SQL 2008 user defined function not recognized - sql

Question

This is my first attempt at a user defined function so I am having some issues identifying what I am doing incorrectly. My goal is to create a function that will accept a part id as a paramater and then processes a series of if conditions that analyze the second character in the ID to determine product type based on standard naming conventions. I have made a few tweaks in the script, I have ran each version in master as well as the database. I have not received any failure errors when creating the function however each attempt at using it results in the following error. 'get_product_type' is not a recognized built-in function name.
Current version of this function is bellow.
create function get_product_type (#part nvarchar(30))
returns nvarchar(30)
with execute as caller
as
begin
DECLARE #product nvarchar(30);
if SUBSTRING(#part,1,1) = 'A'
set #product = 'ELLIPTICAL';
else if SUBSTRING(#part,1,1) = 'B'
set #product = 'F&D SPHERICAL';
else if SUBSTRING(#part,1,1) = 'C'
set #product = 'F&D SPHERICAL';
else if SUBSTRING(#part,1,1) = 'D'
set #product = 'HEMISPHERICAL';
else if SUBSTRING(#part,1,1) = 'E'
set #product = 'CONICAL';
else if SUBSTRING(#part,1,1) = 'F'
set #product = 'FLANGED ONLY';
else if SUBSTRING(#part,1,1) = 'G'
set #product = 'DISHED ONLY';
else if SUBSTRING(#part,1,1) = 'H'
set #product = 'TULIP BOWL';
else if SUBSTRING(#part,1,1) = 'I'
set #product = 'TESTING/COUPONS/CHARPIES';
else if SUBSTRING(#part,1,1) = 'J'
set #product = 'FLARED/DISHED';
else if SUBSTRING(#part,1,1) = 'K'
set #product = 'HEAD BRACES';
else if SUBSTRING(#part,1,1) = 'L'
set #product = 'MISCELLANEOUS';
else if SUBSTRING(#part,1,1) = 'M'
set #product = 'HEAD PAD EXTENSIONS';
else if SUBSTRING(#part,1,1) = 'N'
set #product = 'HEAD PADS';
else if SUBSTRING(#part,1,1) = 'O'
set #product = 'MISCELLANEOUS';
else if SUBSTRING(#part,1,1) = 'P'
set #product = 'HUBS';
else if SUBSTRING(#part,1,1) = 'Q'
set #product = 'FLANGED/FLUED';
else if SUBSTRING(#part,1,1) = 'R'
set #product = 'FLUED/PLATE';
else if SUBSTRING(#part,1,1) = 'S'
set #product = 'SILL PAD';
else if SUBSTRING(#part,1,1) = 'T'
set #product = 'TOOLING';
else if SUBSTRING(#part,1,1) = 'U'
set #product = 'CYLENDAR REPAD';
else if SUBSTRING(#part,1,1) = 'V'
set #product = 'ROLLING CANS';
else if SUBSTRING(#part,1,1) = 'W'
set #product = 'HEAT TREAT';
else if SUBSTRING(#part,1,1) = 'X'
set #product = 'SPHERE';
else if SUBSTRING(#part,1,1) = 'Y'
set #product = 'BLASTING';
else if SUBSTRING(#part,1,1) = 'Z'
set #product = 'MISCELLANEOUS';
else set #product = 'MISCELLANEOUS';
return #product
end
If the issue is in how I have been trying to call the function, all of my attempst have been,
get_product_type(cl.PART_ID),
If anyone can provide a push in the right direction it will be greatly appreciated.
Thanks everyone.

Answer 1

I wouldn't do it like this -- it is very slow and you can use SQL to make this process fast using a left join
First define a table with two columns, a one character code and a description
It would look something like this
CREATE TABLE LOOKUP (
CODE CHAR(1),
DESC VARCHAR(100)
)
Make the CODE field the primary key.
Then you can "call" your function like this:
SELECT
COALESCE(LOOKUP.DESC,'MISCELLANEOUS') AS DESC
FROM TABLENAMEHERE
LEFT JOIN LOOKUP ON LOOKUP.CODE = SUBSTRING(TABLENAMEHERE.PRODUCTCODE,1,1)