e\uff0c\u8282\u7701\u5927\u91cf\u65f6\u95f4\u548c\u6027\u80fd\u3002<\/p>\n<h3>\u00a0<\/h3>\n<h3>\u805a\u7c07\u7d22\u5f15\u4e0e\u975e\u805a\u7c07\u7d22\u5f15<\/h3>\n<p>\u7d22\u5f15\u5206\u4e3a\u805a\u7c07\u7d22\u5f15\u548c\u975e\u805a\u7c07\u7d22\u5f15\u4e24\u79cd\uff0c\u805a\u7c07\u7d22\u5f15\u662f\u6570\u636e\u5b58\u653e\u65f6\u7684\u987a\u5e8f\u4e0e\u7d22\u5f15\u987a\u5e8f\u76f8\u540c\uff0c\u56e0\u6b64\u4e00\u5f20\u6570\u636e\u8868\u53ea\u5141\u8bb8\u5b58\u5728\u4e00\u4e2a\u805a\u7c07\u7d22\u5f15\uff0c\u53ef\u4ee5\u5b58\u5728\u591a\u4e2a\u975e\u805a\u7c07\u7d22\u5f15\u3002<\/p>\n<p>\u7c7b\u4f3c\u4e8e\u5b57\u5178\u53ea\u80fd\u6709\u4e00\u79cd\u5b9e\u9645\u6392\u5e8f\u65b9\u5f0f\uff0c\u4f46\u6bcf\u4e2a\u4eba\u90fd\u53ef\u4ee5\u5c06\u81ea\u5df1\u5e38\u7528\u7684\u5b57\u4e0e\u9875\u6570\u5355\u72ec\u8bb0\u5728\u4e00\u5f20\u7eb8\u4e0a\uff0c\u67e5\u8be2\u65f6\u4e0d\u5fc5\u67e5\u76ee\u5f55\uff0c\u800c\u662f\u4ece\u8fd9\u5f20\u7eb8\u4e0a\u83b7\u53d6\u3002<\/p>\n<p>\u4e00\u822c\u6570\u636e\u5e93\u9ed8\u8ba4\u90fd\u4f1a\u4e3a\u4e3b\u952e\u751f\u6210\u805a\u7c07\u7d22\u5f15\u3002<\/p>\n<p>\u805a\u7c07\u7d22\u5f15\u80fd\u63d0\u9ad8\u591a\u884c\u68c0\u7d22\u7684\u901f\u5ea6\uff0c\u800c\u975e\u805a\u7c07\u7d22\u5f15\u5bf9\u4e8e\u5355\u884c\u7684\u68c0\u7d22\u5f88\u5feb\u3002<\/p>\n<h1>\u00a0<\/h1>\n<h1 style=\"text-align: center;\">\u7d22\u5f15\u7684\u7c7b\u578b<\/h1>\n<h3>\u666e\u901a\u7d22\u5f15<\/h3>\n<p>\u8fd9\u662f\u6700\u57fa\u672c\u7684\u7d22\u5f15\uff0c\u5b83\u6ca1\u6709\u4efb\u4f55\u9650\u5236\uff0c\u6bd4\u5982\u4e0a\u6587\u4e2d\u4e3atitle\u5b57\u6bb5\u521b\u5efa\u7684\u7d22\u5f15\u5c31\u662f\u4e00\u4e2a\u666e\u901a\u7d22\u5f15\uff0cMyIASM\u4e2d\u9ed8\u8ba4\u7684BTREE\u7c7b\u578b\u7684\u7d22\u5f15\uff0c\u4e5f\u662f\u6211\u4eec\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u7528\u5230\u7684\u7d22\u5f15\u3002<\/p>\n<h5>\u76f4\u63a5\u521b\u5efa\u7d22\u5f15<\/h5>\n\n\n\n<pre>\n<span>#CREATE INDEX index_name ON table_name(column_name(length))<\/span>\n<span>CREATE INDEX nameIndex ON students(name)<\/span>\n<\/pre>\n\n\n\n<h5>\u4fee\u6539\u8868\u7ed3\u6784\u7684\u65b9\u5f0f\u6dfb\u52a0\u7d22\u5f15<\/h5>\n\n\n\n<pre>\n<span>#ALTER TABLE table_name ADD INDEX index_name (column_name(length))<\/span>\n<span>ALTER TABLE students ADD INDEX nameIndex (name)<\/span>\n<\/pre>\n\n\n\n<h5>\u521b\u5efa\u8868\u7684\u65f6\u5019\u540c\u65f6\u521b\u5efa\u7d22\u5f15<\/h5>\n\n\n\n<pre>\n<span>CREATE TABLE `students` (<\/span>\n<span>    `id` int NOT NULL AUTO_INCREMENT ,<\/span>\n<span>    `name` char(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL ,<\/span>\n<span>    PRIMARY KEY (`id`),<\/span>\n<span>    INDEX index_name (name(255))<\/span>\n<span>)<\/span>\n<\/pre>\n\n\n\n<h5>\u67e5\u770b\u8868\u4e2d\u7d22\u5f15<\/h5>\n\n\n\n<pre>\n<span>SHOW INDEX FROM table_name<\/span>\n<\/pre>\n\n\n\n<h5>\u5220\u9664\u7d22\u5f15<\/h5>\n\n\n\n<pre>\n<span>DROP INDEX index_name ON