Postgresql创建表作为插入返回

我试着表演一些像

CREATE TEMP TABLE tblname AS (
  INSERT INTO tbl2 FROM SELECT(1,1) RETURNING a,b 
);

但我有一个错误：在“INSERT”处或附近出现语法错误

---

是否可以将CREATE TABLE AS SELECT和INSERT FROM SELECT RETURNING子句组合起来？

不相关，但是：无需将

CREATE TABLE AS

语句放在括号中。

create temp table tblname as
    with i as (
        insert into tbl2 (a, b)
        select 1, 1
        returning a,b 
    )
    select a, b
    from i