How could I execute a set of .SQL files (each does some data transformations) from within SQL Server Management Studio?
What other alternative are there for executing .
While SQLCMD.exe is the best way, SSMS also has a SQLCMD mode where you can execute a SQLCMD script. To enable this mode click Query in menu bar then select SQLCMD Mode.
The ":r filename.sql" command is the SQLCMD script command to import and execute a sql script file. You know you are in SQLCMD mode because any lines that are SQLCMD script commands will appear with colored (gray I think) background.
:setvar path "c:\Path_to_scripts\"
:r $(path)\file1.sql
:r $(path)\file2.sql