题解 | 库存分析
库存分析
https://www.nowcoder.com/practice/ba321f739f41474f998f16ac550d34ac
select
a.商品号,
a.尺码,
sum(b.库存数) / sum(a.近7天销量) as 存销比
from
订单表 a
left join
库存表 b on a.商品号 = b.商品号 and a.尺码 = b.尺码
group by
1,2
order by
1,field(a.尺码,'S','M','L','XL')
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