SQL CAST CHAR AS INTEGER

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Hi All

I have a table with a column that is a CHAR(10) which is used to hold a 'reference'.
If a record is created automatically by the system then the reference is pre-defined and is always an integer but there are manually (user) created records which can have any value in them.
I need to JOIN on this column but only when it contains an integer...

Sounds easy but I cannot seem to get it to work.

The closest I got was

CAST( CASE WHEN ISNUMERIC(Ref_Column) = 1 THEN Ref_Column ELSE 0 END as INT)

However ISNUMERIC allows currency symbols so it fails when the Ref_Column contains something like '£123.45 ' with the error

SQL

Conversion failed when converting the varchar value '£123.45  ' to data type int.

Anyone got any slick solutions for this?

SQL 2008 so no PARSE option...

Thanks

Posted 15-Sep-15 23:37pm

dnibbo

Updated 15-Sep-15 23:40pm

v3

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Tomas Takac · Accepted Answer · 2015-09-15T23:51:00

Solution 1

What about first converting it to money?

SQL

declare @value  varchar(100) = '$125'
select case when isnumeric(@value) = 1 then cast(cast(@value as money) as int) else 0 end

Posted 15-Sep-15 23:51pm

Tomas Takac

Comments

[no name] 16-Sep-15 6:44am

Nice, a 5.

dnibbo 16-Sep-15 7:50am

Thanks very much Tomas, works perfectly.