Question

我在数据库中有三个表，并希望在一个SELECT语句中进行求和和比较。

逻辑是，如果一篇文章库存不足，应该选择它。如果表quantity中具有相同artID的所有行的汇总Articles in stock（一篇文章可能在表中有多行，因此需要进行汇总），则文章运行较低或者等于行warning中的列ID和相应的warehouse。这也是Articles特定的，这意味着文章可以在一个仓库中完全库存，同时在另一个仓库中运行较低。这就是为什么需要总结在特定仓库上分组的原因。还需要有关哪个仓库运行不足的信息，例如文章的artNr，可以在表Articles +----+-------+---------+ | ID | artNr | warning | +----+-------+---------+ | 1 | LA08 | 5 | | 2 | LA09 | 10 | | 3 | LA58 | 0 | +----+-------+---------+ warehouse +----+-------+ | ID | artID | +----+-------+ | 3 | 1 | | 4 | 1 | | 5 | 2 | +----+-------+ Articles in stock +----+-------+-------------+----------+ | ID | artID | warehouseID | quantity | +----+-------+-------------+----------+ | 1 | 1 | 3 | 10 | | 2 | 1 | 5 | 15 | | 3 | 2 | 5 | 45 | | 4 | 1 | 3 | 20 | | 5 | 3 | 5 | 4 | +----+-------+-------------+----------+

中找到

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Please try it.

Answer 1

select a.id, s.warehouseID, sum(s.quantity)
from articles a 
join articles_in_stock s on a.id = s.artID
group by a.id, s.warehouseID
having sum(s.quantity) <= a.warning

具有COMPARE（HAVING）和GROUP的MYSQL或SQL SELECT

1 个答案: