{"id":175307,"date":"2024-11-08T04:46:18","date_gmt":"2024-11-07T20:46:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/175307\/"},"modified":"2024-11-08T04:46:18","modified_gmt":"2024-11-07T20:46:18","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8pos%e5%91%bd%e4%bb%a4%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9f-%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e5%ba%abpos%e5%91%bd%e4%bb%a4","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/175307\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528POS\u547d\u4ee4\u67e5\u8a62\u6578\u64da\u5eab\uff1f (\u67e5\u8a62\u6578\u64da\u5eabpos\u547d\u4ee4)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8pos%e5%91%bd%e4%bb%a4%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9f-%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e5%ba%abpos%e5%91%bd%e4%bb%a4-FZLbXRAHCw\">\u5982\u4f55\u4f7f\u7528POS\u547d\u4ee4\u67e5\u8a62\u6578\u64da\u5eab\uff1f (\u67e5\u8a62\u6578\u64da\u5eabpos\u547d\u4ee4)<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cPOS\u547d\u4ee4\u662f\u4e00\u7a2e\u5e38\u7528\u7684\u67e5\u8a62\u5de5\u5177\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u6642\u3002POS\u547d\u4ee4\u7684\u5168\u540d\u662f\u201cPostgreSQL\u547d\u4ee4\u201d\uff0c\u5b83\u662f\u7528\u65bc\u67e5\u8a62\u548c\u7ba1\u7406PostgreSQL\u6578\u64da\u5eab\u7684\u4e00\u7a2e\u547d\u4ee4\u884c\u5de5\u5177\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528POS\u547d\u4ee4\u67e5\u8a62\u6578\u64da\u5eab\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u6280\u5de7\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afpos%e5%91%bd%e4%bb%a4%ef%bc%9f-FZLbXRAHCw\">\u4ec0\u9ebc\u662fPOS\u547d\u4ee4\uff1f<\/h2>\n<p>POS\u547d\u4ee4\u662fPostgreSQL\u6578\u64da\u5eab\u7cfb\u7d71\u7684\u4e00\u90e8\u5206\uff0c\u5141\u8a31\u7528\u6236\u901a\u904e\u547d\u4ee4\u884c\u754c\u9762\u8207\u6578\u64da\u5eab\u9032\u884c\u4ea4\u4e92\u3002\u9019\u4e9b\u547d\u4ee4\u53ef\u4ee5\u7528\u4f86\u57f7\u884c\u5404\u7a2e\u64cd\u4f5c\uff0c\u5305\u62ec\u67e5\u8a62\u6578\u64da\u3001\u66f4\u65b0\u8a18\u9304\u3001\u522a\u9664\u6578\u64da\u7b49\u3002\u4f7f\u7528POS\u547d\u4ee4\u7684\u512a\u52e2\u5728\u65bc\u5b83\u7684\u9748\u6d3b\u6027\u548c\u9ad8\u6548\u6027\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e9%80%a3%e6%8e%a5%e5%88%b0postgresql%e6%95%b8%e6%93%9a%e5%ba%ab-FZLbXRAHCw\">\u5982\u4f55\u9023\u63a5\u5230PostgreSQL\u6578\u64da\u5eab<\/h2>\n<p>\u5728\u4f7f\u7528POS\u547d\u4ee4\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u9023\u63a5\u5230PostgreSQL\u6578\u64da\u5eab\u3002\u9019\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0b\u547d\u4ee4\u5b8c\u6210\uff1a<\/p>\n<pre><code>psql -h \u4e3b\u6a5f\u540d -U \u7528\u6236\u540d -d \u6578\u64da\u5eab\u540d<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>\u4e3b\u6a5f\u540d<\/code>\u662f\u6578\u64da\u5eab\u4f3a\u670d\u5668\u7684\u5730\u5740\uff0c<code>\u7528\u6236\u540d<\/code>\u662f\u7528\u65bc\u767b\u9304\u7684\u7528\u6236\u540d\uff0c<code>\u6578\u64da\u5eab\u540d<\/code>\u662f\u8981\u67e5\u8a62\u7684\u6578\u64da\u5eab\u7684\u540d\u7a31\u3002\u9023\u63a5\u6210\u529f\u5f8c\uff0c\u60a8\u5c07\u9032\u5165PostgreSQL\u7684\u547d\u4ee4\u884c\u754c\u9762\u3002<\/p>\n<h2 id=\"%e5%9f%ba%e6%9c%ac%e6%9f%a5%e8%a9%a2%e5%91%bd%e4%bb%a4-FZLbXRAHCw\">\u57fa\u672c\u67e5\u8a62\u547d\u4ee4<\/h2>\n<p>\u4e00\u65e6\u9023\u63a5\u5230\u6578\u64da\u5eab\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528SQL\u8a9e\u53e5\u9032\u884c\u67e5\u8a62\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u57fa\u672c\u7684\u67e5\u8a62\u547d\u4ee4\uff1a<\/p>\n<h3 id=\"1-%e6%9f%a5%e8%a9%a2%e6%89%80%e6%9c%89%e8%a8%98%e9%8c%84-FZLbXRAHCw\">1. \u67e5\u8a62\u6240\u6709\u8a18\u9304<\/h3>\n<p>\u8981\u67e5\u8a62\u67d0\u500b\u8868\u4e2d\u7684\u6240\u6709\u8a18\u9304\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre><code>SELECT * FROM \u8868\u540d;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u6307\u5b9a\u8868\u4e2d\u7684\u6240\u6709\u884c\u548c\u5217\u3002<\/p>\n<h3 