Select CTE 中子查询的结果

Question

我正在使用其中包含子查询的 CTE。然后我尝试从 CTE 中的子查询结果中 select，但我收到 Invalid Column Name 错误。

查询：

DECLARE @User AS VARCHAR(50)
SET @User = 'test.user'

WITH cte AS (
SELECT 
    o.db_OrderNo,
    o.db_Deferral
FROM
    tblOrders o
    LEFT JOIN tblUserProfile up on up.db_UserId = o.db_RTS
WHERE
    o.db_Deleted = 0
    AND (select OrderBucketId from Main.udfGetOrderStatusStepInfoByOrderNo(o.db_OrderNo) as Task) IN (1, 2, 3, 4)
    AND up.db_Email LIKE @User + '%'
)
SELECT COUNT(DISTINCT (CASE WHEN Task = 1 AND db_Deferral = 0 THEN db_OrderNo
                   END)) as OrderInEvalCount,
   COUNT(DISTINCT (CASE WHEN Task = 2 AND db_Deferral = 0 THEN db_OrderNo
                   END)) as OrderInDfcCount,
   COUNT(DISTINCT (CASE WHEN Task IN (3, 4) AND (select OrderStepId from Main.udfGetOrderStatusStepInfoByOrderNo(o.db_OrderNo)) NOT IN (37, 39) AND
                             db_Deferral = 0 THEN db_OrderNo
                   END)) as OrderWipCount,
   COUNT(DISTINCT (CASE WHEN db_Deferral <> 0 THEN db_OrderNo
                   END)) as OrderInPendedCount
FROM cte;

它没有将 Task 识别为一个列。不太习惯做子查询，所以格式可能是错误的。不确定 temp table 是否可以提供帮助。任何帮助将不胜感激。

Answer 1

您的子查询在 WHERE 子句中。列仅来自 FROM 子句。您可以通过多种方式处理此问题。如果您知道子查询不 return 重复，则使用 CROSS APPLY:

将逻辑移动到 FROM 子句

WITH cte AS (
      SELECT o.db_OrderNo, o.db_Deferral
      FROM tblOrders o LEFT JOIN
           tblUserProfile
           up on up.db_UserId = o.db_RTS CROSS APPLY
           Main.udfGetOrderStatusStepInfoByOrderNo(o.db_OrderNo) t
      WHERE o.db_Deleted = 0 AND
            t.OrderBucketId  IN (1, 2, 3, 4) AND
            up.db_Email LIKE @User + '%'
     )

Select CTE 中子查询的结果

Select result of subquery in CTE

sql

sql-server

subquery

common-table-expression

sql-server-2008