Question

我想在一个语句中执行这些查询： - 如何？

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

使用'where'，'where in' - where in允许你在数组中搜索。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)

如果遇到困难，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" )

希望这个帮助=）

进行查询，获取结果再次进行查询

2 个答案: