Question

我使用以下查询根据单个条件计算特定列数据。

SELECT COUNT(DISTINCT(S.INVOICENO)) AS LESSTWO , YEAR(S.invoicedate) YER, 
    Month(S.invoicedate) MNTH
FROM SALESDATA S 
where S.BILLINGTYPE='INVOICE' 
    AND (S.invoicedate >='4-1-2009' and S.invoicedate <='4-30-2010')
    AND S.TAXABLEAMT <=2000
GROUP BY YEAR(S.invoicedate) ,Month(S.invoicedate) 
ORDER BY YEAR(S.invoicedate) ,Month(S.invoicedate)

但是我必须再计算3个条件。是否有可能根据3个条件（即2001 - 3000,3001 - 4000,4001 - 5000，> 5000）计算，我想要所有条件的结果集？

此致

N.SRIRAM

Answer 1

我认为你真的需要将查询分成3个不同的查询 - 每个查询需要一个

Answer 2

未经测试，但应该是正确的：

SELECT CASE
          WHEN S.TaxableAmt <= 2000 THEN '<=2000'
          WHEN S.TaxableAmt <= 3000 THEN '2001-3000'
          WHEN S.TaxableAmt <= 4000 THEN '3001-4000'
          ELSE '>5000'
       END as Bracket,
COUNT(DISTINCT(S.INVOICENO)) AS LESSTWO , YEAR(S.invoicedate) YER, 
    Month(S.invoicedate) MNTH
FROM SALESDATA S 
where S.BILLINGTYPE='INVOICE' 
    AND (S.invoicedate >='20090401' and S.invoicedate <='20100430')
GROUP BY
      CASE
          WHEN S.TaxableAmt <= 2000 THEN '<=2000'
          WHEN S.TaxableAmt <= 3000 THEN '2001-3000'
          WHEN S.TaxableAmt <= 4000 THEN '3001-4000'
          ELSE '>5000'
       END,
YEAR(S.invoicedate) ,Month(S.invoicedate) 
ORDER BY YEAR(S.invoicedate) ,Month(S.invoicedate)

你必须在GROUP BY子句中重复case表达式（或者将它全部放在子查询中），并且我已经修复了你的日期常量，以便它们是明确的。

如何在sql server中使用单个查询计算不同条件的列数据？

2 个答案: