此查询返回不在“group-of-users”组中的所有用户。
要使用此查询，只需将“group-of-users”更改为组的 slug。您将获得不在“group-of-users”组中的用户的用户名列表。
不在组中的所有用户
-- [params]
-- string :group_name = group-of-users
WITH group_members AS(
SELECT
u.username, u.id AS user_id, g.name
FROM users u
JOIN group_users gu
ON gu.user_id = u.id
JOIN groups g
ON g.id = gu.group_id
WHERE g.name = :group_name
),
all_users AS(
SELECT
u.username
FROM users u
)
SELECT all_users.username
FROM all_users
EXCEPT
SELECT group_members.username
FROM group_members
为了完整起见，这里有一个获取“group-of-users”组中所有用户的查询。
组中的所有用户
-- [params]
-- string :group_name = group-of-users
SELECT
u.username, u.id AS user_id, g.name
FROM users u
JOIN group_users gu
ON gu.user_id = u.id
JOIN groups g
ON g.id = gu.group_id
WHERE g.name = :group_name