table<\/span>\n<\/pre>\n\n\n\n<h3>\u552f\u4e00\u7d22\u5f15<\/h3>\n<p>\u4e0e\u666e\u901a\u7d22\u5f15\u7c7b\u4f3c\uff0c\u4e0d\u540c\u7684\u5c31\u662f\uff1a\u7d22\u5f15\u5217\u7684\u503c\u5fc5\u987b\u552f\u4e00\uff0c\u4f46\u5141\u8bb8\u6709\u7a7a\u503c\u3002\u5982\u679c\u662f\u7ec4\u5408\u7d22\u5f15\uff0c\u5219\u5217\u503c\u7684\u7ec4\u5408\u5fc5\u987b\u662f\u552f\u4e00\u7684\uff0c\u521b\u5efa\u65b9\u6cd5\u548c\u666e\u901a\u7d22\u5f15\u7c7b\u4f3c\u3002<\/p>\n<h5>\u76f4\u63a5\u521b\u5efa\u7d22\u5f15<\/h5>\n\n\n\n<pre>\n<span>#CREATE UNIQUE INDEX index_name ON table(column(length))<\/span>\n<span>CREATE UNIQUE INDEX nameIndex ON students(name)<\/span>\n<\/pre>\n\n\n\n<h5>\u4fee\u6539\u8868\u7ed3\u6784\u7684\u65b9\u5f0f\u6dfb\u52a0\u7d22\u5f15<\/h5>\n\n\n\n<pre>\n<span>#ALTER TABLE table_name ADD UNIQUE INDEX index_name (column_name(length))<\/span>\n<span>ALTER TABLE students ADD UNIQUE INDEX nameIndex (name)<\/span>\n<\/pre>\n\n\n\n<h5>\u521b\u5efa\u8868\u7684\u65f6\u5019\u540c\u65f6\u521b\u5efa\u7d22\u5f15<\/h5>\n\n\n\n<pre>\n<span>CREATE TABLE `students` (<\/span>\n<span>    `id` int NOT NULL AUTO_INCREMENT ,<\/span>\n<span>    `name` char(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL ,<\/span>\n<span>    PRIMARY KEY (`id`),<\/span>\n<span>    UNIQUE index_name (name(255))<\/span>\n<span>)<\/span>\n<\/pre>\n\n\n\n<h3>\u7ec4\u5408\u7d22\u5f15<\/h3>\n<p>\u5e73\u65f6\u7528\u7684SQL\u67e5\u8be2\u8bed\u53e5\u4e00\u822c\u90fd\u6709\u6bd4\u8f83\u591a\u7684\u9650\u5236\u6761\u4ef6\uff0c\u6240\u4ee5\u4e3a\u4e86\u8fdb\u4e00\u6b65\u69a8\u53d6MySQL\u7684\u6548\u7387\uff0c\u5c31\u8981\u8003\u8651\u5efa\u7acb\u7ec4\u5408\u7d22\u5f15\u3002\u4f8b\u5982\u9488\u5bf9scores\u8868\u7684name\u548cscore\u5b57\u6bb5\u5efa\u7acb\u4e00\u4e2a\u7ec4\u5408\u7d22\u5f15\uff1a<\/p>\n\n\n\n<pre>\n<span>ALTER TABLE scores ADD INDEX index_name_score (name,score)<\/span>\n<\/pre>\n\n\n\n<p>\u5efa\u7acb\u8fd9\u6837\u7684\u7ec4\u5408\u7d22\u5f15\uff0c\u5176\u5b9e\u662f\u76f8\u5f53\u4e8e\u5206\u522b\u5efa\u7acb\u4e86\u4e0b\u9762\u4e24\u7ec4\u7ec4\u5408\u7d22\u5f15\uff1a<\/p>\n\n\n\n<pre>\n<span>\u2013name,score<\/span>\n<span>\u2013name<\/span>\n<\/pre>\n\n\n\n<p>\u4e3a\u4ec0\u4e48\u6ca1\u6709-score\u8fd9\u6837\u7684\u7ec4\u5408\u7d22\u5f15\u5462\uff1f<\/p>\n<p>\u8fd9\u662f\u56e0\u4e3aMySQL\u7ec4\u5408\u7d22\u5f15\u201c<strong>\u6700\u5de6\u524d\u7f00<\/strong>\u201d\u7684\u7ed3\u679c\u3002\u7b80\u5355\u7684\u7406\u89e3\u5c31\u662f\u53ea\u4ece\u6700\u5de6\u9762\u7684\u5f00\u59cb\u7ec4\u5408\u3002\u5e76\u4e0d\u662f\u53ea\u8981\u5305\u542b\u8fd9\u4e24\u5217\u7684\u67e5\u8be2\u90fd\u4f1a\u7528\u5230\u8be5\u7ec4\u5408\u7d22\u5f15\uff0c\u5982\u4e0b\u9762\u7684\u51e0\u4e2aSQL\u6240\u793a\uff1a<\/p>\n<p>\u4f7f\u7528\u5230\u4e0a\u9762\u7684\u7d22\u5f15:<\/p>\n\n\n\n<pre>\n<span>SELECT * FROM scores WHREE name='zhangsan' AND score=100;<\/span>\n<span>SELECT * FROM scores WHREE name='zhangsan';<\/span>\n<\/pre>\n\n\n\n<p>\u672a\u4f7f\u7528\u5230\u4e0a\u9762\u7684\u7d22\u5f15\uff1a<\/p>\n\n\n\n<pre>\n<span>SELECT * FROM scores WHREE