SQL从两个单独的行、两个单独的列中减去一个值

我很难弄明白这一点。。。我正在尝试编写一个SQL查询，从该表中减去2个值：

费率表：

我需要创建一个查询，返回CBBR中Policy=12345和benefit=a的值的结果，然后减去IBBR中Policy=12345和benefit=B$1.34-0.56的值

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有什么想法吗？

你的问题需要更多的解释，根据我的理解，我认为你应该使用案例陈述作为解释-

Select 
Case when (Policy = 12345 and benefit = A) then CBBR
     When (Policy = 12345 and benefit = B) then CBBR-IBBR
END as Value
From Yourtable

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根据查询中提到的详细信息，您需要在特定条件下区分CBBR和IBBR

SELECT CBBR-
  (SELECT IBBR
   FROM RateTable
   WHERE Policy = 12345
     AND benefit = 'B') AS IBBR
FROM RateTable
WHERE Policy = 12345
  AND benefit = 'A';

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但是，如果您需要广义查询，那么我们可能会使用SUM或其他方法。

Ankit Jindal已经给出了正确的答案。但是，我想指出的是，不需要使用任何子查询，因为它们会显著降低性能。在这种特殊情况下，联接运算符就足够了：

I am not clear that you want the diff for only 1 value "B" or the pattern will go on if condition (Policy = 12345 and benefit ='A') to get the diff of next row.

ASSUMING diff you want to calculate for all next rows

select *,case when Benefit='A'AND Policy=12345 then CBBR-new_IBBR else CBBR end as diff from(
select *,lead(IBBR,1) over (order by RecordID ASC) as new_IBBR  from <TABLE NAME>)x

选择 rta.CBBR-rtb.IBBR作为结果 从作为rta的费率表 将RateTable作为rtb.Policy=rta.Policy和rtb.Benefit='B'上的rtb加入 其中Policy=12345 和受益于

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您好@suttoa，请告诉我们您尝试了什么。@suttoa，我添加了一个在这种情况下可以使用的查询，但是如果您需要任何概括，请分享更多信息。您的回答将导致$4.56-$0.56，这是错误的。您能概括一下您想要的查询行为吗。类似于在C和不同策略的情况下会发生什么。向这个代码示例添加解释将有助于改进这个答案。

I am not clear that you want the diff for only 1 value "B" or the pattern will go on if condition (Policy = 12345 and benefit ='A') to get the diff of next row.

ASSUMING diff you want to calculate for all next rows

select *,case when Benefit='A'AND Policy=12345 then CBBR-new_IBBR else CBBR end as diff from(
select *,lead(IBBR,1) over (order by RecordID ASC) as new_IBBR  from <TABLE NAME>)x