TSQL 仅在另一列中满足条件时对一列进行分组

Question

本查询结果有多个transactionCodes。我只想在 applyToLineID = '0' 时对 transactionCodes 进行分组。换句话说，如果 applyToLineID 不是 0，则不应对事务代码进行分组。我认为这可以用 HAVING 语句来完成，但我无法让它工作。下面你会发现2段代码，第一段是我的原始代码，第二段是原始代码加上我尝试进行上述分组。

原码：

SELECT 
ar.arlineitemid,
ar.siteid,
ar.transactioncode,
ar.description,
ar.amount,
ar.balance,
ar.applytolineid,
ar.posteddate,
TC.transactioncode,
TC.arlineitemid

FROM tswdata.dbo.t_arlineitem as AR     

left JOIN

(
SELECT

ar2.transactioncode,
ar2.arlineitemid

FROM tswdata.dbo.t_arlineitem as ar2    

WHERE  

ar2.SiteID = '101'
AND
(AR2.Transactioncode LIKE 'A%'  And
AR2.Transactioncode NOT LIKE 'AS%' And
AR2.Transactioncode NOT LIKE 'AF%' And
AR2.Transactioncode NOT LIKE 'AX%')
) TC

ON
ar.applytolineid = TC.arlineitemid

WHERE  

ar.SiteID = '101'
AND
AR.Transactioncode <> 'A18'

我尝试执行条件分组的代码：

SELECT 
ar.arlineitemid,
ar.siteid,
ar.transactioncode,
ar.description,
ar.amount,
ar.balance,
ar.applytolineid,
ar.posteddate,
TC.transactioncode,
TC.arlineitemid

FROM tswdata.dbo.t_arlineitem as AR     

left JOIN

(
SELECT

ar2.transactioncode,
ar2.arlineitemid

FROM tswdata.dbo.t_arlineitem as ar2    

WHERE  

ar2.SiteID = '101'
AND
(AR2.Transactioncode LIKE 'A%'  And
AR2.Transactioncode NOT LIKE 'AS%' And
AR2.Transactioncode NOT LIKE 'AF%' And
AR2.Transactioncode NOT LIKE 'AX%')
) TC

ON
ar.applytolineid = TC.arlineitemid

WHERE  

ar.SiteID = '101'
AND
AR.Transactioncode <> 'A18'

GROUP BY 
ar.transactioncode,

HAVING
ar.ApplyTolineId = '0'

Answer 1

您可以合并两个查询：一个包含除事务代码为 0 的项目之外的所有内容，另一个仅包含事务代码为 0 的项目的集合。

Answer 2

考虑像这样分解你的问题：

您有两组数据要查看 - 一组 applyToLineID = '0' 和一组 applyToLineID <> '0'.

您有一个查询可以提取两个集合将用于评估 applyToLineID 逻辑的原始信息。

您的解决方案可能类似于：

SELECT * FROM
    (select common data, Grouped Values from (common_query) where applyToLineID = 0)
UNION
SELECT * FROM
    (select common data, unGrouped Values from (common_query) where applyToLineID <> 0)

TSQL 仅在另一列中满足条件时对一列进行分组

TSQL only group a column when a condition is met in another column

tsql

having