{"id":5139,"date":"2024-11-14T10:22:56","date_gmt":"2024-11-14T02:22:56","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5139\/"},"modified":"2024-11-14T10:22:56","modified_gmt":"2024-11-14T02:22:56","slug":"mysql%e6%80%8e%e4%b9%88%e8%bf%94%e5%9b%9e%e4%b8%80%e8%a1%8c","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5139\/","title":{"rendered":"mysql\u600e\u4e48\u8fd4\u56de\u4e00\u884c"},"content":{"rendered":"<blockquote><p>\n  \u4ece mysql \u4e2d\u8fd4\u56de\u4e00\u884c\u6570\u636e\u7684\u65b9\u6cd5\u5305\u62ec\uff1alimit \u5b50\u53e5\uff1a\u9650\u5236\u8fd4\u56de\u884c\u6570\u4e3a 1\u3002limit offset \u5b50\u53e5\uff1a\u8df3\u8fc7 0 \u884c\u5e76\u8fd4\u56de\u7b2c\u4e00\u884c\u3002top \u5b50\u53e5\uff08sql server\uff09\uff1a\u8fd4\u56de\u524d 1 \u884c\u3002first \u5b50\u53e5\uff08oracle\uff09\uff1a\u8fd4\u56de\u524d 1 \u884c\u3002rownum \u4f2a\u5217\uff08oracle\uff09\uff1a\u8fd4\u56de\u884c\u7684\u987a\u5e8f\u53f7\u4e3a 1\u3002\u5b50\u67e5\u8be2\uff1a\u4ece\u53e6\u4e00\u4e2a\u67e5\u8be2\u4e2d\u9009\u62e9\u4e00\u884c\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202405\/22\/2024052216092569004.jpg\" class=\"aligncenter\" title=\"mysql\u600e\u4e48\u8fd4\u56de\u4e00\u884c\u63d2\u56fe\" alt=\"mysql\u600e\u4e48\u8fd4\u56de\u4e00\u884c\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u4ece MySQL \u8fd4\u56de\u4e00\u884c<\/strong><\/p>\n<p>\u4ece MySQL \u8868\u4e2d\u8fd4\u56de\u4e00\u884c\u7684\u65b9\u6cd5\u6709\u4ee5\u4e0b\u51e0\u79cd\uff1a<\/p>\n<p><strong>1. LIMIT \u5b50\u53e5<\/strong><\/p>\n<pre>SELECT * FROM table_name LIMIT 1;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>LIMIT \u5b50\u53e5\u7528\u4e8e\u9650\u5236\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u884c\u6570\u3002\u5c06\u5176\u8bbe\u7f6e\u4e3a 1 \u53ef\u53ea\u8fd4\u56de\u4e00\u884c\u3002<\/p>\n<p><strong>2. LIMIT OFFSET \u5b50\u53e5<\/strong><\/p>\n<pre>SELECT * FROM table_name LIMIT 1 OFFSET 0;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>OFFSET \u5b50\u53e5\u7528\u4e8e\u8df3\u8fc7\u6307\u5b9a\u6570\u91cf\u7684\u884c\u3002\u5c06\u5176\u8bbe\u7f6e\u4e3a 0 \u5c06\u8fd4\u56de\u8868\u4e2d\u7684\u7b2c\u4e00\u884c\u3002<\/p>\n<p><strong>3. TOP \u5b50\u53e5\uff08\u4ec5\u9002\u7528\u4e8e Microsoft SQL Server\uff09<\/strong><\/p>\n<pre>SELECT TOP 1 * FROM table_name;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>TOP \u5b50\u53e5\u7528\u4e8e\u8fd4\u56de\u6307\u5b9a\u6570\u91cf\u7684\u884c\u3002\u5c06\u5176\u8bbe\u7f6e\u4e3a 1 \u53ef\u53ea\u8fd4\u56de\u4e00\u884c\u3002<\/p>\n<p><strong>4. FIRST \u5b50\u53e5\uff08\u4ec5\u9002\u7528\u4e8e Oracle\uff09<\/strong><\/p>\n<pre>SELECT * FROM table_name FETCH FIRST 1 ROWS ONLY;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>FIRST \u5b50\u53e5\u7528\u4e8e\u8fd4\u56de\u6307\u5b9a\u6570\u91cf\u7684\u884c\u3002\u5c06\u5176\u8bbe\u7f6e\u4e3a 1 \u53ef\u53ea\u8fd4\u56de\u4e00\u884c\u3002<\/p>\n<p><strong>5. ROWNUM \u4f2a\u5217\uff08\u4ec5\u9002\u7528\u4e8e Oracle\uff09<\/strong><\/p>\n<pre>SELECT * FROM table_name WHERE ROWNUM = 1;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>ROWNUM \u4f2a\u5217\u8fd4\u56de\u884c\u7684\u987a\u5e8f\u53f7\u3002\u5c06\u5176\u4e0e WHERE \u5b50\u53e5\u4e00\u8d77\u4f7f\u7528\uff0c\u53ef\u8fd4\u56de\u7279\u5b9a\u884c\u7684\u503c\u3002<\/p>\n<p><strong>6. \u4f7f\u7528\u5b50\u67e5\u8be2<\/strong><\/p>\n<pre>SELECT * FROM table_name WHERE id IN (SELECT id FROM table_name LIMIT 1);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5b50\u67e5\u8be2\u53ef\u7528\u4e8e\u4ece\u53e6\u4e00\u4e2a\u67e5\u8be2\u4e2d\u9009\u62e9\u4e00\u884c\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u600e\u4e48\u8fd4\u56de\u4e00\u884c\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>\u4ece mysql \u4e2d\u8fd4\u56de\u4e00\u884c\u6570\u636e\u7684\u65b9\u6cd5\u5305\u62ec\uff1alimit \u5b50\u53e5\uff1a\u9650\u5236\u8fd4\u56de\u884c\u6570\u4e3a 1\u3002limit offset \u5b50\u53e5\uff1a\u8df3\u8fc7 0 \u884c\u5e76\u8fd4\u56de\u7b2c\u4e00\u884c\u3002top \u5b50\u53e5\uff08sql server\uff09\uff1a\u8fd4\u56de\u524d 1 \u884c\u3002first \u5b50\u53e5\uff08oracle\uff09\uff1a\u8fd4\u56de\u524d 1 \u884c\u3002rownum \u4f2a\u5217\uff08oracle\uff09\uff1a\u8fd4\u56de\u884c\u7684\u987a\u5e8f\u53f7\u4e3a 1\u3002\u5b50\u67e5\u8be2\uff1a\u4ece\u53e6\u4e00\u4e2a\u67e5\u8be2\u4e2d\u9009\u62e9\u4e00\u884c\u3002 \u5982\u4f55\u4ece MySQL \u8fd4\u56de\u4e00\u884c \u4ece MySQL \u8868\u4e2d\u8fd4\u56de\u4e00\u884c\u7684\u65b9\u6cd5\u6709\u4ee5\u4e0b\u51e0\u79cd\uff1a 1. LIMIT \u5b50\u53e5 SELECT * FROM table_name LIMIT 1; \u767b\u5f55\u540e\u590d\u5236 LIMIT \u5b50\u53e5\u7528\u4e8e\u9650\u5236\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u884c\u6570\u3002\u5c06\u5176\u8bbe\u7f6e\u4e3a 1 \u53ef\u53ea\u8fd4\u56de\u4e00\u884c\u3002 2. LIMIT OFFSET \u5b50\u53e5 SELECT * FROM table_name LIMIT 1 OFFSET 0; \u767b\u5f55\u540e\u590d\u5236 OFFSET \u5b50\u53e5\u7528\u4e8e\u8df3\u8fc7\u6307\u5b9a\u6570\u91cf\u7684\u884c\u3002\u5c06\u5176\u8bbe\u7f6e\u4e3a 0 \u5c06\u8fd4\u56de\u8868\u4e2d\u7684\u7b2c\u4e00\u884c\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-5139","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5139","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=5139"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5139\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5139"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5139"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5139"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}