{"id":142491,"date":"2024-10-31T22:44:20","date_gmt":"2024-10-31T14:44:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/142491\/"},"modified":"2024-10-31T22:44:20","modified_gmt":"2024-10-31T14:44:20","slug":"sqlite-%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5%ef%bc%9a%e5%af%a6%e7%8f%be%e9%ab%98%e6%95%88%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%ef%bc%88sqlite-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/142491\/","title":{"rendered":"SQLite \u67e5\u8a62\u8a9e\u53e5\uff1a\u5be6\u73fe\u9ad8\u6548\u6578\u64da\u5eab\u67e5\u8a62\uff08sqlite \u6578\u64da\u5eab\u67e5\u8a62\u8a9e\u53e5\uff09"},"content":{"rendered":"<h1 id=\"sqlite-%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5%ef%bc%9a%e5%af%a6%e7%8f%be%e9%ab%98%e6%95%88%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2-JLArVBmQFi\">SQLite \u67e5\u8a62\u8a9e\u53e5\uff1a\u5be6\u73fe\u9ad8\u6548\u6578\u64da\u5eab\u67e5\u8a62<\/h1>\n<p>SQLite \u662f\u4e00\u7a2e\u8f15\u91cf\u7d1a\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u61c9\u7528\u7a0b\u5e8f\u4e2d\uff0c\u7279\u5225\u662f\u5728\u79fb\u52d5\u8a2d\u5099\u548c\u5d4c\u5165\u5f0f\u7cfb\u7d71\u4e2d\u3002\u5176\u7c21\u55ae\u6613\u7528\u7684\u7279\u6027\u4f7f\u5f97\u958b\u767c\u8005\u80fd\u5920\u5feb\u901f\u4e0a\u624b\uff0c\u800c\u67e5\u8a62\u8a9e\u53e5\u5247\u662f\u64cd\u4f5c SQLite \u6578\u64da\u5eab\u7684\u6838\u5fc3\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e SQLite \u7684\u67e5\u8a62\u8a9e\u53e5\uff0c\u5e6b\u52a9\u8b80\u8005\u5be6\u73fe\u9ad8\u6548\u7684\u6578\u64da\u5eab\u67e5\u8a62\u3002<\/p>\n<h2 id=\"sqlite-%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e7%b5%90%e6%a7%8b-JLArVBmQFi\">SQLite \u67e5\u8a62\u8a9e\u53e5\u7684\u57fa\u672c\u7d50\u69cb<\/h2>\n<p>SQLite \u7684\u67e5\u8a62\u8a9e\u53e5\u4e3b\u8981\u7531 <code>SELECT<\/code> \u8a9e\u53e5\u7d44\u6210\uff0c\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT column1, column2, ...\nFROM table_name\nWHERE condition;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>column1, column2, ...<\/code> \u662f\u8981\u67e5\u8a62\u7684\u5217\uff0c<code>table_name<\/code> \u662f\u6578\u64da\u8868\u7684\u540d\u7a31\uff0c\u800c <code>condition<\/code> \u5247\u662f\u904e\u6ffe\u689d\u4ef6\u3002\u9019\u7a2e\u7d50\u69cb\u4f7f\u5f97\u7528\u6236\u80fd\u5920\u9748\u6d3b\u5730\u9078\u64c7\u6240\u9700\u7684\u6578\u64da\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-where-%e5%ad%90%e5%8f%a5%e9%80%b2%e8%a1%8c%e9%81%8e%e6%bf%be-JLArVBmQFi\">\u4f7f\u7528 WHERE \u5b50\u53e5\u9032\u884c\u904e\u6ffe<\/h2>\n<p>\u5728\u67e5\u8a62\u4e2d\uff0c<code>WHERE<\/code> \u5b50\u53e5\u7528\u65bc\u6307\u5b9a\u67e5\u8a62\u7684\u689d\u4ef6\u3002\u9019\u6a23\u53ef\u4ee5\u6709\u6548\u5730\u904e\u6ffe\u51fa\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>employees<\/code> \u7684\u8868\uff0c\u5305\u542b\u54e1\u5de5\u7684\u59d3\u540d\u548c\u5e74\u9f61\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u8fd4\u56de\u5e74\u9f61\u5927\u65bc 30 \u7684\u54e1\u5de5\uff1a<\/p>\n<pre><code>SELECT name, age\nFROM employees\nWHERE age &gt; 30;<\/code><\/pre>\n<h2 id=\"%e6%8e%92%e5%ba%8f%e5%92%8c%e9%99%90%e5%88%b6%e6%9f%a5%e8%a9%a2%e7%b5%90%e6%9e%9c-JLArVBmQFi\">\u6392\u5e8f\u548c\u9650\u5236\u67e5\u8a62\u7d50\u679c<\/h2>\n<p>SQLite \u5141\u8a31\u4f7f\u7528 <code>ORDER BY<\/code> \u5b50\u53e5\u5c0d\u67e5\u8a62\u7d50\u679c\u9032\u884c\u6392\u5e8f\uff0c\u4e26\u4e14\u53ef\u4ee5\u4f7f\u7528 <code>LIMIT<\/code> \u5b50\u53e5\u9650\u5236\u8fd4\u56de\u7684\u884c\u6578\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u8fd4\u56de\u5e74\u9f61\u6700\u5927\u7684\u524d\u4e94\u540d\u54e1\u5de5\uff1a<\/p>\n<pre><code>SELECT