连续的 WITH 子句

Question

在 Postgres sql 中，是否可以有连续的 WITH 语句？例如

WITH t1 AS (
   ...some select statement
)

WITH t2 AS (
   ...select from t1
)

SELECT * FROM t2;

我已经尝试过上述方法，但似乎没有用？

Answer 1

使用：

WITH t1 AS (
   ...some select statement
),

t2 AS (
   ...select from t1
)

SELECT FROM t2;

Consecutive WITH clauses