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Column level triggers

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Hi,

According to the documentation (
http://www.postgresql.org/docs/8.3/interactive/sql-createtrigger.html
), the feaure "SQL allows triggers to fire on updates to specific
columns (e.g., AFTER UPDATE OF col1, col2)" is missing.
After a bit of research, I found that this feature was in the TODO
list ( http://wiki.postgresql.org/wiki/Todo#Triggers ), and that a
patch was proposed on 2005/07.
Is it going to be implemented soon ? It would greatly help, IMHO, for
load, and simplify the write of plpgsql functions called by before
triggers.
Regards, and keep up the good work, that DBMS (mostly;) rocks !

Laurent

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