sql - CTE 内的 CTE

Question

是否可以在 CTE 内编写 CTE？

我希望它遵循这个逻辑，但解释器不喜欢这段代码。

with outertest as(

    with test as (
        select 
            SRnum, 
            gamenumber, 
            StartOfDistribution, 
            ApplicationNumber   
        from #main
        where startofdistribution = '2011-06-14 00:00:00.000'
        and SRnum = '313'
        --order by SRnum, gamenumber, StartOfDistribution, ApplicationNumber
    )
    select
        ApplicationNumber
        ,count(*) as RetailerAppearance
    from test
    group by ApplicationNumber
    having count(*) = 4

) select count(*) from outertest

Answer 1

您不能像在 SQL Server 中那样嵌套 CTE，但可以通过以下方式使用多个 CTE:

;with test as 
(
    select 
        SRnum, 
        gamenumber, 
        StartOfDistribution, 
        ApplicationNumber   
    from #main
    where startofdistribution = '2011-06-14 00:00:00.000'
    and SRnum = '313'
    --order by SRnum, gamenumber, StartOfDistribution, ApplicationNumber
),
 outertest as
 (
    select
        ApplicationNumber
        ,count(*) as RetailerAppearance
    from test
    group by ApplicationNumber
    having count(*) = 4
) 
select count(*) 
from outertest