score='100';<\/span>\n<\/pre>\n\n\n\n<p>\u4ee5\u4e0a\u5c31\u662f\u5e38\u7528\u7684\u4e09\u79cd\u7d22\u5f15\u7c7b\u578b\u53ca\u5176\u521b\u5efa\u4f7f\u7528\u7684\u65b9\u6cd5\uff0c\u5f53\u7136\u8fd8\u6709\u5176\u4ed6\u7684\u7c7b\u578b\uff0c\u8fd9\u91cc\u4ec5\u5217\u4e3e\u5e73\u65f6\u6700\u5e38\u7528\u7684\u51e0\u79cd\u3002<\/p>\n<h1>\u00a0<\/h1>\n<h1 style=\"text-align: center;\">\u7d22\u5f15\u7684\u4f18\u5316<\/h1>\n<p>\u867d\u7136\u7d22\u5f15\u5927\u5927\u63d0\u9ad8\u4e86\u67e5\u8be2\u901f\u5ea6\uff0c\u540c\u65f6\u5374\u4f1a\u964d\u4f4e\u66f4\u65b0\u8868\u7684\u901f\u5ea6\uff0c\u5982\u5bf9\u8868\u8fdb\u884cINSERT\u3001UPDATE\u548cDELETE\u7b49\u64cd\u4f5c\uff0cMySQL\u4e0d\u4ec5\u8981\u4fee\u6539\u6570\u636e\uff0c\u8fd8\u8981\u4fee\u6539\u4e00\u4e0b\u7d22\u5f15\u6587\u4ef6\uff0c\u7c7b\u4f3c\u4e8e\u5728\u5b57\u5178\u4e2d\u65b0\u589e\u3001\u5220\u9664\u3001\u66f4\u65b0\u5b57\u65f6\uff0c\u5fc5\u987b\u8981\u66f4\u65b0\u76ee\u5f55\u3002<\/p>\n<p>\u53e6\u5916\u5efa\u7acb\u7d22\u5f15\u4f1a\u4f7f\u7d22\u5f15\u6587\u4ef6\u5360\u7528\u78c1\u76d8\u7a7a\u95f4\uff0c\u4e00\u822c\u60c5\u51b5\u8fd9\u4e2a\u95ee\u9898\u4e0d\u592a\u4e25\u91cd\uff0c\u4f46\u5982\u679c\u5728\u4e00\u4e2a\u5927\u8868\u4e0a\u521b\u5efa\u4e86\u591a\u79cd\u7ec4\u5408\u7d22\u5f15\uff0c\u7d22\u5f15\u6587\u4ef6\u7684\u4f1a\u81a8\u80c0\u5f88\u5feb\u3002<\/p>\n<p>\u7d22\u5f15\u53ea\u662f\u63d0\u9ad8\u6548\u7387\u7684\u4e00\u4e2a\u56e0\u7d20\uff0c\u5982\u679cMySQL\u8868\u4e2d\u6709\u5927\u91cf\u6570\u636e\uff0c\u5c31\u9700\u8981\u82b1\u65f6\u95f4\u7814\u7a76\u5efa\u7acb\u6700\u4f18\u79c0\u7684\u7d22\u5f15\uff0c\u6216\u4f18\u5316\u67e5\u8be2\u8bed\u53e5\u3002<\/p>\n<p>\u4e0b\u9762\u662f\u4e00\u4e9b\u603b\u7ed3\u4ee5\u53ca\u6536\u85cf\u7684MySQL\u7d22\u5f15\u7684\u6ce8\u610f\u4e8b\u9879\u548c\u4f18\u5316\u65b9\u6cd5\u3002<\/p>\n<h3>\u00a0<\/h3>\n<h3>1.\u4f55\u65f6\u4f7f\u7528\u805a\u96c6\u7d22\u5f15\u6216\u975e\u805a\u96c6\u7d22\u5f15\uff1f<\/h3>\n<p>\u00a0<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-2508 aligncenter\" src=\"http:\/\/www.yumefx.com\/wp-content\/uploads\/2021\/02\/sqlIndex_02.png\" alt=\"\" width=\"858\" height=\"233\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2021\/02\/sqlIndex_02.png 858w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2021\/02\/sqlIndex_02-300x81.png 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2021\/02\/sqlIndex_02-768x209.png 768w\" sizes=\"(max-width: 858px) 100vw, 858px\" \/><\/p>\n<p>\u4e8b\u5b9e\u4e0a\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u524d\u9762\u805a\u96c6\u7d22\u5f15\u548c\u975e\u805a\u96c6\u7d22\u5f15\u7684\u5b9a\u4e49\u7684\u4f8b\u5b50\u6765\u7406\u89e3\u4e0a\u8868\u3002\u5982\uff1a\u8fd4\u56de\u67d0\u8303\u56f4\u5185\u7684\u6570\u636e\u4e00\u9879\u3002<\/p>\n<p>\u6bd4\u5982\u67d0\u4e2a\u8868\u6709\u4e00\u4e2a\u65f6\u95f4\u5217\uff0c\u6070\u597d\u628a\u805a\u5408\u7d22\u5f15\u5efa\u7acb\u5728\u4e86\u8be5\u5217\uff0c\u8fd9\u65f6\u67e5\u8be22004\u5e741\u67081\u65e5\u81f32004\u5e7410\u67081\u65e5\u4e4b\u95f4\u7684\u5168\u90e8\u6570\u636e\u65f6\uff0c\u8fd9\u4e2a\u901f\u5ea6\u5c31\u5c06\u662f\u5f88\u5feb\u7684\uff0c\u56e0\u4e3a\u8fd9\u672c\u5b57\u5178