Re: Group by clause

I Suspect the data 'TECH111' . Are you sure there is no space in both sides of the text? Re check the data once. And , if still issue persist , delete the records 'A1113' ( 2 rows) and re insert it. Then have a try ( all these steps just because i doubt the data )

Execute the below and check it.

select COL1 , LENGTH(COL1) from <.......>;

Sree