While installing SW Electrical we can install SQL with the SW Electrical but also with EPDM  comes SQL installation So to be sure for healthy installation process for both :

1. Which SQL should I install first (or which product should I install first) ?why ?
2. the SQL that comes with the SW Electrical is express , what about the one that comes with EPDM ?
3. can I use the SQL that comes with the SW Electrical to set up EPDM Server ?
4. can I use the SQL that comes with EPDM to set up SW Electrical Server ?

Thank you in advance.