SQL查询选择在同一列中具有不同值的子记录的父类。

This database has a one-to-many relationship where the parent table, Customers, is a list of customers and the child table, Orders, is a list of things they have bought. I'm trying to develop a query to select customers who have bought BOTH a television and a couch. The following query is returning 0 results.This database has a one-to-many relationship wh