如何将SQL行设置为标量变量？

Question

我有两张桌子。他们有一列表明它是股票还是坏股票。现在我想在状态'Y'时设置值，这意味着总的坏库存值和＆amp;当来自销售的状态'N'总库存值＆amp;销售退货表。

这是我的代码：

SELECT 
    sr.IsBadStock as Status,
    CASE 
       WHEN sr.IsBadStock = 'Y' 
          THEN (SUM(srd.Qty)) 
       WHEN sr.IsBadStock = 'N' 
          THEN SUM(srd.Qty)
    END
FROM
    SaleReturn sr, SaleReturnDetail srd
WHERE 
    sr.SaleInvNo = srd.SaleInvNo 
    AND sr.Department = srd.Department 
    AND sr.Company = srd.Company
GROUP BY 
   sr.IsBadStock

这是我的输出：

Status | (no column name)
-------+------------------
N      |   60
Y      |   390

我希望这两个值设置标量变量，其中第一行的名称为@stockQty＆amp;第二行@badStockQty，以便我以后可以进行一些计算。有可能吗？

Answer 1

使用MS SQL Server

DECLARE @Good int
       ,@bad int

SELECT @bad =
          SUM(
              CASE
                  WHEN r.IsBadStock = 'Y' THEN [Qty]
                  ELSE 0
              END),
      @Good =
          SUM(
              CASE
                  WHEN r.IsBadStock = 'N' THEN [Qty]
                  ELSE 0
              END)
FROM Returned r

PRINT @good
PRINT @bad

Answer 2

好像你想要一个基本的GROUP BY：

SELECT 
    sr.IsBadStock as Status,
    SUM(srd.Qty)
FROM
    SaleReturn sr
JOIN SaleReturnDetail
  ON  sr.SaleInvNo = srd.SaleInvNo 
  AND sr.Department = srd.Department 
  AND sr.Company = srd.Company
GROUP BY 
   sr.IsBadStock

请注意切换到现代的，明确的JOIN语法。