PostgreSQL插入數組多對多關係

Question

讓許多用戶屬於許多組。

編寫一個函數，該函數創建一個包含name和用戶列表的組。

Answer 1

CREATE FUNCTION groups_create(varchar(50), bigint[]) RETURNS SETOF bigint AS 
$$ 
    WITH g AS (
     INSERT INTO groups (name) 
     VALUES ($1) 
     RETURNING id 
    ), gm AS (
     INSERT INTO group_members 
     SELECT id, unnest($2) FROM g 
    ) 
    SELECT id FROM g 
$$ 
LANGUAGE SQL; 

http://sqlfiddle.com/#!15/9e408/9