{"id":168541,"date":"2024-11-06T13:14:17","date_gmt":"2024-11-06T05:14:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168541\/"},"modified":"2024-11-06T13:14:18","modified_gmt":"2024-11-06T05:14:18","slug":"sql-%e4%b8%ad%e6%b1%82%e5%92%8c%e5%87%bd%e6%95%b8-sum-%e7%9a%84%e6%87%89%e7%94%a8%e5%af%a6%e4%be%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168541\/","title":{"rendered":"SQL \u4e2d\u6c42\u548c\u51fd\u6578 SUM() \u7684\u61c9\u7528\u5be6\u4f8b"},"content":{"rendered":"<h1 id=\"sql-%e4%b8%ad%e6%b1%82%e5%92%8c%e5%87%bd%e6%95%b8-sum-%e7%9a%84%e6%87%89%e7%94%a8%e5%af%a6%e4%be%8b-gupSFtyopb\">SQL \u4e2d\u6c42\u548c\u51fd\u6578 SUM() \u7684\u61c9\u7528\u5be6\u4f8b<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u4e00\u7a2e\u7528\u65bc\u67e5\u8a62\u548c\u64cd\u4f5c\u8cc7\u6599\u7684\u6a19\u6e96\u8a9e\u8a00\u3002\u6c42\u548c\u51fd\u6578 <code>SUM()<\/code> \u662f SQL \u4e2d\u4e00\u500b\u975e\u5e38\u91cd\u8981\u7684\u805a\u5408\u51fd\u6578\uff0c\u4e3b\u8981\u7528\u65bc\u8a08\u7b97\u6578\u503c\u578b\u6b04\u4f4d\u7684\u7e3d\u548c\u3002\u672c\u6587\u5c07\u63a2\u8a0e <code>SUM()<\/code> \u51fd\u6578\u7684\u57fa\u672c\u7528\u6cd5\u53ca\u5176\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u5e7e\u500b\u4f8b\u5b50\u3002<\/p>\n<h2 id=\"sum-%e5%87%bd%e6%95%b8%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-gupSFtyopb\">SUM() \u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p><code>SUM()<\/code> \u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT SUM(column_name) \nFROM table_name \nWHERE condition;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>column_name<\/code> \u662f\u9700\u8981\u8a08\u7b97\u7e3d\u548c\u7684\u6b04\u4f4d\uff0c<code>table_name<\/code> \u662f\u8cc7\u6599\u8868\u7684\u540d\u7a31\uff0c\u800c <code>condition<\/code> \u5247\u662f\u53ef\u9078\u7684\u689d\u4ef6\uff0c\u7528\u65bc\u904e\u6ffe\u8cc7\u6599\u3002<\/p>\n<h2 id=\"sum-%e5%87%bd%e6%95%b8%e7%9a%84%e6%87%89%e7%94%a8%e5%af%a6%e4%be%8b-gupSFtyopb\">SUM() \u51fd\u6578\u7684\u61c9\u7528\u5be6\u4f8b<\/h2>\n<h3 id=\"1-%e8%a8%88%e7%ae%97%e9%8a%b7%e5%94%ae%e7%b8%bd%e9%a1%8d-gupSFtyopb\">1. \u8a08\u7b97\u92b7\u552e\u7e3d\u984d<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>sales<\/code> \u7684\u8cc7\u6599\u8868\uff0c\u8a72\u8868\u5305\u542b\u4e86\u6bcf\u7b46\u92b7\u552e\u7684\u91d1\u984d\u3002\u82e5\u8981\u8a08\u7b97\u6240\u6709\u92b7\u552e\u7684\u7e3d\u984d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT SUM(amount) AS total_sales \nFROM sales;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de <code>amount<\/code> \u6b04\u4f4d\u7684\u7e3d\u548c\uff0c\u4e26\u5c07\u7d50\u679c\u547d\u540d\u70ba <code>total_sales<\/code>\u3002<\/p>\n<h3 id=\"2-%e8%a8%88%e7%ae%97%e7%89%b9%e5%ae%9a%e6%a2%9d%e4%bb%b6%e4%b8%8b%e7%9a%84%e7%b8%bd%e5%92%8c-gupSFtyopb\">2. \u8a08\u7b97\u7279\u5b9a\u689d\u4ef6\u4e0b\u7684\u7e3d\u548c<\/h3>\n<p>\u5982\u679c\u6211\u5011\u53ea\u60f3\u8a08\u7b97\u67d0\u4e00\u7279\u5b9a\u7522\u54c1\u7684\u92b7\u552e\u7e3d\u984d\uff0c\u4f8b\u5982\u7522\u54c1 ID \u70ba 101 \u7684\u92b7\u552e\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT SUM(amount) AS total_sales \nFROM sales \nWHERE product_id = 101;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u50c5\u8a08\u7b97\u7522\u54c1 