varchar to int conversion


hi all,

i have column in table of type varchar(255). need insert data table table , column type @ destination int. used following sql says columnname 

conversion failed when converting varchar value '212' data type int.

select  case when columnname in ('na', '') '0' else cast(columnname as int) end 
from table

i have value 212 in column why having trouble converting it? please advise, in advance.

there invisible characters in column, numbers ok here.

take @ blog post extract numbers string

extracting numbers sql server

premature optimization root of evil in programming. (c) donald knuth

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SQL Server  >  Transact-SQL



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