IsNumeric in

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Sometimes the solution to a weird ‘looking’ problem lies in simple SQL Server functions!

I was recently analyzing data of a SQL Server table with a varchar column that contained both numbers and alphabets. The client however now wanted to filter out the rows that contained only numbers in them. Here’s how the requirement was solved

DECLARE @TT table
(
ProductID int,
CodeIdentification varchar
)

-- Create Sample Data
INSERT INTO @TT VALUES ( 101, 'A2')
INSERT INTO @TT VALUES ( 203, '2');
INSERT INTO @TT VALUES ( 305, '2');
INSERT INTO @TT VALUES ( 403, '3');
INSERT INTO @TT VALUES ( 553, 'B3');
INSERT INTO @TT VALUES ( 634, '3');
INSERT INTO @TT VALUES ( 744, '3');
INSERT INTO @TT VALUES ( 838, '4');
SELECT * FROM @TT WHERE IsNumeric(CodeIdentification) = 1

The IsNumeric function determines if the expression passed to it is valid, by returning 1; else it returns 0

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