>Hi Ed,
>I know that I could always have your advice; thank you for that....
>Well I dont know it´s correct so I think a Sharecourse is a free course about something, this case SQL.

I'm not aware of any; what SQL platform (IOW, are you looking to learn to use the backend for SQL Server, or Oracle, or VFP's native SQL commands for use in VFP applications? They all differ.)

>Is due to that I have to make a SQL course, but the books (in my opinion) are very theoretical, and the sutudent sometimes needs more exercise than theory.

Again, what platform are you talking about - the SQL commands have to run on something! What's the context and required content of the course?

You might want to look at the Study Guide Materials used by Microsoft's SQL Server Certification exams, especially if the target platform is SQL Server.

>I get some information, it´s incomplete, because there isn´ any material about the triggers, you know what it is...?, How it work...? some samples, etc....

Triggers are things that run 'automatically' when an event occurs in the database - in VFP native .DBCs, the things that can fire a trigger are Adding, Deleting and Updating a record, which trigger the Insert, Delete and Update triggers assigned to the table respectively. Triggers can be used to do any number of things, like enforce referential integrity rules, perform overall record validation and the like. Triggers return a logical condition to indicate whether or not the operation should be permitted.

I doubt you're going to find free, detailed, course material; there are any number of people producing computer based training and video tapes for various SQL environments, but they aren't free (or cheap!)