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题解 | #列出供应商及其可供产品的数量#

select v.vend_id, count(p.prod_id) from Vendors v left join Products p on v.vend_id = p.vend_id group by v.vend_id order by vend_id

Mysql

2022-06-28

0 199

题解 | #将两个 SELECT 语句结合起来（二）#

两条 select select prod_id,quantity from OrderItems where quantity = 100 union select prod_id,quantity from OrderItems where prod_id like "BNBG%...

Mysql

2022-06-28

2 301