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mysql sum if

SELECT SUM(if(gy is null,quan,gy)) FROM `表名` WHERE time='20220214' AND rjid='DTH' AND name='前腿瘦肉' AND dm<>'' 查询 计数(if(判断条件，为真执行，为假执行)) FROM jl WHERE 查询条件SELECT SUM(if(判断列值,为真取,为假取)) FROM `表名`...

  • 晚风
  • February 14, 2022
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    关于JavaScript的DOM操作一

    <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> ...

  • 晚风
  • February 1, 2022
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    Ajex提交GET、Post请求的方法

    POST请求 var xhr = new XMLHttpRequest(); // 2监听请求 xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { conso...

  • 晚风
  • February 1, 2022
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    关于phpcomposer安装的一些坑

    折腾了两天 我特喵的也真是服了安装方法 官方进入网站根目录 然后执行如下命令php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" php -r "if (hash_file('sha384', 'composer-setup.php') === '906a84df04...

  • 晚风
  • January 28, 2022
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    Composer\Downloader\TransportException] curl error 61 while

    使用composer下载扩展包的时候报错：[ComposerDownloaderTransportException]curl error 61 while downloading https://mirrors.aliyun.com/composer/p2/topthink/think-multi-app.json: Error while processing content unenc...

  • 晚风
  • January 27, 2022
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