SQL statements and some more
dear all,
am trying to do the following but am new to NSIS, so if any body can help me.

1. I wannt to alter tabels and create tables and do some SQL statements, am already includes the SQL.nsh also i toke the bcp.exe, osql.exe, bcp.rll from some installer made before.

2. i want simple example on how to use ( IfFileExists ) function (i want to check if this file exisit do this section if not go to next section.

3. how to change a permissions for some folder

4. how to make the next button go to custom page!?