{"id":6405,"date":"2024-11-14T13:08:58","date_gmt":"2024-11-14T05:08:58","guid":{"rendered":"https:\/\/fwq.ai\/blog\/6405\/"},"modified":"2024-11-14T13:08:58","modified_gmt":"2024-11-14T05:08:58","slug":"mysql%e6%88%aa%e5%8f%96%e5%ad%97%e7%ac%a6%e4%b8%b2%e7%9a%84%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/6405\/","title":{"rendered":"mysql\u622a\u53d6\u5b57\u7b26\u4e32\u7684\u51fd\u6570"},"content":{"rendered":"<blockquote><p>\n  mysql \u63d0\u4f9b\u4ee5\u4e0b\u622a\u53d6\u5b57\u7b26\u4e32\u51fd\u6570\uff1a1. substring(str, start, length)\uff1b2. left(str, length)\uff1b3. right(str, length)\u3002\u793a\u4f8b\uff1a\u622a\u53d6 &#8220;hello world&#8221; \u7684\u524d 5 \u4e2a\u5b57\u7b26\uff1asubstring(&#8220;hello world&#8221;, 1, 5)\uff1b\u622a\u53d6 &#8220;hello world&#8221; \u7684\u524d 3 \u4e2a\u5b57\u7b26\uff1aleft(&#8220;hello world&#8221;, 3)\uff1b\u622a\u53d6 &#8220;hello world&#8221; \u7684\u540e 3 \u4e2a\u5b57\u7b26\uff1aright(&#8220;hello world&#8221;,\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202408\/01\/2024080121365577132.jpg\" class=\"aligncenter\" title=\"mysql\u622a\u53d6\u5b57\u7b26\u4e32\u7684\u51fd\u6570\u63d2\u56fe\" alt=\"mysql\u622a\u53d6\u5b57\u7b26\u4e32\u7684\u51fd\u6570\u63d2\u56fe\" \/><\/p>\n<p><strong>MySQL \u622a\u53d6\u5b57\u7b26\u4e32\u7684\u51fd\u6570<\/strong><\/p>\n<p>MySQL \u63d0\u4f9b\u4e86\u4ee5\u4e0b\u51fd\u6570\u6765\u622a\u53d6\u5b57\u7b26\u4e32\uff1a<\/p>\n<p><strong>SUBSTRING \u51fd\u6570<\/strong><\/p>\n<p>SUBSTRING(str, start, length)<\/p>\n<ul>\n<li>str\uff1a\u8981\u622a\u53d6\u7684\u5b57\u7b26\u4e32\u3002<\/li>\n<li>start\uff1a\u8981\u5f00\u59cb\u622a\u53d6\u7684\u5b57\u7b26\u4f4d\u7f6e\uff08\u4ece 1 \u5f00\u59cb\uff09\u3002<\/li>\n<li>length\uff1a\u8981\u622a\u53d6\u7684\u5b57\u7b26\u6570\u3002<\/li>\n<\/ul>\n<p><strong>LEFT \u51fd\u6570<\/strong><\/p>\n<p>LEFT(str, length)<\/p>\n<ul>\n<li>str\uff1a\u8981\u622a\u53d6\u7684\u5b57\u7b26\u4e32\u3002<\/li>\n<li>length\uff1a\u8981\u622a\u53d6\u7684\u5b57\u7b26\u6570\uff08\u4ece\u5de6\u5f00\u59cb\uff09\u3002<\/li>\n<\/ul>\n<p><strong>RIGHT \u51fd\u6570<\/strong><\/p>\n<p>RIGHT(str, length)<\/p>\n<ul>\n<li>str\uff1a\u8981\u622a\u53d6\u7684\u5b57\u7b26\u4e32\u3002<\/li>\n<li>length\uff1a\u8981\u622a\u53d6\u7684\u5b57\u7b26\u6570\uff08\u4ece\u53f3\u5f00\u59cb\uff09\u3002<\/li>\n<\/ul>\n<p><strong>\u4f8b\u5b50<\/strong><\/p>\n<p><strong>\u4f7f\u7528 SUBSTRING \u51fd\u6570<\/strong><\/p>\n<p>\u622a\u53d6\u5b57\u7b26\u4e32 &#8220;Hello World&#8221; \u4e2d\u7b2c\u4e00\u4e2a\u5230\u7b2c\u4e94\u4e2a\u5b57\u7b26\uff1a<\/p>\n<pre>SELECT SUBSTRING(\"Hello