A trigger is a stored program that is attached to a database.

More Questions from SQL for Database Construction

• SQL Server does not support the BEFORE trigger.
• A stored procedure is a program that performs some common action on database data and is stored in the database.
• The SQL CHECK constraint is fully defined by the SQL-92 standard, and is consistently implemented by all DBMS vendors.
• Three types of triggers are: BEFORE, AFTER and EXCEPTION.
• A updatable view has its own data.
• The SQL statement used to create a view is CREATE VIEW.
• Standard SQL-92 views are constructed from SQL SELECT statements that do not contain the GROUP BY clause.
• When a foreign key column is created without a corresponding foreign key constraint, we have created a "casual relationship" between the two tables.
• The SQL MAKE TABLE command is used to construct tables, define columns, define column constraints and create relationships.
• A SQL view is a virtual table that is constructed from other tables or views.

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