不同列的Mysql最新记录

Question

我有一张桌子：发票

inv_id    cus_id    due_amt    paid      total_due
1         71        300         0        300
2         71        200         0        500
3         71        NULL        125      375
4         72        50          0        50
5         72        150         0        200

我想要结果

cus_id   total_due
71       375  
72       200

这是我想total_due的unique customer或以其他方式可以说我需要latest invoice的细节unique customer。

我试过的：

SELECT cus_id, total_due FROM invoice GROUP BY cus_id ORDER BY inv_id DESC

但这并没有给出所需的结果。

请有人可以帮助我..

Answer 1

试试这个查询：

SELECT `cus_id` as CustId, (SELECT `total_due` FROM invoice WHERE cus_id = CustId ORDER BY `inv_id` DESC LIMIT 1) as total_due FROM invoice GROUP BY cus_id