World\", 1, 5);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u7ed3\u679c\uff1a&#8221;Hello&#8221;<\/p>\n<p><strong>\u4f7f\u7528 LEFT \u51fd\u6570<\/strong><\/p>\n<p>\u622a\u53d6\u5b57\u7b26\u4e32 &#8220;Hello World&#8221; \u4e2d\u7684\u524d\u4e09\u4e2a\u5b57\u7b26\uff1a<\/p>\n<pre>SELECT LEFT(\"Hello World\", 3);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u7ed3\u679c\uff1a&#8221;Hel&#8221;<\/p>\n<p><strong>\u4f7f\u7528 RIGHT \u51fd\u6570<\/strong><\/p>\n<p>\u622a\u53d6\u5b57\u7b26\u4e32 &#8220;Hello World&#8221; \u4e2d\u7684\u540e\u4e09\u4e2a\u5b57\u7b26\uff1a<\/p>\n<pre>SELECT RIGHT(\"Hello World\", 3);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u7ed3\u679c\uff1a&#8221;rld&#8221;<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u622a\u53d6\u5b57\u7b26\u4e32\u7684\u51fd\u6570\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>mysql \u63d0\u4f9b\u4ee5\u4e0b\u622a\u53d6\u5b57\u7b26\u4e32\u51fd\u6570\uff1a1. substring(str, start, length)\uff1b2. left(str, length)\uff1b3. right(str, length)\u3002\u793a\u4f8b\uff1a\u622a\u53d6 &#8220;hello world&#8221; \u7684\u524d 5 \u4e2a\u5b57\u7b26\uff1asubstring(&#8220;hello world&#8221;, 1, 5)\uff1b\u622a\u53d6 &#8220;hello world&#8221; \u7684\u524d 3 \u4e2a\u5b57\u7b26\uff1aleft(&#8220;hello world&#8221;, 3)\uff1b\u622a\u53d6 &#8220;hello world&#8221; \u7684\u540e 3 \u4e2a\u5b57\u7b26\uff1aright(&#8220;hello world&#8221;, MySQL \u622a\u53d6\u5b57\u7b26\u4e32\u7684\u51fd\u6570 MySQL \u63d0\u4f9b\u4e86\u4ee5\u4e0b\u51fd\u6570\u6765\u622a\u53d6\u5b57\u7b26\u4e32\uff1a SUBSTRING \u51fd\u6570 SUBSTRING(str, start, length) str\uff1a\u8981\u622a\u53d6\u7684\u5b57\u7b26\u4e32\u3002 start\uff1a\u8981\u5f00\u59cb\u622a\u53d6\u7684\u5b57\u7b26\u4f4d\u7f6e\uff08\u4ece 1 \u5f00\u59cb\uff09\u3002 length\uff1a\u8981\u622a\u53d6\u7684\u5b57\u7b26\u6570\u3002 LEFT \u51fd\u6570 LEFT(str, length) str\uff1a\u8981\u622a\u53d6\u7684\u5b57\u7b26\u4e32\u3002 length\uff1a\u8981\u622a\u53d6\u7684\u5b57\u7b26\u6570\uff08\u4ece\u5de6\u5f00\u59cb\uff09\u3002 RIGHT \u51fd\u6570 RIGHT(str, length) str\uff1a\u8981\u622a\u53d6\u7684\u5b57\u7b26\u4e32\u3002 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-6405","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6405","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=6405"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6405\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=6405"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=6405"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=6405"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}