MySQL Query Browser:
Official GUI tool to query MySQL database

MySQL Query Browser is a visual database query tool with a syntax
highlighting SQL editor. The result tables of may be edited
before changes are committed to the database.

License :
GNU General Public License (GPL)

Copyright :
by MySQL AB.

Install for Debian / Ubuntu system:
sudo apt-get install mysql-query-browser

Screenshot-1 : Select Query

Screenshot-2 : SQL Help