Question

WITH L1 AS
(
   SELECT
)
SELECT A FROM L1

UNION ALL

SELECT A FROM TABLE

UNION ALL

WITH L2 AS
(
   SELECT
)
SELECT A FROM L2

UNION ALL

WITH L3 AS
(
   SELECT
)
SELECT A FROM L3

我收到错误

关键字'with'附近的语法不正确。如果此语句是公用表表达式或xmlnamespaces子句，则必须以分号结束前一个语句。“

请帮忙

Answer 1

您无法在查询表达式的中间中使用WITH。 WITH用于构建中间查询，以供其他查询立即使用（意味着它不能被多个独立查询使用）。

所以你可能想要这样的东西：

WITH L1 
AS
(
    SELECT ...
),
L2 AS
(
    SELECT ...
),
L3 AS
(
    SELECT ...
)

// begin final query    
SELECT A FROM L1
UNION ALL
SELECT A FROM TABLE
UNION ALL
SELECT A FROM L2
UNION ALL
SELECT A FROM L3

Answer 2

语法是

With l1 ( a ) as ( Select ... )
   , l2 ( a ) as ( ... )
  Select ... From ...
  Union
  Select ... From ...

Answer 3

两种方法：

SELECT A FROM L1
UNION ALL
SELECT A FROM L2
UNION ALL
SELECT A FROM L3

OR

WITH CTE_L AS
(
    SELECT A FROM L1
    UNION ALL
    SELECT A FROM L2
    UNION ALL
    SELECT A FROM L3
)
SELECT * FROM CTE_L

通过union all使用多个with语句

3 个答案: