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varchar to int conversion

Posted By:      Posted Date: October 27, 2010    Points: 0   Category :Sql Server
Hi All,

I have a column in table of type varchar(255). I need to insert data from this table into another table and the column type at the destination is int. I used the following SQL but it says ColumnName 

Conversion failed when converting the varchar value '212' to data type int.

SELECT  CASE WHEN ColumnName in ('na', ') THEN '0' ELSE CAST(ColumnName AS INT) END 
FROM Table

I have the value 212 in my column why is it having trouble converting it? Please advise, thanks in advance.

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