sql - 多个 CTE where 子句引用 CTE 列

Question

例如

WITH UserDetail (UserId, UserName)
AS
(
    SELECT TOP(10) U.UserId,U.UserName
    FROM UserTable U        
),
UserAction (ActionName,ActionType)
AS
(
    SELECT TOP(10) A.ActionName,A.ActionType
    FROM ActionTable A
    WHERE A.UserId = UserDetail.UserId // Is it possible to direct reference  
)
WHERE A.UserId = UserDetail.UserId

我可以直接执行此操作而不是在我的第二个 CTE 中加入 UserDetail 吗。

我收到以下错误:

multi-part of identifier "UserDetail.UserId" could not be found

在 CTE 引用中，是否可以在不加入 CTE 表的情况下引用以前的 CTE？或者我写了一个错误的查询

Answer 1

你可以像这样使用 - 加入 UserDetail cte

WITH UserDetail (UserId, UserName)
AS
(
    SELECT TOP(10) U.UserId,U.UserName
    FROM UserTable U        
),
UserAction (ActionName,ActionType)
AS
(
    SELECT TOP(10) A.ActionName,A.ActionType
    FROM ActionTable A inner join UserDetail
    on A.UserId = UserDetail.UserId
)

或者你可以使用子查询

WITH UserDetail (UserId, UserName)
    AS
    (
        SELECT TOP(10) U.UserId,U.UserName
        FROM UserTable U        
    ),
    UserAction (ActionName,ActionType)
    AS
    (
        SELECT TOP(10) A.ActionName,A.ActionType
        FROM ActionTable A
        where A.UserId in (select UserDetail.UserId from UserDetail)
    )