我的SQL代码有什么问题？

Question

I get this error

The specified field 'StockID' could refer to more than one table listed in the FROM clause of your SQL statement.

Code:

 cmd = New OleDbCommand("SELECT StockID as [Stock ID], ea.Products as [Product]," & _
                         "emp.Amount FROM Stock ea inner join tblProductDetails" & _
                         "emp on emp.StockID = ea.StockID", con)

I've set the relationship to tblProductDetails 's stockID to Stock

Sorry for any obvious mistake.

Answer 1

It means that the specified field 'StockID' could refer to more than one table listed in the FROM clause of your SQL statement.

In other words, both Stock and tblProductDetails have a field named StockID , and it isn't sure which one you mean.

You have to qualify it with the table name, eg SELECT ea.StockID or SELECT emp.StockID .

Even though you're joining and they both have the same value, you still have to specify one. In your case, with an inner join, the choice is fairly arbitrary.

Answer 2

both your tables (Stock and tblProductDetails) has a field called [Stock ID]. you will need to specify which one to use (either emp or ea)