{"id":4248,"date":"2019-05-16T18:53:44","date_gmt":"2019-05-16T10:53:44","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=4248"},"modified":"2019-05-17T11:19:19","modified_gmt":"2019-05-17T03:19:19","slug":"like-%e6%9f%a5%e8%af%a2%ef%bc%8c%e7%99%be%e5%88%86%e5%8f%b7%e5%9c%a8%e5%89%8d-xttblog-%e5%88%b0%e5%ba%95%e8%b5%b0%e4%b8%8d%e8%b5%b0%e7%b4%a2%e5%bc%95%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=4248","title":{"rendered":"Like \u67e5\u8be2\uff0c%\u767e\u5206\u53f7\u5728\u524d &#8216;%xttblog&#8217; \u5230\u5e95\u8d70\u4e0d\u8d70\u7d22\u5f15\uff1f"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5176\u5b9e\uff0c\u65e9\u671f\u5173\u6ce8\u6211\u7684\u670b\u53cb\u90fd\u77e5\u9053\uff0c\u6211\u5199\u4e86\u4e00\u4e2a MySQL \u7684 in \u67e5\u8be2\u5230\u5e95\u8d70\u4e0d\u8d70\u7d22\u5f15\u3002\u4eca\u5929\u6211\u4eec\u518d\u6765\u770b\u770b MySQL \u7684 Like \u67e5\u8be2 % \u767e\u5206\u53f7\u5728\u524d\u7684\u60c5\u51b5\u662f\u5426\u4f1a\u8d70\u7d22\u5f15\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u9762\u8bd5\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u4e00\u822c\u90fd\u4f1a\u8bf4 like \u8d70\u7d22\u5f15\u6709\u4e00\u4e2a\u539f\u5219\uff0c\u90a3\u5c31\u662f\u6700\u5de6\u5339\u914d\u539f\u5219\u3002\u90a3\u4e48\u5f53 % \u53f7\u653e\u5728\u6700\u524d\u9762\u7684\u60c5\u51b5\uff0c\u5c31\u4e00\u5b9a\u4e0d\u8d70\u7d22\u5f15\u5417\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u4eec\u901a\u8fc7\u4e00\u4e2a\u4f8b\u5b50\u6765\u770b\u770b\u662f\u5426\u662f\u8fd9\u6837\u7684\u60c5\u51b5\u3002\u793a\u4f8b SQL \u6211\u4e00\u6b21\u6027\u8d34\u51fa\u6765\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>select version(); -- 5.6.41-log\n\ncreate table xttblog_like (\n\tID int primary key,\n\ttest_like VARCHAR(20) NOT NULL DEFAULT 0,\n\tindex test_like(test_like)\n)engine=InnoDB;\n\ninsert into xttblog_like values(1,'\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349'),\n\t(2,'\u5fae\u4fe1\u53f7\uff1axttblog'),\n\t(3,'\u611f\u8c22\u8f6c\u53d1\uff01'),\n\t(4,'MySQL like'),\n\t(5,'MySQL in');\n\nselect * from xttblog_like;\n\nEXPLAIN SELECT * FROM xttblog_like WHERE test_like LIKE 'y'; -- 1\nEXPLAIN SELECT * FROM xttblog_like WHERE test_like LIKE 'y%'; -- 2\nEXPLAIN SELECT * FROM xttblog_like WHERE test_like LIKE '%y'; -- 3\nEXPLAIN SELECT * FROM xttblog_like WHERE test_like LIKE '%y%'; -- 4\nEXPLAIN SELECT * FROM xttblog_like WHERE test_like not LIKE '%y%'; -- 5<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u610f\uff0c\u6211\u7684\u7248\u672c\u662f MySQL 5.6 \u3002\u4e0a\u9762 1 \u5230 5 \u6761\u67e5\u8be2\u7684\u6267\u884c\u8ba1\u5212\u90fd\u662f\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcgy1g33crbqawaj20jf037wey.jpg\" alt=\"\" \/><figcaption>Like \u67e5\u8be2\u8d70\u4e0d\u8d70\u7d22\u5f15<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u6839\u636e\u6211\u524d\u9762\u7684\u8fd9\u7bc7\u6587\u7ae0\u300a<a href=\"https:\/\/www.xttblog.com\/?p=3524\">MySQL \u6027\u80fd\u4f18\u5316\u795e\u5668 Explain \u4f7f\u7528\u6559\u7a0b<\/a>\u300b\u6211\u4eec\u77e5\u9053\uff0c\u4e0a\u9762\u7684\u67e5\u8be2\u90fd\u662f\u7528\u5230\u4e86\u7d22\u5f15\u3002\u4f46\u662f\u6ce8\u610f\u7b2c 3 \u6761\u67e5\u8be2\u4e2d\uff0cpossible_keys \u4e3a null\u3002possible_keys \u4ee3\u8868\u7684\u662f\u6b64\u6b21\u67e5\u8be2\u4e2d\u53ef\u80fd\u9009\u7528\u7684\u7d22\u5f15\uff0c\u90a3\u5c31\u8bf4\u660e\u5c06 % \u653e\u5728\u524d\u9762\u7684 like \u67e5\u8be2\u867d\u7136 type \u548c extra \u663e\u793a\u7684\u90fd\u597d\u50cf\u7528\u4e86\u7d22\u5f15\uff0c\u4f46\u5176\u5b9e possible_keys \u663e\u793a\u7684\u7ed3\u679c\u544a\u8bc9\u6211\u4eec\u5e76\u6ca1\u6709\u4f7f\u7528\u7d22\u5f15\u3002\u4e3a\u4ec0\u4e48\u4f1a\u8fd9\u6837\u5462\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u90a3\u4e48\u6211\u4eec\u73b0\u5728\u5c31\u53ef\u4ee5\u4e0b\u4e00\u4e2a\u7ed3\u8bba\uff0c\u5728 MySQL 5.6 \u7248\u672c\u4e2d\uff0cLike \u67e5\u8be2\uff0c\u5728\u8986\u76d6\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\uff0c\u4e0d\u7ba1\u6709\u6ca1\u6709%\uff0c\u4ee5\u53ca%\u5728\u524d\u8fd8\u662f\u5728\u540e\uff0c\u8fd8\u662f\u524d\u540e\u90fd\u6709\uff0c\u90fd\u4f1a\u8d70\u7d22\u5f15\u3002 not like \u540c\u7406\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f46\u662f\u4f60\u4e5f\u522b\u9ad8\u5174\u7684\u592a\u65e9\u3002\u201c\u7528\u7d22\u5f15\u201d \u548c \u201c\u7528\u7d22\u5f15\u5feb\u901f\u5b9a\u4f4d\u8bb0\u5f55\u201d\u662f\u6709\u533a\u522b\u7684\u3002\u201c\u7528\u7d22\u5f15\u201d\u6709\u4e00\u79cd\u7528\u6cd5\u662f \u201c\u987a\u5e8f\u626b\u63cf\u7d22\u5f15\u201d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Like &#8216;y&#8217; \u6216 \u2018y%&#8217; \u53ef\u4ee5\u4f7f\u7528\u7d22\u5f15\uff0c\u5e76\u4e14\u5feb\u901f\u5b9a\u4f4d\u8bb0\u5f55\u3002like \u2018%y&#8217; \u6216 \u2018%y%&#8217;\uff0c\u53ea\u662f\u5728\u4e8c\u7ea7\u7d22\u5f15\u6811\u4e0a\u904d\u5386\u67e5\u627e\u8bb0\u5f55\uff0c\u5e76\u4e0d\u80fd\u5feb\u901f\u5b9a\u4f4d\uff08\u626b\u63cf\u4e86\u6574\u68f5\u7d22\u5f15\u6811\uff09\u3002\u53ea\u6709 id \u548c test_like \u5b57\u6bb5\u65f6\uff0c\u4e0a\u8ff0 4 \u79cd like \u67e5\u8be2\uff0ctest_like \u7d22\u5f15\u80fd\u6ee1\u8db3 id \u548c test_like \u7684\u67e5\u8be2\u60c5\u51b5\uff0c\u4e0d\u9700\u8981\u56de\u8868\uff0c\u6240\u4ee5\u9009\u62e9\u4e86\u4f7f\u7528 test_like \u7684\u7d22\u5f15\u6811\u89e3\u51b3\u95ee\u9898\u3002\u5982\u679c\u65b0\u6dfb\u52a0\u4e86 xtt \u5b57\u6bb5\uff0c\u4f46\u65e0\u8054\u5408\u7d22\u5f15 (test_like, xtt) \u7684\u60c5\u51b5\uff0c\u5982\u679c\u4f7f\u7528 test_like \u7d22\u5f15\u6811\uff0c\u9700\u8981\u56de\u8868\u3002\u5728 like \u2018%y&#8217; \u6216 \u2018%y%&#8217; \u76f4\u63a5\u626b\u63cf\u4e3b\u952e\u7d22\u5f15\u6811\uff0c\u73b0\u8c61\u5c31\u662f\u6ca1\u6709\u4f7f\u7528 test_like \u7d22\u5f15\u3002\u6dfb\u52a0\u4e86 xtt \u5b57\u6bb5\uff0c\u4e5f\u6dfb\u52a0\u4e86 (test_like, xtt) \u7d22\u5f15\uff0c\u4f7f\u7528\u8986\u76d6\u7d22\u5f15\u5c31\u80fd\u6ee1\u8db3 select * \u7684\u5b57\u6bb5\u67e5\u8be2\uff0c\u4e0d\u9700\u8981\u56de\u8868\uff0c\u56e0\u6b64\u4f7f\u7528\u4e86 (test_like, xtt) \u7d22\u5f15\u6811\u3002\u4f46\u662f\u53ea\u6709 like \u2018y&#8217; \u548c \u2018y%\u2019 \u80fd\u5feb\u901f\u5b9a\u4f4d\u8bb0\u5f55\uff0c\u800c like \u2018%y&#8217; \u548c \u2018%y%&#8217; \u4e5f\u80fd\u4f7f\u7528\u8be5\u7d22\u5f15\u6811\uff0c\u4f46\u662f\u4e0d\u80fd\u5feb\u901f\u5b9a\u4f4d\uff0c\u9700\u8981\u987a\u5e8f\u904d\u5386\u3002 <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5176\u6b21\uff0cindex \u7c7b\u578b\u8868\u793a&#8221;\u548c\u5168\u8868\u626b\u63cf\u4e00\u6837\u3002\u53ea\u662f\u626b\u63cf\u8868\u7684\u65f6\u5019\u6309\u7167\u7d22\u5f15\u6b21\u5e8f\u8fdb\u884c\u800c\u4e0d\u662f\u884c\u3002\u4e3b\u8981\u4f18\u70b9\u5c31\u662f\u907f\u514d\u4e86\u6392\u5e8f, \u4f46\u662f\u5f00\u9500\u4ecd\u7136\u975e\u5e38\u5927\u3002index \u8868\u793a\u6027\u80fd\u5e76\u4e0d\u662f\u7279\u522b\u4f18\u8d8a\uff0csystem &gt; const &gt; eq_ref &gt; ref &gt; fulltext &gt; ref_or_null &gt; index_merge &gt; unique_subquery &gt; index_subquery &gt; range &gt; index &gt; ALL \uff0c\u4e00\u822c\u6765\u8bf4\uff0c\u5f97\u4fdd\u8bc1\u67e5\u8be2\u81f3\u5c11\u8fbe\u5230 range \u7ea7\u522b\uff0c\u6700\u597d\u80fd\u8fbe\u5230 range \u7ea7\u522b\u3002 <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u540e\uff0c\u6211\u4eec\u5728\u6765\u770b\u4e00\u4e0b\u975e\u8986\u76d6\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\u3002\u81f3\u4e8e\u4ec0\u4e48\u662f\u975e\u8986\u76d6\u7d22\u5f15\uff1f\u5c31\u662fselect\u7684\u6570\u636e\u5217\u53ea\u7528\u4ece\u7d22\u5f15\u4e2d\u5c31\u80fd\u591f\u53d6\u5f97\uff0c\u4e0d\u5fc5\u4ece\u6570\u636e\u8868\u4e2d\u8bfb\u53d6\uff0c\u6362\u53e5\u8bdd\u8bf4\u67e5\u8be2\u5217\u8981\u88ab\u6240\u4f7f\u7528\u7684\u7d22\u5f15\u8986\u76d6\u3002\u4e3a\u4e86\u6f14\u793a\u8fd9\u79cd\u60c5\u51b5\uff0c\u6211\u4eec\u6539\u8fdb\u4e00\u4e0b\u6d4b\u8bd5SQL\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>select