\u6b63\u6587\u662f\u6309\u65e5\u671f\u8fdb\u884c\u6392\u5e8f\u7684\u3002<\/p>\n<p>\u805a\u7c7b\u7d22\u5f15\u53ea\u9700\u8981\u627e\u5230\u8981\u68c0\u7d22\u7684\u6240\u6709\u6570\u636e\u4e2d\u7684\u5f00\u5934\u548c\u7ed3\u5c3e\u6570\u636e\u5373\u53ef\uff1b\u800c\u4e0d\u50cf\u975e\u805a\u96c6\u7d22\u5f15\uff0c\u5fc5\u987b\u5148\u67e5\u5230\u76ee\u5f55\u4e2d\u67e5\u5230\u6bcf\u4e00\u9879\u6570\u636e\u5bf9\u5e94\u7684\u9875\u7801\uff0c\u7136\u540e\u518d\u6839\u636e\u9875\u7801\u67e5\u5230\u5177\u4f53\u5185\u5bb9\u3002<\/p>\n<h3>\u00a0<\/h3>\n<h3>2.\u7d22\u5f15\u4e0d\u4f1a\u5305\u542b\u6709NULL\u503c\u7684\u5217<\/h3>\n<p>\u53ea\u8981\u5217\u4e2d\u5305\u542b\u6709NULL\u503c\u90fd\u5c06\u4e0d\u4f1a\u88ab\u5305\u542b\u5728\u7d22\u5f15\u4e2d\uff0c\u590d\u5408\u7d22\u5f15\u4e2d\u53ea\u8981\u6709\u4e00\u5217\u542b\u6709NULL\u503c\uff0c\u90a3\u4e48\u8fd9\u4e00\u5217\u5bf9\u4e8e\u6b64\u590d\u5408\u7d22\u5f15\u5c31\u662f\u65e0\u6548\u7684\u3002\u6240\u4ee5\u6211\u4eec\u5728\u6570\u636e\u5e93\u8bbe\u8ba1\u65f6\u4e0d\u8981\u8ba9\u5b57\u6bb5\u7684\u9ed8\u8ba4\u503c\u4e3aNULL\u3002<\/p>\n<h3>\u00a0<\/h3>\n<h3>3.\u4f7f\u7528\u77ed\u7d22\u5f15<\/h3>\n<p>\u5bf9\u4e32\u5217\u8fdb\u884c\u7d22\u5f15\uff0c\u5982\u679c\u53ef\u80fd\u5e94\u8be5\u6307\u5b9a\u4e00\u4e2a\u524d\u7f00\u957f\u5ea6\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6709\u4e00\u4e2aCHAR(255)\u7684\u5217\uff0c\u5982\u679c\u5728\u524d10\u4e2a\u621620\u4e2a\u5b57\u7b26\u5185\uff0c\u591a\u6570\u503c\u662f\u60df\u4e00\u7684\uff0c\u90a3\u4e48\u5c31\u4e0d\u8981\u5bf9\u6574\u4e2a\u5217\u8fdb\u884c\u7d22\u5f15\u3002\u77ed\u7d22\u5f15\u4e0d\u4ec5\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8be2\u901f\u5ea6\u800c\u4e14\u53ef\u4ee5\u8282\u7701\u78c1\u76d8\u7a7a\u95f4\u548cI\/O\u64cd\u4f5c\u3002<\/p>\n<h3>\u00a0<\/h3>\n<h3>4.\u7d22\u5f15\u5217\u6392\u5e8f<\/h3>\n<p>MySQL\u67e5\u8be2\u53ea\u4f7f\u7528\u4e00\u4e2a\u7d22\u5f15\uff0c\u56e0\u6b64\u5982\u679cwhere\u5b50\u53e5\u4e2d\u5df2\u7ecf\u4f7f\u7528\u4e86\u7d22\u5f15\u7684\u8bdd\uff0c\u90a3\u4e48order by\u4e2d\u7684\u5217\u662f\u4e0d\u4f1a\u4f7f\u7528\u7d22\u5f15\u7684\u3002\u56e0\u6b64\u6570\u636e\u5e93\u9ed8\u8ba4\u6392\u5e8f\u53ef\u4ee5\u7b26\u5408\u8981\u6c42\u7684\u60c5\u51b5\u4e0b\u4e0d\u8981\u4f7f\u7528\u6392\u5e8f\u64cd\u4f5c\uff1b\u5c3d\u91cf\u4e0d\u8981\u5305\u542b\u591a\u4e2a\u5217\u7684\u6392\u5e8f\uff0c\u5982\u679c\u9700\u8981\u6700\u597d\u7ed9\u8fd9\u4e9b\u5217\u521b\u5efa\u590d\u5408\u7d22\u5f15\u3002<\/p>\n<h3>\u00a0<\/h3>\n<h3>5.like\u8bed\u53e5\u64cd\u4f5c<\/h3>\n<p>\u4e00\u822c\u60c5\u51b5\u4e0b\u4e0d\u9f13\u52b1\u4f7f\u7528like\u64cd\u4f5c\uff0c\u5982\u679c\u975e\u4f7f\u7528\u4e0d\u53ef\uff0c\u5982\u4f55\u4f7f\u7528\u4e5f\u662f\u4e00\u4e2a\u95ee\u9898\u3002like \u201c%aaa%\u201d \u4e0d\u4f1a\u4f7f\u7528\u7d22\u5f15\u800clike \u201caaa%\u201d\u53ef\u4ee5\u4f7f\u7528\u7d22\u5f15\u3002<\/p>\n<h3>\u00a0<\/h3>\n<h3>6.\u4e0d\u8981\u5728\u5217\u4e0a\u8fdb\u884c\u8fd0\u7b97<\/h3>\n<p>\u4f8b\u5982\uff1aselect * from users where YEAR(adddate)&lt;2007\uff0c\u5c06\u5728\u6bcf\u4e2a\u884c\u4e0a\u8fdb\u884c\u8fd0\u7b97\uff0c\u8fd9\u5c06\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u800c\u8fdb\u884c\u5168\u8868\u626b\u63cf\uff0c\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u6539\u6210\uff1aselect * from users where adddate&lt;\u20192007-01-01\u2032\u3002<\/p>\n<p>\u6700\u540e\u603b\u7ed3\u4e00\u4e0b\uff0cMySQL\u53ea\u5bf9\u4ee5\u4e0b\u64cd\u4f5c\u7b26\u624d\u4f7f\u7528\u7d22\u5f15\uff1a&lt;,&lt;=,=,&gt;,&gt;=,between,in,\u4ee5\u53ca\u67d0\u4e9b\u65f6\u5019\u7684like(\u4e0d\u4ee5\u901a\u914d\u7b26%\u6216_\u5f00\u5934\u7684\u60c5\u5f62)\u3002<\/p>\n<p>\u800c\u7406\u8bba\u4e0a\u6bcf\u5f20\u8868\u91cc\u9762\u6700\u591a\u53ef\u521b\u5efa16\u4e2a\u7d22\u5f15\uff0c\u4e0d\u8fc7\u9664\u975e\u662f\u6570\u636e\u91cf\u771f\u7684\u5f88\u591a\uff0c\u5426\u5219\u8fc7\u591a\u7684\u4f7f\u7528\u7d22\u5f15\u4f1a\u5f15\u8d77\u53cd\u4f5c\u7528\uff0c\u7d22\u5f15\u867d\u597d\u7528\uff0c\u53ef\u4e0d\u8981\u8d2a\u676f\u5662\u3002<\/p>\n<h1>\u00a0<\/h1>\n<h1 id=\"\u552f\u4e00\u6027\u7d22\u5f15unique\u5f71\u54cd\" style=\"text-align: center;\">\u552f\u4e00\u7d22\u5f15\u4e0e\u4e3b\u952e<\/h1>\n<p>\u4ee5\u5982\u4e0b\u6570\u636e\u8868\u4e3a\u4f8b\uff1a<\/p>\n\n\n\n<pre>\n<span>CREATE TABLE `scores` (<\/span>\n<span>    `id` int NOT NULL AUTO_INCREMENT,<\/span>\n<span>    `name` varchar(200) CHARACTER SET utf8 DEFAULT NULL,<\/span>\n<span>    `score` int DEFAULT NULL,<\/span>\n<span>    `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '\u521b\u5efa\u65f6\u95f4',<\/span>\n<span>    `modify_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '\u6700\u540e\u4fee\u6539\u65f6\u95f4',<\/span>\n<span>    PRIMARY KEY (`id`),<\/span>\n<span>    UNIQUE KEY `name` (`name`)<\/span>\n<span>) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='\u5b66\u751f\u5206\u6570\u8868';<\/span>\n<\/pre>\n\n\n\n<p>\u5176\u4e2d\u521b\u5efa\u4e86\u552f\u4e00\u7d22\u5f15name\uff0c\u5728\u8fd9\u4e2a\u8868\u4e2d\u4e0d\u80fd\u5b58\u5728\u91cd\u540d\u5b66\u751f\uff0c\u5728\u63d2\u5165\u91cd\u590dname\u7684\u6570\u636e\u65f6\u4f1a\u62a5\u9519\u3002<\/p>\n<p>\u800c\u5728\u5176\u4e2d\u8fd8\u5b58\u5728\u4e00\u4e2a\u4e3b\u952eid\uff0c\u540c\u6837\u662f\u8868\u4e2d\u552f\u4e00\u4e0d\u80fd\u91cd\u590d\u3002\u5e76\u4e14\u8bbe\u7f6e\u4e86<code>auto_increment<\/code>\u81ea\u589e\uff0c\u5f53\u63d2\u5165\u6570\u636e\u6ca1\u6709\u8bbe\u7f6eid\u65f6\uff0c\u9ed8\u8ba4\u4ece1\u5f00\u59cb\u81ea\u52a8\u6dfb\u52a0\u3002\u800c\u5982\u679c\u63d2\u5165\u7684\u6570\u636e\u5e26\u6709id\u6570\u636e\u65f6\uff0c\u82e5\u8868\u4e2d\u6ca1\u6709\u8be5id\u503c\u5219\u987a\u5229\u63d2\u5165\uff0c\u5982\u679c\u91cd\u590d\u5219\u62a5\u9519\u3002<\/p>\n<h3>\u00a0<\/h3>\n<h3>unique\u4e0eprimary key\u7684\u533a\u522b<\/h3>\n<p>\u7b80\u5355\u6765\u8bf4\uff0cprimary key=unique+not