Firebird 2.1 Language Reference Update

CREATE OR ALTER TRIGGER
Available in: DSQL
Added in: 1.5
DDL statements
Description: If the trigger does not yet exist, it is created just as if CREATE TRIGGER were used. If it already
exists, it is altered and recompiled. Existing permissions and dependencies are preserved.
Syntax: Exactly the same as for CREATE TRIGGER.
DROP TRIGGER
Available in: DSQL, ESQL
Restriction on dropping used triggers
Changed in: 2.0, 2.0.1
Description: In Firebird 2.0 only, a restriction is in place which prevents anyone from dropping, altering or
recreating a trigger or stored procedure if it has been used since the database was opened. This restriction has
been removed again in version 2.0.1. Still, performing these operations on a live database is potentially risky
and should only be done with the utmost care.
DROP TRIGGER no longer increments table change count
Changed in: 1.0
Description: In contrast to InterBase, Firebird does not increment the metadata change counter of the associated
table when CREATE, ALTER or DROP TRIGGER is used. For a full discussion, see ALTER TRIGGER no longer
increments table change count.
RECREATE TRIGGER
Available in: DSQL
Added in: 2.0
Description: Creates or recreates a trigger. If a trigger with the same name already exists, RECREATE TRIGGER
will try to drop it and create a new trigger. RECREATE TRIGGER will fail if the existing trigger is in use.
Syntax: Exactly the same as CREATE TRIGGER.
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