Question

我是一个SQL菜鸟，所以在这里寻求帮助。我有一个示例查询，如下所示。现在我想修改查询，以便我可以对同一查询中的Test，Test1和Test2值执行以下操作：

OutputValue = Test + Test1 - Test2

然后显示OutputValue的结果以及Test，Test1＆amp; TEST2。

SELECT
    CAST(balancefwd.Shares AS NUMERIC) / 1000 AS Test, 
    SUM(CAST(booksdata.sharesissued AS NUMERIC) / 1000) AS Test1, 
    SUM(CAST(booksdata.sharesretired AS NUMERIC) / 1000) AS Test2
FROM
    SQLTest.TestBooks.dbo.booksdata booksdata
JOIN
    SQLTest.TestBooks.dbo.balancefwd balancefwd ON booksdata.companynumber = balancefwd.companynumber
WHERE
    booksdata.CompanyNumber= '<number>' 
GROUP BY 
    balancefwd.shares

有什么建议吗？

Answer 1

您可以将查询包装在另一层中：

SELECT t.*, t.test + t.test1 - t.test2 as total
FROM (Select cast(balancefwd.Shares as numeric)/1000 as  Test, 
             sum(cast(booksdata.sharesissued as numeric)/1000)as  Test1,
             sum(cast(booksdata.sharesretired as numeric)/1000)as  Test2
      from SQLTest.TestBooks.dbo.booksdata booksdata
      join SQLTest.TestBooks.dbo.balancefwd balancefwd on booksdata.companynumber=balancefwd.companynumber
      where booksdata.CompanyNumber= '<number>')

然后可以使用派生列。

虽然你的查询看起来有点不对..你想在这做什么？为什么没有分组条款？表中只有1条记录吗？为什么要总结test1和test2而不是test？

Answer 2

以下是问题的答案：给子查询命名（t1）我能够对派生值执行算术运算。

Select t1.Test, t1.Test1, t1.Test2, t1.Test+t1.Test1-t1.Test2  as OutputValue from
(SELECT
     CAST(balancefwd.Shares AS NUMERIC) / 1000 AS Test, 
     SUM(CAST(booksdata.sharesissued AS NUMERIC) / 1000) AS Test1, 
     SUM(CAST(booksdata.sharesretired AS NUMERIC) / 1000) AS Test2
 FROM
     SQLTest.TestBooks.dbo.booksdata booksdata
 JOIN
     SQLTest.TestBooks.dbo.balancefwd balancefwd ON booksdata.companynumber = balancefwd.companynumber
 WHERE
     booksdata.CompanyNumber= '<number>' 
 GROUP BY 
     balancefwd.shares) t1

SQL Server：对通过查询返回的值执行算术运算

2 个答案: