MS Access SUMIIF to SQL CASE 语句

Question

我正在尝试将 MS Access 查询转换为 SQL，我正在努力寻找正确的方法。

MS Access 行是：Records Loaded: Sum(IIf([cmp_CampaignTable].>[ContactID]>0,1,0))

我目前的SQL代码是：

SELECT        Project.ProjectName, 
                cmp_UKWarranty.ProjectID, 
                SUM(CONVERT(numeric,(CASE WHEN (cmp_UKWarranty.ContactID) >0,1,0) AS RecordsLoaded
FROM            cmp_UKWarranty INNER JOIN
                         Project ON cmp_UKWarranty.ProjectID = Project.ProjectID INNER JOIN
                         Dial ON cmp_UKWarranty.DialID = Dial.DialID CROSS JOIN
                         CRC 

我没有其他人要问，有没有人能在这里指出我正确的方向？

亚当

Answer 1

语法错误时的情况：

SELECT Project.ProjectName,
       cmp_UKWarranty.ProjectID,
       Sum(CASE
             WHEN ( cmp_UKWarranty.ContactID > 0 ) THEN 1
             ELSE 0
           END)
FROM   cmp_UKWarranty
       INNER JOIN Project
               ON cmp_UKWarranty.ProjectID = Project.ProjectID
       INNER JOIN Dial
               ON cmp_UKWarranty.DialID = Dial.DialID
       CROSS JOIN CRC 

Answer 2

你快到了。您需要then 和else。此外，无需转换为“数字”：

SELECT p.ProjectName, w.ProjectID,
       SUM(CASE WHEN w.ContactID > 0 THEN 1 ELSE 0) AS RecordsLoaded
FROM cmp_UKWarranty w INNER JOIN
     Project p
     ON w.ProjectID = p.ProjectID INNER JOIN
     Dial d
     ON w.DialID = Dial.d CROSS JOIN
     CRC