I want to edit some row values once I get a query output in the result grid.
Its true that we can right click the table and say open table to get an editable table output, b
If you need to frequently perform in-cell edits on SQL databases, HeidiSQL works a treat, couldn't be simpler to use, and is free / open source (donations accepted).
Originally written for MySQL, it can now handle SQL Server, and has experimental (as of Aug 2014) PostgreSQL support as well.