wat is mean by trigger?.......normally wat use......when trigger used in sql...

wat is mean by trigger?.......normally wat use......when
trigger used in sql...........
plz cleary say with example.......

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wat is mean by trigger?.......normally wat use......when trigger used in sql........... plz cleary..

Answer / vimal p.s

A trigger is a SQL procedure that initiates an action when
an event (INSERT, DELETE or UPDATE) occurs. Triggers are
stored in and managed by the DBMS.Triggers are used to
maintain the referential integrity of data by changing the
data in a systematic fashion. A trigger cannot be called or
executed; the DBMS automatically fires the trigger as a
result of a data modification to the associated table.
Triggers can be viewed as similar to stored procedures in
that both consist of procedural logic that is stored at the
database level. Stored procedures, however, are not event-
drive and are not attached to a specific table as triggers
are. Stored procedures are explicitly executed by invoking
a CALL to the procedure while triggers are implicitly
executed. In addition, triggers can also execute stored
procedures.

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wat is mean by trigger?.......normally wat use......when trigger used in sql........... plz cleary..

Answer / radhakrishnan vaithilingam

Def Trigger : bascially trigger means "activate or generate
or fire".if we touch any column automaticcaly some event
accure in database.
use :
1) if update or insert or delete more than one table we can
use this concept.
2) trigger reduce coding error and reduce wrong action
3) we can trace the system login or logoff inforamtion.
this is system trigger.

example :
1) bank account
if we retrive the money from ATM. the money automatically
reduced from your account immediate.
2) fire alarm

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