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A trigger may be specified to fire whenever a DELETE, INSERT, or UPDATE of a particular database table occurs, or whenever an UPDATE occurs on on one or more specified columns of a table.At this time SQLite supports only FOR EACH ROW triggers, not FOR EACH STATEMENT triggers.An error code of SQLITE_CONSTRAINT is returned to the application, along with the specified error message.When RAISE(IGNORE) is called, the remainder of the current trigger program, the statement that caused the trigger program to execute and any subsequent trigger programs that would have been executed are abandoned. If the statement that caused the trigger program to execute is itself part of a trigger program, then that trigger program resumes execution at the beginning of the next step.
However if an ON CONFLICT clause is specified as part of the statement causing the trigger to fire, then conflict handling policy of the outer statement is used instead.
Triggers are removed using the DROP TRIGGER statement.
The UPDATE, DELETE, and INSERT statements within triggers do not support the full syntax for UPDATE, DELETE, and INSERT statements.
For each row that has an employee id between 79, a new row is inserted with an employee id incremented by 1000.
The following are the results of executing the command when three new rows are inserted.Both the WHEN clause and the trigger actions may access elements of the row being inserted, deleted or updated using references of the form "NEW.column-name" and "OLD.column-name", where column-name is the name of a column from the table that the trigger is associated with.