查询，获得结果再次查询

Question

我想在一个语句中执行这些查询： - 如何TO？

SELECT count(id) as levela FROM `member` where parent_id in (SELECT id FROM `member` where parent_id in (SELECT id FROM `member` where parent_id = 2)) 

SELECT count(id) as levelb FROM `member` where parent_id in (SELECT id FROM `member` where parent_id = 2) 

SELECT count(id) as levelb FROM `member` where parent_id = 2 

Answer 1

改用'where'，'where in' - where in允许你在数组中搜寻。 例如：

Select id from member where parent_id IN (here array ($y)) 

Answer 2

我认为你可以使用这个

SELECT id FROM member where parent_id IN (x, y, z) 

如果有困难，你可以使用这样的子查询：

SELECT id FROM member where parent_id IN (SELECT id FROM list_parent_id WHERE "condition you want to find") 

希望这有助于=）