连续的WITH子句

Question

在Postgres sql中，是否可以连续使用WITH语句？ e.g。

WITH t1 AS (
   ...some select statement
)

WITH t2 AS (
   ...select from t1
)

SELECT * FROM t2;

我已经尝试了上述内容但确实有效;似乎正在发挥作用？

Answer 1

使用：

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

t2 AS (
   ...select from t1
)

SELECT FROM t2;