null\u3002<\/p>\n<p>\u5177\u4f53\u7684\u533a\u522b\uff1a<\/p>\n<p>(1) \u552f\u4e00\u7d22\u5f15\u6240\u5728\u7684\u5217\u5141\u8bb8\u7a7a\u503c\uff0c\u4f46\u662f\u4e3b\u952e\u6240\u5728\u7684\u5217\u4e0d\u5141\u8bb8\u7a7a\u503c\u3002<\/p>\n<p>(2) \u53ef\u4ee5\u628a\u552f\u4e00\u7d22\u5f15\u653e\u5728\u4e00\u4e2a\u6216\u8005\u591a\u4e2a\u5217\u4e0a\uff0c\u8fd9\u4e9b\u5217\u6216\u5217\u7684\u7ec4\u5408\u5fc5\u987b\u6709\u552f\u4e00\u7684\u3002\u4f46\u662f\uff0c\u552f\u4e00\u6027\u7d22\u5f15\u6240\u5728\u7684\u5217\u5e76\u4e0d\u662f\u8868\u7684\u4e3b\u952e\u5217\u3002<\/p>\n<p>(3) \u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u521b\u5efa\u552f\u4e00\u7d22\u5f15\u7684\u662f\u975e\u805a\u7c07\u7d22\u5f15\uff0c\u4f46\u662f\uff0c\u5f53\u6ca1\u6709\u8bbe\u7f6e\u4e3b\u952e\u65f6\u4e5f\u53ef\u4ee5\u6307\u5b9a\u6240\u521b\u5efa\u7684\u7d22\u5f15\u662f\u805a\u7c07\u7d22\u5f15\u3002<\/p>\n<p>(4) \u4e00\u4e2a\u8868\u6700\u591a\u53ea\u6709\u4e00\u4e2a\u4e3b\u952e\uff0c\u4f46\u53ef\u4ee5\u6709\u5f88\u591a\u552f\u4e00\u7d22\u5f15<\/p>\n<p>(5) \u5efa\u7acb\u4e3b\u952e\u7684\u76ee\u7684\u662f\u8ba9\u5916\u952e\u6765\u5f15\u7528\uff0c\u56e0\u6b64\u4e3b\u952e\u5e94\u5f53\u662f\u5bf9\u7528\u6237\u6ca1\u6709\u610f\u4e49\u7684\u3002<\/p>\n<p>(6)\u4e3b\u952e\u5e94\u5f53\u7531\u6570\u636e\u5e93\u81ea\u52a8\u751f\u6210\uff0c\u4e0d\u5e94\u8be5\u52a8\u6001\u53d8\u5316\u66f4\u4e0d\u5e94\u8be5\u7528\u6237\u53bb\u66f4\u65b0\u3002<\/p>\n<p>\u00a0<\/p>\n<h1 style=\"text-align: center;\">\u552f\u4e00\u5217\u51b2\u7a81<\/h1>\n<p>\u5f53\u5f80\u6570\u636e\u8868\u4e2d\u63d2\u5165\u6570\u636e\u65f6\u53d1\u73b0\u552f\u4e00\u5217\u91cd\u590d\u5bfc\u81f4\u63d2\u5165\u5931\u8d25\u65f6\uff0c\u6709\u4ee5\u4e0b\u51e0\u79cd\u5904\u7406\u65b9\u6cd5\uff1a<\/p>\n<h3>\u00a0<\/h3>\n<h3>insert ignore<\/h3>\n<p>insert ignore\u4f1a\u8df3\u8fc7\u6570\u636e\u5e93\u4e2d\u5df2\u7ecf\u5b58\u5728\u7684\u6570\u636e\uff08\u6839\u636e\u4e3b\u952e\u548c\u552f\u4e00\u7d22\u5f15\u5224\u65ad\uff09\uff0c\u53ea\u63d2\u5165\u6570\u636e\u5e93\u4e2d\u6ca1\u6709\u7684\u6570\u636e\u3002\u7b80\u800c\u8a00\u4e4b\uff0c\u91cd\u540d\u6570\u636e\u4e0d\u4fee\u6539\u3002<\/p>\n\n\n\n<pre>\n<span>insert ignore into scores (name,score) values ('zhangsan',77)<\/span>\n<span>\/\/Warning: (1062, \"Duplicate entry 'zhangsan' for key 'scores.name'\")<\/span>\n<\/pre>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\u6709\u8b66\u544a\u63d0\u793a\uff0c\u4f46\u5e76\u4e0d\u4f1a\u62a5\u9519\u4e2d\u65ad\uff0c\u4e0d\u5f71\u54cd\u540e\u9762\u5176\u4ed6\u6570\u636e\u7684\u63d2\u5165\u3002<\/p>\n<p>\u867d\u7136\u91cd\u540d\u6570\u636e\u672a\u8fdb\u884c\u4fee\u6539\uff0c\u4f46\u540e\u65b9\u63d2\u5165\u7684\u6570\u636e\u4e3b\u952eid\u7684\u81ea\u589e\u5374\u4f1a\u589e\u52a0\u3002<\/p>\n<h3>\u00a0<\/h3>\n<h3>replace\u00a0into<\/h3>\n<p>replace\u00a0into\u4f1a\u5148\u5220\u9664\u6570\u636e\u5e93\u4e2d\u5df2\u5b58\u5728\u7684\u6570\u636e\uff08\u6839\u636e\u4e3b\u952e\u548c\u552f\u4e00\u7d22\u5f15\u5224\u65ad\uff09\uff0c\u518d\u63d2\u5165\u65b0\u7684\u6570\u636e\u3002\u7b80\u800c\u8a00\u4e4b\uff0c\u91cd\u540d\u6570\u636e\u88ab\u66ff\u6362\u3002<\/p>\n\n\n\n<pre>\n<span>replace\u00a0into scores (name,score) values ('zhangsan',77)<\/span>\n<\/pre>\n\n\n\n<p>\u7531\u4e8e\u6d89\u53ca\u5230\u5220\u9664\u64cd\u4f5c\uff0c\u56e0\u6b64\u64cd\u4f5c\u7528\u6237\u9700\u8981\u6709\u5f53\u524d\u6570\u636e\u8868\u7684delete\u6743\u9650\u3002<\/p>\n<p>\u6570\u636e\u4fee\u6539\u540e\u91cd\u540d\u6570\u636e\u7684\u4e3b\u952eid\u548c\u521b\u5efa\u65f6\u95f4\u90fd\u4f1a\u66f4\u65b0\u5230\u6700\u65b0\uff0c\u56e0\u6b64replace into\u7684\u64cd\u4f5c\u5e76\u4e0d\u662f\u66ff\u6362\u66f4\u65b0\uff0c\u800c\u662f\u5220\u9664\u8ffd\u52a0\u3002<\/p>\n<h3>\u00a0<\/h3>\n<h3 id=\"insert-on-duplicate-key-update\">insert on duplicate key update<\/h3>\n<p>\u5982\u679c\u5728insert into \u8bed\u53e5\u672b\u5c3e\u6307\u5b9a\u4e86<code>on duplicate key update<\/code>\uff0c\u5219\u5728\u51fa\u73b0\u91cd\u590d\u503c\u7684\u884c\u6267\u884cUPDATE\u66f4\u65b0\u3002\u7b80\u800c\u8a00\u4e4b\uff0c\u91cd\u540d\u6570\u636e\u88ab\u66f4\u65b0\u3002<\/p>\n\n\n\n<pre>\n<span>insert into sc (name,score) values ('zhangsan',80) on duplicate key update score=59;<\/span>\n<\/pre>\n\n\n\n<p>\u00a0<\/p>\n<p>\u8fd0\u884c\u540e\uff0czhangsan\u7684score\u5c06\u88ab\u66f4\u65b0\u4e3a59\u5206\uff0c\u4e3b\u952eid\u548c\u521b\u5efa\u65f6\u95f4\u4e0d\u53d8\uff0c\u4fee\u6539\u65f6\u95f4\u53d8\u4e3a\u5f53\u524d\u65f6\u95f4\uff0c\u56e0\u6b64\u8fd9\u79cd\u64cd\u4f5c\u5b9e\u9645\u662f\u5728\u91cd\u540d\u6570\u636e\u4e0a\u8fdb\u884cupdate\u4fee\u6539\u3002<\/p>\n<p>\u4f46\u5373\u4f7f\u662f\u8fd9\u79cd\u4fee\u6539\u66f4\u65b0\u64cd\u4f5c\uff0c\u540c\u6837\u4f1a\u9020\u6210\u4e3b\u952eid\u7684\u81ea\u589e\u589e\u52a0\u3002<\/p>\n<h3>\u00a0<\/h3>\n<h3 style=\"text-align: left;\">\u6b7b\u9501<\/h3>\n<p><code>insert ... on duplicate key<\/code> \u5728\u6267\u884c\u65f6\uff0cinnodb\u5f15\u64ce\u4f1a\u5148\u5224\u65ad\u63d2\u5165\u7684\u884c\u662f\u5426\u4ea7\u751f\u91cd\u590dkey\u9519\u8bef\u3002<\/p>\n<p>\u5982\u679c\u5b58\u5728\uff0c\u5728\u5bf9\u8be5\u73b0\u6709\u7684\u884c\u52a0\u4e0aS(\u5171\u4eab\u9501)\u9501\uff0c\u5982\u679c\u8fd4\u56de\u8be5\u884c\u6570\u636e\u7ed9mysql,\u7136\u540emysql\u6267\u884c\u5b8cduplicate\u540e\u7684update\u64cd\u4f5c\u3002<\/p>\n<p>\u7136\u540e\u5bf9\u8be5\u8bb0\u5f55\u52a0\u4e0aX(\u6392\u4ed6\u9501)\uff0c\u6700\u540e\u8fdb\u884cupdate\u5199\u5165\u3002<\/p>\n<p>\u5982\u679c\u6709\u4e24\u4e2a\u4e8b\u52a1\u5e76\u53d1\u7684\u6267\u884c\u540c\u6837\u7684\u8bed\u53e5\uff0c\u90a3\u4e48\u5c31\u4f1a\u4ea7\u751fdeath lock\u6b7b\u9501\uff0c\u4f8b\u5982<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-2500 aligncenter\" src=\"http:\/\/www.yumefx.com\/wp-content\/uploads\/2021\/02\/mysqlIndex_01.png\" alt=\"\" width=\"1646\" height=\"325\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2021\/02\/mysqlIndex_01.png 1646w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2021\/02\/mysqlIndex_01-300x59.png 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2021\/02\/mysqlIndex_01-1024x202.png 1024w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2021\/02\/mysqlIndex_01-768x152.png 768w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2021\/02\/mysqlIndex_01-1536x303.png 1536w\" sizes=\"(max-width: 1646px) 100vw, 