{"id":3038,"date":"2023-07-27T17:51:13","date_gmt":"2023-07-27T09:51:13","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/index.php\/uncategorized\/mysql%e7%bb%9f%e8%ae%a1%e4%b8%8d%e5%90%8c%e5%8c%ba%e9%97%b4%e7%9a%84%e6%95%b0%e6%8d%aesum%e5%92%8ccount\/"},"modified":"2023-07-27T17:51:13","modified_gmt":"2023-07-27T09:51:13","slug":"mysql%e7%bb%9f%e8%ae%a1%e4%b8%8d%e5%90%8c%e5%8c%ba%e9%97%b4%e7%9a%84%e6%95%b0%e6%8d%aesum%e5%92%8ccount","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/mysql\/mysql%e7%bb%9f%e8%ae%a1%e4%b8%8d%e5%90%8c%e5%8c%ba%e9%97%b4%e7%9a%84%e6%95%b0%e6%8d%aesum%e5%92%8ccount\/","title":{"rendered":"Mysql\u7edf\u8ba1\u4e0d\u540c\u533a\u95f4\u7684\u6570\u636eSum\u548cCount"},"content":{"rendered":"\n\n
\n <\/path> \n <\/svg> <\/p>\n

<\/a>Mysql\u7edf\u8ba1\u4e0d\u540c\u533a\u95f4\u7684\u6570\u636e<\/h1>\n

<\/a>1.sum(if(\u8868\u8fbe\u5f0f,1,0))<\/h3>\n
select<\/span> count<\/span>(<\/span>*<\/span>)<\/span>,<\/span>sum<\/span>(<\/span>if<\/span>(<\/span>amount<=<\/span>10<\/span>,<\/span>1<\/span>,<\/span>0<\/span>)<\/span>as<\/span> `<\/span>\u6570\u91cf\u5c0f\u4e8e10<\/span>`<\/span>,<\/span>sum<\/span>(<\/span>if<\/span>(<\/span>amount><\/span>10<\/span> and<\/span> amount<=<\/span>20<\/span>,<\/span>1<\/span>,<\/span>0<\/span>)<\/span>as<\/span> `<\/span>\u6570\u91cf\u5c0f\u4e8e20<\/span>\u5927\u4e8e10<\/span>`<\/span>\nfrom<\/span> orders;<\/span>\n<\/code><\/pre>\n
\u7edf\u8ba1\u603b\u5ba2\u6237\u6570\uff0c\u548c\u9500\u91cf\u5728\uff080,10]\u7684\u5ba2\u6237\u6570\uff0c(10,20]\u7684\u5ba2\u6237\u6570\u6240\u7528\u8868orders\u4e3a:<\/p>\n\n\n\n\n\n\n\n\n\n
Company<\/th>\namount<\/th>\n<\/tr>\n<\/thead>\n
Ajjhd<\/td>\n2<\/td>\n<\/tr>\n
Daljj<\/td>\n12<\/td>\n<\/tr>\n
Rajs<\/td>\n9<\/td>\n<\/tr>\n
Fghsd<\/td>\n14<\/td>\n<\/tr>\n
\u2026<\/td>\n\u2026<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
<\/a>2.count(if(\u8868\u8fbe\u5f0f,true,null))<\/h3>\n
\n
\u89e3\u6790\uff1a<\/p>\n
    \n
  1. sum\uff08if(category=1,size,0))\u4e2d sum\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u503c\u7c7b\u578b\u7684\u6570\u503c\uff0c\u5982\u679ccategory=1,\u5219\u8fd4\u56desize,\u5982\u679ccategory\u4e0d\u7b49\u4e8e1\u5c31\u8fd4\u56de0\u3002<\/li>\n
  2. count(if(category=1,true,null))\u4e2dcount\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c\u7c7b\u578b\u7684\u6570\u503c\uff0c\u5982\u679ccategory=1,\u8fd4\u56detrue,\u5982\u679ccategory\u4e0d\u7b49\u4e8e1\u8fd4\u56denull\uff0c\u5982\u679c\u5199\u6210count(If(category=1,1,0) \u5219\u8fd4\u56de\u7684\u5168\u662ftrue,\u4e5f\u5c31\u662f\u8bf4\u5168\u90fd\u4f1a\u8ba1\u6570\uff0c\u800ccount()\u95f4\u65ad\u5185\u5bb9\u662ftrue\u8fd8\u662fnull,\u5982\u679c\u4e0d\u662fnull\u5c31\u8ba1\u6570\uff0c\u5982\u679c\u662fnull\u5c31\u4e0d\u8ba1\u6570\u3002<\/li>\n<\/ol>\n<\/blockquote>\n<\/div>\n\n\n
    \u672c\u7bc7\u6587\u7ae0\u6765\u6e90\u4e8eCSDN\uff1ahttps:\/\/blog.csdn.net\/qq_35297368\/article\/details\/120185661<\/p>\n","raw":"","protected":false},"excerpt":{"rendered":"
    Mysql\u7edf\u8ba1\u4e0d\u540c\u533a\u95f4\u7684\u6570\u636e 1.sum(if(\u8868\u8fbe\u5f0f,1,0)) select count(*),sum(if(amount&l …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[3],"tags":[],"class_list":["post-3038","post","type-post","status-publish","format-standard","hentry","category-mysql"],"post_thumbnail_image":"","content_first_image":null,"post_medium_image_300":"","post_thumbnail_image_624":"","post_frist_image":null,"post_medium_image":"","post_large_image":"","post_full_image":"","post_all_images":[],"videoAdId":"","listAd":"0","listAdId":"","listAdEvery":6,"total_comments":0,"category_name":"MySQL","post_date":"2023-07-27","like_count":"0","praiseWord":"\u9f13\u52b1","copyright_state":"","excitationAd":"0","rewardedVideoAdId":"","detailAdId":"","detailAd":"0","enterpriseMinapp":"0","audios":[],"postImageUrl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230519082947553.jpg","avatarurls":[],"related_posts":null,"pageviews":349,"next_post_id":3024,"next_post_title":"\u9762\u8bd5\u5b98\uff1aMySQL \u4e0a\u4ebf\u5927\u8868\uff0c\u5982\u4f55\u6df1\u5ea6\u4f18\u5316\uff1f","previous_post_id":3020,"previous_post_title":"\u6570\u636e\u8131\u654f\u7684 3 \u79cd\u5e38\u89c1\u65b9\u6848\uff0c\u597d\u7528\u5230\u7206\uff01","_links":{"self":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/3038","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/comments?post=3038"}],"version-history":[{"count":0,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/3038\/revisions"}],"wp:attachment":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/media?parent=3038"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/categories?post=3038"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/tags?post=3038"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}