By interchanging the given two signs which of the

Which SQL constraint ensures a column cannot have NULL values?

What is the main function of a PL/SQL `TRIGGER`?

Which SQL function returns the largest value in a column?

Which PL/SQL cursor attribute returns `TRUE` if the most recent `FETCH` statement returned a row, and `FALSE` otherwise?

Which of the following is a common use case for a PL/SQL trigger?

Which SQL command is used to modify existing records in a table?

Materialized views differ from normal views because:

Which SQL constraint ensures that a column’s values are unique across the table?

A `BEFORE INSERT` trigger fires:

Which SQL function is used to calculate the average of a numeric column?