How to coerce data types to strings in a SELECT statement?

ABAPers,
I need to coerce column outputs to strings in a SELECT statement. Here is a pseudo example:
select ConvertToString(count(*)) from MARA
On help.sap.com, I could not find enough information on the functions that are supported within SELECT statement. I would appreciate it if someone can enlighten me on how to achive this.
Note that my real problem is that I do not know the return type of the specified columns. The columns are passed as a user-specified parameter. As I do not know the column types, I am mandating that customers specify columns that return only string type data.
Thank you in advance for your help.
Pradeep

Hi Pradeep,
Convert to string wont be possible in the SELECT statement.
What you can do is use Field Symbols. This allows to assign data types dynamically.
Field-Symbols
Best regards,
Prashant
Pls. mark points for helpful answers

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<REMOVED BY MODERATOR>
venkat.
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