SQL Convert statement

Question

I need help with a SQL convert statement. I have NetQuanity (masterTable) which is a varchar(15) and I have another table with Purchase price (PO TABLE) which is money. When I try to multiply them in a SQL view is gives me the error:

Answer 1

If your field is a VARCHAR, you'll need to CAST to the appropriate data type prior to your operation. eg

CAST(myVarCharField as INT) * myIntField

Be forewarned however, if you attempt to CAST this field to a numeric data type and it's not numeric, you'll be in the same boat.

I would recommend using CAST over CONVERT in your example, for the following reason defined in this SO post:

Related: T-SQL Cast versus Convert

Answer 2

Maybe try using the CONVERT function? CONVERT(money,NetQuantity) .

Answer 3

First of all you have a data definition problem. The first thing is to eliminate any non-numeric entries in the master table.

SELECT whatever FROM masterTable WHERE ISNUMERIC(NetQuanity)=1

The next step is to include this as a sub-query in the calculation.
In this query use CONVERT or CAST to convert the valid quanities to integer. ie

CONVERT(INT, NetQuantity)