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sql 面试题(一)

其生 2022-10-22 阅读 147

表一:

sql 面试题(一)_x

 

 

表二:

sql 面试题(一)_x_02

 

 

-- 问题,表一是总库存表,表二是销售记录表求剩余库存
SELECT
tsi.type,
(tsi.last_count - if(t.sales,
t.sales,
0)
) as remaining_invetory
from
t_shop_info tsi
left join (
SELECT
type as type_a ,
sum(sale_count) as sales
from
t_sale_info
group by
type
) t on
tsi.`type` =

 



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