id=\"2-%e6%9f%a5%e8%a9%a2%e7%89%b9%e5%ae%9a%e5%88%97-FZLbXRAHCw\">2. \u67e5\u8a62\u7279\u5b9a\u5217<\/h3>\n<p>\u5982\u679c\u53ea\u60f3\u67e5\u8a62\u7279\u5b9a\u7684\u5217\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT \u5217\u540d1, \u5217\u540d2 FROM \u8868\u540d;<\/code><\/pre>\n<p>\u9019\u5c07\u50c5\u8fd4\u56de\u6307\u5b9a\u7684\u5217\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e6%a2%9d%e4%bb%b6%e6%9f%a5%e8%a9%a2-FZLbXRAHCw\">3. \u4f7f\u7528\u689d\u4ef6\u67e5\u8a62<\/h3>\n<p>\u60a8\u53ef\u4ee5\u4f7f\u7528<code>WHERE<\/code>\u5b50\u53e5\u4f86\u904e\u6ffe\u7d50\u679c\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM \u8868\u540d WHERE \u689d\u4ef6;<\/code><\/pre>\n<p>\u9019\u5c07\u50c5\u8fd4\u56de\u7b26\u5408\u689d\u4ef6\u7684\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e9%80%b2%e9%9a%8e%e6%9f%a5%e8%a9%a2%e6%8a%80%e5%b7%a7-FZLbXRAHCw\">\u9032\u968e\u67e5\u8a62\u6280\u5de7<\/h2>\n<p>\u9664\u4e86\u57fa\u672c\u67e5\u8a62\u5916\uff0cPOS\u547d\u4ee4\u9084\u652f\u6301\u4e00\u4e9b\u9032\u968e\u67e5\u8a62\u6280\u5de7\uff1a<\/p>\n<h3 id=\"1-%e6%8e%92%e5%ba%8f%e7%b5%90%e6%9e%9c-FZLbXRAHCw\">1. \u6392\u5e8f\u7d50\u679c<\/h3>\n<p>\u4f7f\u7528<code>ORDER BY<\/code>\u5b50\u53e5\u53ef\u4ee5\u5c0d\u67e5\u8a62\u7d50\u679c\u9032\u884c\u6392\u5e8f\uff1a<\/p>\n<pre><code>SELECT * FROM \u8868\u540d ORDER BY \u5217\u540d ASC|DESC;<\/code><\/pre>\n<p>\u9019\u5c07\u6839\u64da\u6307\u5b9a\u7684\u5217\u9032\u884c\u5347\u5e8f\u6216\u964d\u5e8f\u6392\u5e8f\u3002<\/p>\n<h3 id=\"2-%e5%88%86%e7%b5%84%e6%9f%a5%e8%a9%a2-FZLbXRAHCw\">2. \u5206\u7d44\u67e5\u8a62<\/h3>\n<p>\u4f7f\u7528<code>GROUP BY<\/code>\u5b50\u53e5\u53ef\u4ee5\u5c0d\u7d50\u679c\u9032\u884c\u5206\u7d44\uff1a<\/p>\n<pre><code>SELECT \u5217\u540d, COUNT(*) FROM \u8868\u540d GROUP BY \u5217\u540d;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u6bcf\u500b\u5206\u7d44\u7684\u8a08\u6578\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e8%81%af%e6%8e%a5%e6%9f%a5%e8%a9%a2-FZLbXRAHCw\">3. \u4f7f\u7528\u806f\u63a5\u67e5\u8a62<\/h3>\n<p>\u5982\u679c\u9700\u8981\u5f9e\u591a\u500b\u8868\u4e2d\u67e5\u8a62\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528\u806f\u63a5\uff1a<\/p>\n<pre><code>SELECT * FROM \u88681 JOIN \u88682 ON \u88681.\u5217\u540d = \u88682.\u5217\u540d;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u7b26\u5408\u806f\u63a5\u689d\u4ef6\u7684\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-FZLbXRAHCw\">\u7e3d\u7d50<\/h2>\n<p>\u4f7f\u7528POS\u547d\u4ee4\u67e5\u8a62\u6578\u64da\u5eab\u662f\u4e00\u7a2e\u9ad8\u6548\u4e14\u9748\u6d3b\u7684\u65b9\u6cd5\uff0c\u9069\u5408\u5404\u7a2e\u6578\u64da\u7ba1\u7406\u9700\u6c42\u3002\u901a\u904e\u638c\u63e1\u57fa\u672c\u548c\u9032\u968e\u7684\u67e5\u8a62\u6280\u5de7\uff0c\u60a8\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u5f9ePostgreSQL\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u7121\u8ad6\u60a8\u662f\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u9084\u662f\u958b\u767c\u4eba\u54e1\uff0c\u719f\u6089\u9019\u4e9b\u547d\u4ee4\u90fd\u5c07\u5c0d\u60a8\u7684\u5de5\u4f5c\u5927\u6709\u88e8\u76ca\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u6258\u7ba1\u60a8\u7684\u6578\u64da\u5eab\u3002Server.HK\u63d0\u4f9b\u7a69\u5b9a\u7684\u670d\u52d9\u548c\u9748\u6d3b\u7684\u914d\u7f6e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u6578\u64da\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u4f7f\u7528POS\u547d\u4ee4\u67e5\u8a62\u6578\u64da\u5eab\uff0c\u638c\u63e1\u57fa\u672c\u8a9e\u6cd5\u548c\u6280\u5de7\uff0c\u8f15\u9b06\u7372\u53d6\u6240\u9700\u6578\u64da\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-175307","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175307","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=175307"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175307\/revisions"}],"predecessor-version":[{"id":175308,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175307\/revisions\/175308"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=175307"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=175307"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=175307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}