T-SQL Parameters

Question

I have the following table in SQL Server 2000:

TABLE_NAME         |     COLUMN_NAME      |     TYPE_NAME      |    PRECISION    |    LENGTH  |    SCALE        |
test                     TestID                 int                 10                   4            0
test                     TestDecimal            decimal             18                   20           2
test                     TestFloat              float               15                   8            NULL
test                     TestMoney              money                19                   21            4

My question is, if I wanted to created a stored procedure that takes 4 parameters based on my table fields, how do I do this. I have this solution:

CREATE PROCEDURE TestProc ( @TestID int, @TestDecimal decimal, @TestFloat float, @TestMoney money ) 
AS
.....
.....
.....
GO

This works, except I think @TestDecimal loses its decimal portion, thus converting it into a whole number. Do I need to put @TestDecimal decimal(Precision,Scale) instead of just decimal? and if so, is there any other numeric datatypes that I need to specify this type of parameter encoding?

Answer 1

Yes, you need to specifc (18,2) for decimal/numeric

The same applies to float/real, (n)varchar, (n)char, (var)binary, datetime2 (missed any?)

A different precision, scale or length is in effect a different datatype and a conversion will occur.

Example question of why differenmt varchar lengths make different datatypes

Answer 2

Your parameter type must match the database column type. A database type is defined not only by its base type, but also by its actual length and precision, when it applies. TestDecimal id actualy DECIMAL(18,2) in your example.