ID \u70ba 101 \u7684\u92b7\u552e\u91d1\u984d\u3002<\/p>\n<h3 id=\"3-%e8%88%87-group-by-%e4%b8%80%e8%b5%b7%e4%bd%bf%e7%94%a8-gupSFtyopb\">3. \u8207 GROUP BY \u4e00\u8d77\u4f7f\u7528<\/h3>\n<p>\u5728\u8a31\u591a\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u9700\u8981\u6309\u67d0\u500b\u6b04\u4f4d\u5206\u7d44\u8a08\u7b97\u7e3d\u548c\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u8a08\u7b97\u6bcf\u500b\u7522\u54c1\u7684\u92b7\u552e\u7e3d\u984d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>GROUP BY<\/code> \u5b50\u53e5\uff1a<\/p>\n<pre><code>SELECT product_id, SUM(amount) AS total_sales \nFROM sales \nGROUP BY product_id;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u500b\u7522\u54c1\u7684 ID \u53ca\u5176\u5c0d\u61c9\u7684\u92b7\u552e\u7e3d\u984d\u3002<\/p>\n<h3 id=\"4-%e7%b5%90%e5%90%88%e5%85%b6%e4%bb%96%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8-gupSFtyopb\">4. \u7d50\u5408\u5176\u4ed6\u805a\u5408\u51fd\u6578<\/h3>\n<p>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u6211\u5011\u7d93\u5e38\u9700\u8981\u7d50\u5408\u5176\u4ed6\u805a\u5408\u51fd\u6578\u4f86\u7372\u53d6\u66f4\u5168\u9762\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u8a08\u7b97\u6bcf\u500b\u7522\u54c1\u7684\u92b7\u552e\u7e3d\u984d\u53ca\u5e73\u5747\u92b7\u552e\u91d1\u984d\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT product_id, \n       SUM(amount) AS total_sales, \n       AVG(amount) AS average_sales \nFROM sales \nGROUP BY product_id;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u500b\u7522\u54c1\u7684 ID\u3001\u92b7\u552e\u7e3d\u984d\u548c\u5e73\u5747\u92b7\u552e\u91d1\u984d\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-gupSFtyopb\">\u7e3d\u7d50<\/h2>\n<p>SQL \u4e2d\u7684 <code>SUM()<\/code> \u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u8a08\u7b97\u6578\u503c\u578b\u6b04\u4f4d\u7684\u7e3d\u548c\u3002\u7121\u8ad6\u662f\u5728\u7c21\u55ae\u7684\u67e5\u8a62\u4e2d\uff0c\u9084\u662f\u8207\u5176\u4ed6\u805a\u5408\u51fd\u6578\u7d50\u5408\u4f7f\u7528\uff0c<code>SUM()<\/code> \u51fd\u6578\u90fd\u80fd\u63d0\u4f9b\u6709\u50f9\u503c\u7684\u6578\u64da\u5206\u6790\u7d50\u679c\u3002\u5c0d\u65bc\u9700\u8981\u9032\u884c\u6578\u64da\u5206\u6790\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u7684 SQL \u67e5\u8a62\u6280\u5de7\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u61c9\u7528\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 SQL \u4e2d SUM() \u51fd\u6578\u7684\u61c9\u7528\u5be6\u4f8b\uff0c\u4e86\u89e3\u5982\u4f55\u9ad8\u6548\u8a08\u7b97\u6578\u64da\u7e3d\u548c\uff0c\u63d0\u5347\u6578\u64da\u5206\u6790\u80fd\u529b\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-168541","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168541","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=168541"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168541\/revisions"}],"predecessor-version":[{"id":168542,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168541\/revisions\/168542"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168541"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168541"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168541"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}