sql - 修改交叉连接查询

Question

我发现我想要修改这个查询，以获得额外的列并对最近 3 个月找到的金额求和。我想为此制作一份 Crystal 报告。查询如下。

SELECT 
    dbo.[@EIM_PROCESS_DATA].U_Tax_year, 
    dbo.[@EIM_PROCESS_DATA].U_Employee_ID, 
    SUM(dbo.[@EIM_PROCESS_DATA].U_Amount) AS PAYE, 
    dbo.OADM.CompnyName, 
    dbo.OADM.CompnyAddr, 
    dbo.OADM.TaxIdNum, 
    dbo.OHEM.lastName + ', ' + ISNULL(dbo.OHEM.middleName, '') + ' ' + 
        ISNULL(dbo.OHEM.firstName, '') AS EmployeeName, dbo.OHEM.govID

FROM dbo.[@EIM_PROCESS_DATA] 
        INNER JOIN dbo.OHEM ON dbo.[@EIM_PROCESS_DATA].U_Employee_ID 
                                           = dbo.OHEM.empID CROSS JOIN dbo.OADM
WHERE (dbo.[@EIM_PROCESS_DATA].U_PD_code = 'SYS033')

GROUP BY 
    dbo.[@EIM_PROCESS_DATA].U_Tax_year, 
    dbo.[@EIM_PROCESS_DATA].U_Employee_ID, 
    dbo.OADM.CompnyName, 
    dbo.OADM.CompnyAddr, 
    dbo.OADM.TaxIdNum, 
    dbo.OHEM.lastName, 
    dbo.OHEM.firstName, 
    dbo.OHEM.middleName, 
    dbo.OHEM.govID

表OHEM 包含一个名为U_Process_month 的字母数字字段，其中包含从一月到十二月的字符。正如上面的查询，SUM(dbo.[@EIM_PROCESS_DATA].U_Amount) 给出了所有 PAYE 金额的总计，ie。 U_PD_code = 'SYS033'。

我想要一个查询，根据所选的年份和月份将过去 3 个月 (PAYE) 相加。

我还想检索额外的列，SUM(dbo.[@EIM_PROCESS_DATA].U_Amount) as TAXABLEPAY where (dbo.[@EIM_PROCESS_DATA].U_PD_code = 'SYS034')。

我该如何实现这一目标？任何帮助表示赞赏。

Answer 1

我不确定 U_Tax_year 是什么数据类型，所以我将其保留为 INT。但是，此查询应返回您设置的月份之前的 3 个月。

DECLARE @start_month DATETIME;
DECLARE @start_year INT;

SET @start_month = '2013-04-01';
SET @start_year = 2013;

SELECT dbo.[@EIM_PROCESS_DATA].U_Tax_year
     , dbo.[@EIM_PROCESS_DATA].U_Employee_ID
     , SUM(CASE WHEN dbo.[@EIM_PROCESS_DATA].U_PD_code = 'SYS033' THEN dbo.[@EIM_PROCESS_DATA].U_Amount ELSE 0 END) AS PAYE
     , SUM(CASE WHEN dbo.[@EIM_PROCESS_DATA].U_PD_code = 'SYS034' THEN dbo.[@EIM_PROCESS_DATA].U_Amount ELSE 0 END) AS TAXABLEPAY
     , dbo.OADM.CompnyName
     , dbo.OADM.CompnyAddr
     , dbo.OADM.TaxIdNum
     , dbo.OHEM.lastName + ', ' + ISNULL(dbo.OHEM.middleName, '') + ' ' + ISNULL(dbo.OHEM.firstName, '') AS EmployeeName
     , dbo.OHEM.govID
  FROM dbo.[@EIM_PROCESS_DATA]INNER JOIN dbo.OHEM ON dbo.[@EIM_PROCESS_DATA].U_Employee_ID = dbo.OHEM.empID CROSS JOIN dbo.OADM
 WHERE dbo.[@EIM_PROCESS_DATA].U_PD_code IN ('SYS033', 'SYS034')
   AND dbo.OHEM.U_Process_month IN (DATENAME(MONTH, DATEADD(MONTH,-3, @start_month)), DATENAME(MONTH, DATEADD(MONTH,-2, @start_month)), DATENAME(MONTH, DATEADD(MONTH,-1, @start_month)))
   AND dbo.[@EIM_PROCESS_DATA].U_Tax_year = @start_year
 GROUP BY dbo.[@EIM_PROCESS_DATA].U_Tax_year
     , dbo.[@EIM_PROCESS_DATA].U_Employee_ID
     , dbo.OADM.CompnyName
     , dbo.OADM.CompnyAddr
     , dbo.OADM.TaxIdNum
     , dbo.OHEM.lastName
     , dbo.OHEM.firstName
     , dbo.OHEM.middleName
     , dbo.OHEM.govID;