题解 | #将两个 SELECT 语句结合起来（一）#
将两个 SELECT 语句结合起来（一）
https://www.nowcoder.com/practice/a33d5c0ebf434e00b22e2977a5aa3a90
select prod_id,quantity from OrderItems
where quantity in
(
select quantity from OrderItems
where prod_id like 'BNBG%'
or quantity = 100
)
order by prod_id
select * from OrderItems where quantity = '100' union select * from OrderItems where prod_id like 'BNBG%' order by prod_id ; 两种写法
注意第一种写法是 from 之后where A in （ select A from 注意格式
