Difference between before and after trigger

    Is there any difference between these two trigger .
    If its there , then please tell when we should use before trigger and after trigger
   thanx
   young bro

BEFORE Triggers
BEFORE triggers run the trigger action before the triggering statement is run. This type of trigger is commonly used in the following situations:
When the trigger action determines whether the triggering statement should be allowed to complete. Using a BEFORE trigger for this purpose, you can eliminate unnecessary processing of the triggering statement and its eventual rollback in cases where an exception is raised in the trigger action.
To derive specific column values before completing a triggering INSERT or UPDATE statement.
AFTER Triggers
AFTER triggers run the trigger action after the triggering statement is run.
Trigger Type Combinations
Using the options listed previously, you can create four types of row and statement triggers:
BEFORE statement trigger
Before executing the triggering statement, the trigger action is run.
BEFORE row trigger
Before modifying each row affected by the triggering statement and before checking appropriate integrity constraints, the trigger action is run, if the trigger restriction was not violated.
AFTER statement trigger
After executing the triggering statement and applying any deferred integrity constraints, the trigger action is run.
AFTER row trigger
After modifying each row affected by the triggering statement and possibly applying appropriate integrity constraints, the trigger action is run for the current row provided the trigger restriction was not violated. Unlike BEFORE row triggers, AFTER row triggers lock rows.
You can have multiple triggers of the same type for the same statement for any given table. For example, you can have two BEFORE statement triggers for UPDATE statements on the employees table. Multiple triggers of the same type permit modular installation of applications that have triggers on the same tables. Also, Oracle materialized view logs use AFTER row triggers, so you can design your own AFTER row trigger in addition to the Oracle-defined AFTER row trigger.
You can create as many triggers of the preceding different types as you need for each type of DML statement, (INSERT, UPDATE, or DELETE).
S

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http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14251/adfns_triggers.htm#sthref1175

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Welcome to our community
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Hi all,
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Edited by: cycon on Nov 8, 2010 9:00 AM

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Thanks

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Girish,
I wont say that I am correcting you as this is like that half glass full/empty thing.May be what I see is half empty , you would see the same as half full.
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The point 3 totally knocked me out.I have no idea what you said.
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Thanks!
Regards,
Madhur

Hi
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You can use this function for document types Shopping cart, (Local) Purchase Order, Confirmation, and Invoice to trigger a synchronization with the associated documents in the back-end system. The system checks whether and how the (follow-on) documents were posted in the back end, and updates the object link and references, as well as the document status.
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Genie,
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The way ledger is built is around a business area ,company or country and is very tighly designed in SAP. I would like to know if there is any equivalent of the configuration items in ORACLE. I am more interested in terminology of ORACLE.
For example ,
SAP ====> ORACLE
GL ==> Book In ORACLE
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difference between open_form and start_form?

hi,
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Regards
Kiran Sure

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