按SQL Server中的食物类型总和

Question

我是SQL新手，我正在使用SQL Server 2008.

在我的数据库中，我有3个表

1. 表Type
2. 表Invoice
3. 表Item

这是获取总金额的SQL命令：

SELECT 
   tbl_type.type,
   ((tbl_item.price * qty) - (tbl_item.price * qty * discount)) as totalAfter,
   tbl_inv.dateInv
FROM 
   tbl_type, tbl_item, tbl_inv 
WHERE 
   tbl_inv.dateInv = '2013-03-26 00:00:00' 
   AND tbl_inv.id = tbl_item.id_invoice 
   AND tbl_type.id = tbl_item.id_type
ORDER BY 
   tbl_inv.dateInv;

因此，当我运行查询时，它将返回

CHICKEN        46.000000    2013-03-26 00:00:00.000
MEAT            3.000000    2013-03-26 00:00:00.000
CHICKEN        69.000000    2013-03-26 00:00:00.000
CHICKEN        46.000000    2013-03-26 00:00:00.000
CHICKEN        69.000000    2013-03-26 00:00:00.000
MEAT            4.500000    2013-03-26 00:00:00.000

但是这样怎么办？

CHICKEN       230.000000    2013-03-26 00:00:00.000
MEAT            7.500000    2013-03-26 00:00:00.000

我会收到错误

  

列'tbl_item.price'在选择列表中无效，因为它不包含在聚合函数或GROUP BY子句中。

我在SQL中使用GROUP BY tbl_type.type

感谢您的帮助。

Answer 1

SELECT tbl_type.type,SUM((tbl_item.price * qty) - (tbl_item.price * qty * discount)) as totalAfter ,tbl_inv.dateInv
FROM tbl_type,tbl_item,tbl_inv 
WHERE tbl_inv.dateInv = '2013-03-26 00:00:00' AND tbl_inv.id=tbl_item.id_invoice AND tbl_type.id=tbl_item.id_type
Group by tbl_type.type,tbl_inv.dateInv
ORDER BY tbl_inv.dateInv,tbl_type.type;