table 'sales'
id refid invoice itemid price
1  001   1501    ss01   12000

table 'purchase'
id itemid price
1  ss01   10200

table 'reference'
id refid refname
1  001   bedul


我的SQL DB中有这三个表,因此如何使用mysql query将它们变成单个表,如下所示:

table

id refid refname invoice itemid sellprice buyprice profit
1  001   bedul   1501    ss01   12000     10200    1800

最佳答案

您的结果表不够详细,但是您可以尝试以下操作:

select sales.id, sales.refid, reference.refname, sales.invoice,
sales.itemid, sales.price as sellprice, purchase.price as buyprice,
sales.price - purchase.price as profit
from sales
left outer join reference on reference.refid = sales.refid
left outer join purchase on purchase.itemid = sales.itemid

关于mysql - mysql-数据收集多个表?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/33182460/

10-13 05:26