Question

表：

CS(sid,cid) both int

Courses(id,price) both int


SELECT CS.sid,SUM(Courses.price) as sum FROM CS INNER JOIN Courses ON CS.cid=Courses.id AND CS.sid=@sid GROUP BY CS.sid

我想要价格sum of courses of sid=@sid。 @sid是SQLDataSource的参数。

我得到这个例外：类型＆＃39; System.Data.OleDb.OleDbException' occurred in System.Web.dll的例外情况，但未在用户代码中处理

Additional information: The SELECT statement includes a reserved word or an argument name that is misspelled or missing, or the punctuation is incorrect.

Answer 1

您可能需要使用WHERE

SELECT CS.sid,SUM(Courses.price) as sum FROM CS INNER JOIN Courses ON CS.cid=Courses.id WHERE CS.sid=@sid GROUP BY CS.sid

或者也可以这样做：

SELECT CS.sid,SUM(Courses.price) as sum FROM CS INNER JOIN Courses ON CS.cid=Courses.id AND ON CS.sid=@sid GROUP BY CS.sid

Answer 2

SUM是保留字，您正在尝试选择

SUM(Courses.Price) as Sum...

AS SUM令人窒息。尝试更改为

SUM(Courses.Price) as SumOfCourses

此外，将命名参数与您要比较的列同名可能是一个问题。我总是尝试强制区分以防止任何可能的模糊解释，例如更改

CS.sid= @sid

当我做OleDB时，@ P是“参数”，所以我会有

CS.sid= @Psid

OleDbException（ACCESS）内部联接查询

2 个答案: