Conversion failed when converting the varchar value

Dear Experts

select TKN_Dziennik from cdn.TKNag where TKN_Dziennik is not null union
select TrN_Dziennik from cdn.TraNag where TrN_Dziennik is not null union
select TrN_WsDziennik from cdn.TraNag where TrN_WsDziennik 

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I got error in Sql Srv "Conversion failed when converting the varchar value 'ZK' to data type tinyint."
what should I do wrong?
do I need to use cast/convert in every line?

Who is Participating?
Vitor MontalvãoConnect With a Mentor MSSQL Senior EngineerCommented:
You are UNION 3 columns and as result they should have the same datatype. Find which of the columns is TINYINT (TKN_Dziennik, TrN_Dziennik, TrN_WsDziennik) and apply a CAST function on it (CAST ColName AS VARCHAR)
Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
Since I don't see a CAST( as int) in here, then likely one or more of these objects is a view or table-valued function that has a CAST( as int) in it, and is failing there.
ja-rekAuthor Commented:
thanks for help!
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