id. goods quantities
2 milk 1
3 copies 1
2 milk 1
如何用sql语法显示...
Id goods quantities
2 milk 2
3 coffies 1
因为有牛奶的副本然后添加了数量。
问答案..谢谢
您希望按id
和goods
对行进行分组,并且您希望对这些值进行求和,因此您要查找的SQL函数是GROUP BY
和SUM
:
select id, goods, sum(quantities)
from yourTable
group by id, goods