要实现不同CTE的UNION,可以按照以下步骤进行操作:
示例代码:
WITH cte1 AS (
SELECT column1, column2
FROM table1
WHERE condition1
),
cte2 AS (
SELECT column3, column4
FROM table2
WHERE condition2
)
示例代码:
SELECT column1, column2
FROM cte1
UNION
SELECT column3, column4
FROM cte2
完整示例代码:
WITH cte1 AS (
SELECT column1, column2
FROM table1
WHERE condition1
),
cte2 AS (
SELECT column3, column4
FROM table2
WHERE condition2
)
SELECT column1, column2
FROM cte1
UNION
SELECT column3, column4
FROM cte2
这样就可以将不同CTE的结果合并在一起,形成一个包含所有列的结果集。注意,UNION会自动去重,如果不需要去重,可以使用UNION ALL关键字。
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