Question

我写了一个查询来生成数据透视。该代码运行得很好。代替对值（“ 1”，“ 2”，“ 3”）进行硬编码，是否可以编写子查询？

SELECT *
FROM (
    SELECT * from #Registered2
) as s
PIVOT
(
    SUM(s.Registered_customer_Count)
    FOR [Offer_cover_id] IN ("1","2","3")
)AS pvt

Answer 1

DECLARE @cols AS NVARCHAR(MAX),
    @query  AS NVARCHAR(MAX);

SET @cols = STUFF((SELECT distinct ',' + QUOTENAME(c.[Offer_cover_id]) 
            FROM #Registered2 c
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')


set @query = 'SELECT  ' + @cols + ' from 
            (
                select*
                from Registered2 
           ) x
            pivot 
            (
                 SUM(Registered_customer_Count)
                for [Offer_cover_id] in (' + @cols + ')
            ) p '


execute(@query)

SQL中PIvot表的子查询

1 个答案: