連續WITH子句

Question

在Postgres sql中，是否可以連續使用WITH語句？例如

WITH t1 AS (
    ...some select statement 
) 

WITH t2 AS (
    ...select from t1 
) 

SELECT * FROM t2; 

我已經嘗試了上述，它似乎是工作？

Answer 1

使用：

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

t2 AS (
    ...select from t1 
) 

SELECT FROM t2;