1646px\" \/><\/p>\n<p>\u89e3\u51b3\u529e\u6cd5\uff1a<\/p>\n<ol>\n<li>\u5c3d\u91cf\u5bf9\u5b58\u5728\u591a\u4e2a\u552f\u4e00\u952e\u7684table\u4f7f\u7528\u8be5\u8bed\u53e5<\/li>\n<li>\u5728\u6709\u53ef\u80fd\u6709\u5e76\u53d1\u4e8b\u52a1\u6267\u884c\u7684insert \u7684\u5185\u5bb9\u4e00\u6837\u60c5\u51b5\u4e0b\u4e0d\u4f7f\u7528\u8be5\u8bed\u53e5<\/li>\n<\/ol>\n<p>\u00a0<\/p>\n<p>\u672c\u6587\u8f6c\u8f7d\u81ea<a id=\"uid\" class=\"\" title=\"\u9006\u98ce\u524d\u884c\u7684\u5c0f\u5f3a\" href=\"https:\/\/blog.csdn.net\/dengchenrong\/article\/details\/88425762\" data-report-click=\"{&quot;mod&quot;:&quot;popu_379&quot;,&quot;spm&quot;:&quot;1001.2101.3001.4122&quot;,&quot;dest&quot;:&quot;https:\/\/blog.csdn.net\/dengchenrong&quot;,&quot;ab&quot;:&quot;new&quot;}\"><span class=\"name \">\u9006\u98ce\u524d\u884c\u7684\u5c0f\u5f3a<\/span><\/a>\u548c<a href=\"https:\/\/cnblogs.com\/hongdada\/p\/9970176.html\">hongda&#8217;s blog<\/a>\uff0c\u6709\u6574\u7406\u548c\u4fee\u6539\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>\u4eba\u80fd\u56db\u5904\u8d70\u8d70\uff0c<\/p>\n<p>\u9047\u89c1\u5f62\u5f62\u8272\u8272\u7684\u4eba\u3001\u4e8b\u3001\u7269\uff0c<\/p>\n<p>\u603b\u6bd4\u95f7\u5728\u5bb6\u91cc\u8981\u597d\u3002<\/p>\n<p>\u522b\u8001\u662f\u501f\u53e3\u590f\u5929\u70ed\u3001\u51ac\u5929\u51b7\uff0c<\/p>\n<p>\u591a\u5230\u5916\u9762\u770b\u770b\u53bb\u3002<\/p>\n<p>\u6216\u8bb8\u4f1a\u9047\u4e0a\u8bb8\u8bb8\u591a\u591a\u65b0\u7684\u3001\u65e7\u7684\u56de\u5fc6\u3002<\/p>\n<p style=\"text-align: right;\">\u2014\u2014\u5c9b\u7530\u6d0b\u4e03<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7d22\u5f15\u6982\u5ff5 \u7d22\u5f15\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u6587\u4ef6(InnoDB\u5f15\u64ce\u7684\u6570\u636e\u8868\u4e0a\u7684\u7d22\u5f15\u662f\u8868\u7a7a\u95f4\u7684\u4e00\u4e2a\u7ec4\u6210\u90e8\u5206)\uff0c\u5b83\u4eec\u5305\u542b\u7740\u5bf9\u6570\u636e\u8868\u91cc [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2504,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4,6],"tags":[48,55,15],"_links":{"self":[{"href":"https:\/\/www.yumefx.com\/index.php?rest_route=\/wp\/v2\/posts\/2497"}],"collection":[{"href":"https:\/\/www.yumefx.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yumefx.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yumefx.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yumefx.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2497"}],"version-history":[{"count":0,"href":"https:\/\/www.yumefx.com\/index.php?rest_route=\/wp\/v2\/posts\/2497\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.yumefx.com\/index.php?rest_route=\/wp\/v2\/media\/2504"}],"wp:attachment":[{"href":"https:\/\/www.yumefx.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2497"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yumefx.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2497"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yumefx.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2497"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}