version(); -- 5.6.41-log\n\ndrop TABLE xttblog_like;\n\ncreate table xttblog_like (\n\tID int primary key,\n\ttest_like VARCHAR(20) NOT NULL DEFAULT 0,\n\tmysql_like VARCHAR(20) NOT NULL DEFAULT 0,\n\tother_like VARCHAR(20) NOT NULL DEFAULT 0,\n\tindex test_like(test_like)\n)engine=InnoDB;\n\ninsert into xttblog_like values(1,'\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349','\u6781\u5ba2\u65f6\u95f4\u8fd4\u73b0','\u6781\u5ba2\u65f6\u95f4\u8fd4\u73b0'),\n\t(2,'\u5fae\u4fe1\u53f7\uff1axttblog','\u5fae\u4fe1\u53f7\uff1axttblog','\u6781\u5ba2\u65f6\u95f4\u8fd4\u73b0'),\n\t(3,'\u611f\u8c22\u8f6c\u53d1\uff01','\u611f\u8c22\u8f6c\u53d1\uff01','\u611f\u8c22\u8f6c\u53d1\uff01'),\n\t(4,'MySQL like','\u6781\u5ba2\u65f6\u95f4\u8fd4\u73b0','\u6781\u5ba2\u65f6\u95f4\u8fd4\u73b0'),\n\t(5,'MySQL in','\u6781\u5ba2\u65f6\u95f4\u8fd4\u73b0','\u6781\u5ba2\u65f6\u95f4\u8fd4\u73b0');\n\nselect * from xttblog_like;\n\nEXPLAIN SELECT * FROM xttblog_like WHERE test_like LIKE 'y'; -- 1\nEXPLAIN SELECT * FROM xttblog_like WHERE test_like LIKE 'y%'; -- 2\nEXPLAIN SELECT * FROM xttblog_like WHERE test_like LIKE '%y'; -- 3\nEXPLAIN SELECT * FROM xttblog_like WHERE test_like LIKE '%y%'; -- 4\nEXPLAIN SELECT * FROM xttblog_like WHERE test_like not LIKE '%y%'; -- 5\nEXPLAIN SELECT id,test_like FROM xttblog_like WHERE test_like LIKE 'y%'; -- 6<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6d4b\u8bd5\u7ed3\u679c\uff0c\u5927\u5bb6\u53ef\u4ee5\u81ea\u5df1\u8fd0\u884c\u4e00\u4e0b\u770b\u770b\u3002\u6211\u76f4\u63a5\u8bf4\u7ed3\u8bba\uff1a\u5728\u975e\u8986\u76d6\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\uff0clike \u67e5\u8be2\u4e2d\uff0c%\u53ea\u8981\u5728\u524d\uff0c\u5c31\u4e0d\u4f1a\u8d70\u7d22\u5f15\uff01\u6240\u4ee5\uff0c\u5927\u5bb6\u4ee5\u540e\u5728\u9047\u5230 MySQL like \u67e5\u8be2\u6700\u5de6\u5339\u914d\uff0c%\u5728\u524d\u7684\u60c5\u51b5\u662f\u5426\u8d70\u7d22\u5f15\u7684\u95ee\u9898\uff0c\u8981\u5206\u60c5\u51b5\u56de\u7b54\uff0c\u4e0d\u8981\u76f4\u63a5\u8bf4\u8d70\u7d22\u5f15\uff0c\u4e5f\u4e0d\u8981\u76f4\u63a5\u8bf4\u4e0d\u8d70\u7d22\u5f15\uff01<\/p>\n<!-- <audio autoplay=\"autoplay\" height=\"100\" width=\"100\" hidden=\"true\"><source src=\"https:\/\/c.coka.la\/orAvPR.mp3\" type=\"audio\/mp3\"\/><\/audio><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/ws3.sinaimg.cn\/large\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/> --><p><!