Solved

Convert from varchar to decimal

Posted on 2003-10-21
3
1,342 Views
Last Modified: 2012-05-04

hi all

i have a field which is stored as a varchar(30). I need it as varchar as the value can be characters or numbers etc.

in some case i  need to add two of these fields when the text value are deciamls e.g. '.75' to do this i need to change them to decimals first. i have tried Cast('0.75' as DECIMAL(28,9)) but it gives me 1.00000000. it seems to be rounding to the nearest whole number. can anyone help?
0
Comment
Question by:Cause
3 Comments
 
LVL 4

Accepted Solution

by:
Greg Rowland earned 100 total points
ID: 9591768
declare @aNumber DECIMAL(28,9)

set @aNumber =  Cast('0.759' as DECIMAL(28,9))

SELECT @aNumber
0
 
LVL 19

Expert Comment

by:Dexstar
ID: 9591795
What SurferJoe posted should work.  You shouldn't issue Cast('0.75' as DECIMAL(28,9)) and get 1.000000 unless there is some other conversion going on.  Post your SELECT statement, and we can help determine that.

But from what you've mentioned, I think you need a more robust solution.  For example, if you have 2 fields in a table, and you want to return the sum of those fields if they are numeric, then try something like this:

SELECT Value = CASE
            WHEN ISNUMERIC(Field1) = 1 THEN CAST(Field1 AS DECIMAL(28,9))
            ELSE 0 END
            +
            CASE WHEN ISNUMERIC(Field2) = 1 THEN CAST(Field2 AS DECIMAL(28,9))
            ELSE 0 END
FROM Table

(Where Field1 and Field2 are your VARCHAR fields and Table is your table)
0
 

Author Comment

by:Cause
ID: 9591868

Thanks SurferJoe that worked!

Thanks as well  Dexstar! i had implemented the other answer before i saw urs :-( as you poined out another field in the statment had an incorrect conversion!

Thanks again
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Why is this different from all of the other step by step guides?  Because I make a living as a DBA and not as a writer and I lived through this experience. Defining the name: When I talk to people they say different names on this subject stuff l…
This article shows gives you an overview on SQL Server 2016 row level security. You will also get to know the usages of row-level-security and how it works
Using examples as well as descriptions, and references to Books Online, show the documentation available for date manipulation functions and by using a select few of these functions, show how date based data can be manipulated with these functions.
This video shows how to set up a shell script to accept a positional parameter when called, pass that to a SQL script, accept the output from the statement back and then manipulate it in the Shell.

679 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question