{"id":5189,"date":"2024-11-14T09:17:05","date_gmt":"2024-11-14T01:17:05","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5189\/"},"modified":"2024-11-14T09:17:05","modified_gmt":"2024-11-14T01:17:05","slug":"sql%e4%b8%adinstr%e5%87%bd%e6%95%b0%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5189\/","title":{"rendered":"sql\u4e2dinstr\u51fd\u6570\u7528\u6cd5"},"content":{"rendered":"<blockquote><p>\n  instr() \u51fd\u6570\u7528\u4e8e\u5728\u5b57\u7b26\u4e32\u4e2d\u67e5\u627e\u5b50\u5b57\u7b26\u4e32\u7684\u7b2c\u4e00\u4e2a\u51fa\u73b0\u4f4d\u7f6e\u3002\u7528\u6cd5\uff1ainstr(string_to_search, substring_to_find)\u3002\u5982\u679c\u627e\u5230\u5b50\u5b57\u7b26\u4e32\uff0c\u8fd4\u56de\u8d77\u59cb\u4f4d\u7f6e\uff0c\u5426\u5219\u8fd4\u56de 0\u3002instr() \u51fd\u6570\u4e0d\u533a\u5206\u5927\u5c0f\u5199\uff0c\u4ece\u5b57\u7b26\u4e32\u7b2c\u4e00\u4e2a\u5b57\u7b26\u5f00\u59cb\u641c\u7d22\uff0c\u4ec5\u8fd4\u56de\u7b2c\u4e00\u4e2a\u51fa\u73b0\u7684\u4f4d\u7f6e\u3002\u5b83\u8fd8\u53ef\u7528\u4e8e\u67e5\u627e\u7279\u5b9a\u5b57\u7b26\u548c\u6700\u540e\u4e00\u4e2a\u51fa\u73b0\u4f4d\u7f6e\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202405\/24\/2024052419241816476.jpg\" class=\"aligncenter\" title=\"sql\u4e2dinstr\u51fd\u6570\u7528\u6cd5\u63d2\u56fe\" alt=\"sql\u4e2dinstr\u51fd\u6570\u7528\u6cd5\u63d2\u56fe\" \/><\/p>\n<h2>SQL \u4e2d INSTR() \u51fd\u6570\u7684\u4f7f\u7528<\/h2>\n<p><strong>\u4ec0\u4e48\u662f INSTR() \u51fd\u6570\uff1f<\/strong><\/p>\n<p>INSTR() \u51fd\u6570\u7528\u4e8e\u5728\u6307\u5b9a\u7684\u5b57\u7b26\u4e32\u4e2d\u67e5\u627e\u53e6\u4e00\u5b57\u7b26\u4e32\u7684\u7b2c\u4e00\u4e2a\u51fa\u73b0\u4f4d\u7f6e\u3002<\/p>\n<p><strong>\u7528\u6cd5\uff1a<\/strong><\/p>\n<p>INSTR(string_to_search, substring_to_find)<\/p>\n<p>\u5176\u4e2d\uff1a<\/p>\n<ul>\n<li>string_to_search \u662f\u8981\u641c\u7d22\u7684\u5b57\u7b26\u4e32\u3002<\/li>\n<li>substring_to_find \u662f\u8981\u67e5\u627e\u7684\u5b50\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n<p><strong>\u8fd4\u56de\u7ed3\u679c\uff1a<\/strong><\/p>\n<p>\u5982\u679c\u5b50\u5b57\u7b26\u4e32\u5728\u5b57\u7b26\u4e32\u4e2d\u627e\u5230\uff0c\u5219\u8fd4\u56de\u5176\u8d77\u59cb\u4f4d\u7f6e\u3002\u5982\u679c\u672a\u627e\u5230\uff0c\u5219\u8fd4\u56de 0\u3002<\/p>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<p>\u67e5\u627e\u5b57\u7b26\u4e32 &#8220;Hello&#8221; \u4e2d\u5b50\u5b57\u7b26\u4e32 &#8220;ell&#8221; \u7684\u7b2c\u4e00\u4e2a\u51fa\u73b0\u4f4d\u7f6e\uff1a<\/p>\n<pre>SELECT INSTR('Hello', 'ell');<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u7ed3\u679c\uff1a2<\/p>\n<p><strong>\u6ce8\u610f\uff1a<\/strong><\/p>\n<ul>\n<li>INSTR() \u51fd\u6570\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u3002<\/li>\n<li>INSTR() \u51fd\u6570\u4ece\u5b57\u7b26\u4e32\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\u5f00\u59cb\u641c\u7d22\u3002<\/li>\n<li>\u5982\u679c\u5b50\u5b57\u7b26\u4e32\u5728\u5b57\u7b26\u4e32\u4e2d\u51fa\u73b0\u591a\u6b21\uff0cINSTR() \u51fd\u6570\u53ea\u8fd4\u56de\u7b2c\u4e00\u4e2a\u51fa\u73b0\u7684\u4f4d\u7f6e\u3002<\/li>\n<\/ul>\n<p><strong>\u5176\u4ed6\u7528\u6cd5\uff1a<\/strong><\/p>\n<p>INSTR() \u51fd\u6570\u8fd8\u6709\u4ee5\u4e0b\u7528\u6cd5\uff1a<\/p>\n<ul>\n<li>\u67e5\u627e\u7279\u5b9a\u5b57\u7b26\uff1a\u4f7f\u7528\u5355\u5b57\u7b26\u4f5c\u4e3a\u5b50\u5b57\u7b26\u4e32\u53c2\u6570\u3002<\/li>\n<li>\u67e5\u627e\u6700\u540e\u4e00\u4e2a\u51fa\u73b0\u4f4d\u7f6e\uff1a\u4f7f\u7528 INSTR() \u51fd\u6570\u7684 -1 \u53c2\u6570\u3002<\/li>\n<\/ul>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<p>\u67e5\u627e\u5b57\u7b26\u4e32 &#8220;Hello&#8221; \u4e2d\u5b57\u7b26 &#8220;l&#8221; \u7684\u6700\u540e\u4e00\u4e2a\u51fa\u73b0\u4f4d\u7f6e\uff1a<\/p>\n<pre>SELECT INSTR('Hello', 'l', -1);<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u7ed3\u679c\uff1a3<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fsql\u4e2dinstr\u51fd\u6570\u7528\u6cd5\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>instr() \u51fd\u6570\u7528\u4e8e\u5728\u5b57\u7b26\u4e32\u4e2d\u67e5\u627e\u5b50\u5b57\u7b26\u4e32\u7684\u7b2c\u4e00\u4e2a\u51fa\u73b0\u4f4d\u7f6e\u3002\u7528\u6cd5\uff1ainstr(string_to_search, substring_to_find)\u3002\u5982\u679c\u627e\u5230\u5b50\u5b57\u7b26\u4e32\uff0c\u8fd4\u56de\u8d77\u59cb\u4f4d\u7f6e\uff0c\u5426\u5219\u8fd4\u56de 0\u3002instr() \u51fd\u6570\u4e0d\u533a\u5206\u5927\u5c0f\u5199\uff0c\u4ece\u5b57\u7b26\u4e32\u7b2c\u4e00\u4e2a\u5b57\u7b26\u5f00\u59cb\u641c\u7d22\uff0c\u4ec5\u8fd4\u56de\u7b2c\u4e00\u4e2a\u51fa\u73b0\u7684\u4f4d\u7f6e\u3002\u5b83\u8fd8\u53ef\u7528\u4e8e\u67e5\u627e\u7279\u5b9a\u5b57\u7b26\u548c\u6700\u540e\u4e00\u4e2a\u51fa\u73b0\u4f4d\u7f6e\u3002 SQL \u4e2d INSTR() \u51fd\u6570\u7684\u4f7f\u7528 \u4ec0\u4e48\u662f INSTR() \u51fd\u6570\uff1f INSTR() \u51fd\u6570\u7528\u4e8e\u5728\u6307\u5b9a\u7684\u5b57\u7b26\u4e32\u4e2d\u67e5\u627e\u53e6\u4e00\u5b57\u7b26\u4e32\u7684\u7b2c\u4e00\u4e2a\u51fa\u73b0\u4f4d\u7f6e\u3002 \u7528\u6cd5\uff1a INSTR(string_to_search, substring_to_find) \u5176\u4e2d\uff1a string_to_search \u662f\u8981\u641c\u7d22\u7684\u5b57\u7b26\u4e32\u3002 substring_to_find \u662f\u8981\u67e5\u627e\u7684\u5b50\u5b57\u7b26\u4e32\u3002 \u8fd4\u56de\u7ed3\u679c\uff1a \u5982\u679c\u5b50\u5b57\u7b26\u4e32\u5728\u5b57\u7b26\u4e32\u4e2d\u627e\u5230\uff0c\u5219\u8fd4\u56de\u5176\u8d77\u59cb\u4f4d\u7f6e\u3002\u5982\u679c\u672a\u627e\u5230\uff0c\u5219\u8fd4\u56de 0\u3002 \u793a\u4f8b\uff1a \u67e5\u627e\u5b57\u7b26\u4e32 &#8220;Hello&#8221; \u4e2d\u5b50\u5b57\u7b26\u4e32 &#8220;ell&#8221; \u7684\u7b2c\u4e00\u4e2a\u51fa\u73b0\u4f4d\u7f6e\uff1a SELECT INSTR(&#8216;Hello&#8217;, &#8216;ell&#8217;); \u767b\u5f55\u540e\u590d\u5236 \u7ed3\u679c\uff1a2 \u6ce8\u610f\uff1a INSTR() \u51fd\u6570\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u3002 INSTR() \u51fd\u6570\u4ece\u5b57\u7b26\u4e32\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\u5f00\u59cb\u641c\u7d22\u3002 \u5982\u679c\u5b50\u5b57\u7b26\u4e32\u5728\u5b57\u7b26\u4e32\u4e2d\u51fa\u73b0\u591a\u6b21\uff0cINSTR() \u51fd\u6570\u53ea\u8fd4\u56de\u7b2c\u4e00\u4e2a\u51fa\u73b0\u7684\u4f4d\u7f6e\u3002 \u5176\u4ed6\u7528\u6cd5\uff1a INSTR() \u51fd\u6570\u8fd8\u6709\u4ee5\u4e0b\u7528\u6cd5\uff1a \u67e5\u627e\u7279\u5b9a\u5b57\u7b26\uff1a\u4f7f\u7528\u5355\u5b57\u7b26\u4f5c\u4e3a\u5b50\u5b57\u7b26\u4e32\u53c2\u6570\u3002 \u67e5\u627e\u6700\u540e\u4e00\u4e2a\u51fa\u73b0\u4f4d\u7f6e\uff1a\u4f7f\u7528 INSTR() \u51fd\u6570\u7684 -1 \u53c2\u6570\u3002 \u793a\u4f8b\uff1a \u67e5\u627e\u5b57\u7b26\u4e32 &#8220;Hello&#8221; [&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-5189","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5189","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=5189"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5189\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5189"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5189"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5189"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}