Formatting an SQL numeric query result with an arbitrary number of decimal places

Question

I have a database table with these two columns:

• Amount: numeric (18,0)
• DecimalPlaces: numeric (18,0)

This table can store amounts in va

Answer 1

This is gross but worked for the current inputs on SQL server.

select 
    substring(
     CAST(
      CAST(
        (amount *  power(-0.100000000000000000,decimalPlaces*1.000000000000000000)) as numeric(36,18)
      )as varchar(30)
     )
    ,1,len(cast(amount as varchar(20))) + (CASE WHEN decimalPlaces = 0 THEN 0 ELSE 1 END )) 

from
 myTable