典型的情况是,我有一个带有一定数量的物品的真正简单明了。
我想做的是:
SELECT SUM(price * quantity) as total FROM products WHERE product_id IN (1,2,3,4);
但是,由于数量没有在数据库中,我如何将数量与产品挂钩?
是否有其他办法用低价计算?
也许你只能归还产品bu价清单,然后将清单乘以所附数量。
SELECT product_id, price FROM products WHERE product_id IN (1,2,3,4);
然后从您的国名中删除并乘以数量(如从Sql的国名表中获得的国名清单)
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