[Pgsql-ayuda] triggers...if UPDATE(nombre_campo) then....

en los triggers en sybase podes
usar una expresion del tipo:
...if UPDATE(nombre_campo) then....
como ??
podria interpretar esto
en PostgreSQL ???

* * * * * del manual del sybase: * * * * *

CREATE TRIGGER statement [T-SQL]
---------------------------------------------------

Description
Use this statement to create a new trigger in the
database in a manner compatible with Adaptive
Server Enterprise.

Syntax 1
CREATE TRIGGER [owner.]trigger_name
ON [owner.]table_name
FOR { INSERT, UPDATE, DELETE }
AS statement-list

Syntax 2
CREATE TRIGGER [owner.]trigger_name
ON [owner.]table_name
FOR {INSERT, UPDATE}
AS
[ IF UPDATE ( column_name )
[ { AND | OR } UPDATE ( column_name ) ] ... ]
statement-list
[ IF UPDATE ( column_name )
[ { AND | OR} UPDATE ( column_name ) ] ... ]
statement-list

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