sql - ( CASE WHEN [date] IS NULL THEN 0 ELSE 1 END)在我的枢轴中不起作用

Question

我编写了以下代码，期望在 CASES 中返回 0 和 1，但我得到的是 1 和 NULL。

有什么获取 0 的建议吗？

DECLARE @Today DATETIME

SET @Today = FLOOR(CAST(GETDATE() AS FLOAT))

SELECT*

FROM 
    (   SELECT e.[Employeenr],
           e.[Name],
           dc.[Code],
           c.[Description],
           (CASE WHEN ec.[date] IS NULL THEN 0 ELSE 1 END) as 'Date',
           (CASE WHEN dc.[creationdate] IS NULL THEN 0 ELSE 1 END) as 'Aanwezig'
FROM HR_Employee e
        left join HR_EmployeeDriverLicense d ON e.[Employeenr] = d.[Employee]
        left join DriverLicenseCategory dc ON d.[DriverLicenseCategory] = dc. 
        [DriverLicenseCategorynr]
        left join HR_EmployeeCertificate ec ON e.[Employeenr] = ec.[Employee]
        left join HR_Certificate c ON ec.[Certificate] = c.[Certificatenr]
        left join HR_Function f ON e.[Function] = f.[Functionnr]

     WHERE (e.[Date_out_of_employment] IS NULL 
        or e.[Date_out_of_employment] >= @today 
        or e.[Licensenumber] is not null) 
        and e.[LicenseExpireDate] is not null 
        and c.[Description] is not null 
        and ec.[Certificate] <> 5 
        and f.[Functionnr] = 1

 ) AS SRC 
 PIVOT
 ( MAX(Aanwezig) 
  FOR [Code] IN ([C], [C1], [C1E], [CE])) AS PivotTable 

  PIVOT
 ( MAX ([Date]) 
    FOR [Description] IN ([Kooiaap certificaat], [ADR Certificaat])) AS PivotTable 

Answer 1

当您执行 PIVOT 时，您将得到行的 NULL，这些行没有相应 PIVOT 列的值。不幸的是，如果你想得到 0 而不是 NULL，你需要在最后的 SELECT 语句中添加这个逻辑。

像这样:

SELECT ISNULL([Kooiaap certificaat], 0), ISNULL([ADR Certificaat], 0)