In SQL, which command(s) is(are) used to enable/disable a database trigger?

In SQL, which command(s) is(are) used to enable/disable a database trigger?

If the record management system allows you to edit values before they are record

If the record management system allows you to edit values before they are recorded on disk, you can

The relational model uses some unfamiliar terminology. A tuple is equivalent to

The relational model uses some unfamiliar terminology. A tuple is equivalent to a:

The files stored on a secondary stage device are composed of a hierarchy of data

The files stored on a secondary stage device are composed of a hierarchy of data. What does a record in a file contain?