-- <img decoding=\"async\" src=\"https:\/\/raw.githubusercontent.com\/xmt1139057136\/xttblog\/master\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/>--><img decoding=\"async\" src=\"https:\/\/saas.51autoparts.cn\/api\/admin\/sys-file\/oss\/file?fileName=84db51f8561e448f9a4fda2eff0811f9.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/><\/p><p>\u6700\u540e\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349\uff08yyucao\uff09\uff01<b>\u53ef\u52a0\u4f5c\u8005\u5fae\u4fe1\u53f7\uff1a<font color=\"red\">xttblog2<\/font>\u3002\u5907\u6ce8\uff1a\u201c1\u201d\uff0c\u6dfb\u52a0\u535a\u4e3b\u5fae\u4fe1\u62c9\u4f60\u8fdb\u5fae\u4fe1\u7fa4\u3002\u5907\u6ce8\u9519\u8bef\u4e0d\u4f1a\u540c\u610f\u597d\u53cb\u7533\u8bf7\u3002<\/b>\u518d\u6b21\u611f\u8c22\u60a8\u7684\u5173\u6ce8\uff01\u540e\u7eed\u6709\u7cbe\u5f69\u5185\u5bb9\u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u7ed9\u60a8\uff01\u539f\u521b\u6587\u7ae0\u6295\u7a3f\u8bf7\u53d1\u9001\u81f3532009913@qq.com\u90ae\u7bb1\u3002\u5546\u52a1\u5408\u4f5c\u4e5f\u53ef\u6dfb\u52a0\u4f5c\u8005\u5fae\u4fe1\u8fdb\u884c\u8054\u7cfb\uff01<\/p><p>\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a<a href=\"https:\/\/www.xttblog.com\">\u4e1a\u4f59\u8349<\/a>\uff1a &raquo; <a href=\"https:\/\/www.xttblog.com\/?p=4248\">Like \u67e5\u8be2\uff0c%\u767e\u5206\u53f7\u5728\u524d &#8216;%xttblog&#8217; \u5230\u5e95\u8d70\u4e0d\u8d70\u7d22\u5f15\uff1f<\/a><\/p><!-- <div class=\"bd-reward-stl\"><button id=\"bdRewardBtn\"><span><\/span><\/button><\/div> -->","protected":false},"excerpt":{"rendered":"<p>\u5176\u5b9e\uff0c\u65e9\u671f\u5173\u6ce8\u6211\u7684\u670b\u53cb\u90fd\u77e5\u9053\uff0c\u6211\u5199\u4e86\u4e00\u4e2a MySQL \u7684 in \u67e5\u8be2\u5230\u5e95\u8d70\u4e0d\u8d70\u7d22\u5f15\u3002\u4eca\u5929\u6211\u4eec\u518d\u6765\u770b\u770b MySQ [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[83,155,156,1452,918],"class_list":["post-4248","post","type-post","status-publish","format-standard","hentry","category-sql","tag-mysql","tag-sql","tag-156","tag-1452","tag-918"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4248","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4248"}],"version-history":[{"count":3,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4248\/revisions"}],"predecessor-version":[{"id":4252,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4248\/revisions\/4252"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4248"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4248"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4248"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}