Tool for convert SQL code to diagram

can any one say some way to convert SQL code to data diagram like ERD ? for som DBMS like MySQL or general SQL

Answer

For MySQL can use sqlyog :

SQLyog MySQL GUI is the most powerful
MySQL manager and admin tool,
combining the features of MySQL Query
Browser, Administrator, phpMyAdmin and
other MySQL Front Ends and MySQL GUI
tools in a single intuitive interface.

http://www.webyog.com/en/