查詢，獲得結果再次查詢

Question

我想在一個語句中執行這些查詢： - 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允許你在數組中搜尋。 例如：

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

Answer 2

我認爲你可以使用這個

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

如果有困難，你可以使用這樣的子查詢：

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

希望這有助於=）