name, age\nFROM employees\nORDER BY age DESC\nLIMIT 5;<\/code><\/pre>\n<h2 id=\"%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8%e7%9a%84%e4%bd%bf%e7%94%a8-JLArVBmQFi\">\u805a\u5408\u51fd\u6578\u7684\u4f7f\u7528<\/h2>\n<p>SQLite \u63d0\u4f9b\u4e86\u591a\u7a2e\u805a\u5408\u51fd\u6578\uff0c\u5982 <code>COUNT()<\/code>\u3001<code>SUM()<\/code>\u3001<code>AVG()<\/code> \u7b49\uff0c\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u7528\u65bc\u8a08\u7b97\u6578\u64da\u7684\u7d71\u8a08\u4fe1\u606f\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u8a08\u7b97\u54e1\u5de5\u7684\u7e3d\u6578\uff1a<\/p>\n<pre><code>SELECT COUNT(*)\nFROM employees;<\/code><\/pre>\n<h2 id=\"%e8%81%af%e6%8e%a5%e6%9f%a5%e8%a9%a2-JLArVBmQFi\">\u806f\u63a5\u67e5\u8a62<\/h2>\n<p>\u5728\u591a\u500b\u8868\u4e4b\u9593\u9032\u884c\u67e5\u8a62\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u806f\u63a5\uff08JOIN\uff09\u4f86\u7372\u53d6\u76f8\u95dc\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u806f\u63a5\u67e5\u8a62\u793a\u4f8b\uff0c\u5047\u8a2d\u6211\u5011\u6709\u5169\u500b\u8868\uff1a<code>employees<\/code> \u548c <code>departments<\/code>\uff0c\u6211\u5011\u5e0c\u671b\u67e5\u8a62\u6bcf\u4f4d\u54e1\u5de5\u53ca\u5176\u6240\u5c6c\u90e8\u9580\u7684\u540d\u7a31\uff1a<\/p>\n<pre><code>SELECT employees.name, departments.department_name\nFROM employees\nJOIN departments ON employees.department_id = departments.id;<\/code><\/pre>\n<h2 id=\"%e5%b0%8f%e7%b5%90-JLArVBmQFi\">\u5c0f\u7d50<\/h2>\n<p>SQLite \u7684\u67e5\u8a62\u8a9e\u53e5\u529f\u80fd\u5f37\u5927\u4e14\u9748\u6d3b\uff0c\u80fd\u5920\u6eff\u8db3\u5404\u7a2e\u6578\u64da\u67e5\u8a62\u9700\u6c42\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528 <code>SELECT<\/code>\u3001<code>WHERE<\/code>\u3001<code>ORDER BY<\/code>\u3001\u805a\u5408\u51fd\u6578\u53ca\u806f\u63a5\u67e5\u8a62\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u9ad8\u6548\u5730\u5f9e\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u7684\u67e5\u8a62\u8a9e\u53e5\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u6578\u64da\u8655\u7406\u7684\u6548\u7387\uff0c\u4e26\u70ba\u61c9\u7528\u7a0b\u5e8f\u7684\u958b\u767c\u63d0\u4f9b\u5f37\u6709\u529b\u7684\u652f\u6301\u3002<\/p>\n<p>\u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3\u5982\u4f55\u5728\u9ad8\u6548\u7684\u74b0\u5883\u4e2d\u904b\u884c SQLite \u6578\u64da\u5eab\uff0c\u60a8\u53ef\u4ee5\u8003\u616e\u4f7f\u7528 <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u670d\u52d9\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u61c9\u7528\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22SQLite\u67e5\u8a62\u8a9e\u53e5\uff0c\u5b78\u7fd2\u5982\u4f55\u9ad8\u6548\u57f7\u884c\u6578\u64da\u5eab\u67e5\u8a62\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u7c21\u5316\u6578\u64da\u7ba1\u7406\u6d41\u7a0b\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-142491","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/142491","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=142491"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/142491\/revisions"}],"predecessor-version":[{"id":142492,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/142491\/revisions\/142492"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=142491"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=142491"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=142491"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}