I have the following table
FIELD_A | FIELD_B | TSTAMP
--------------------------------------------------------------------------------------------------------
x y 2005-03-10
14:56:47.456431
TSTAMP = not null default now()
What's the best way to always auto-update TSTAMP to it's
default value whenever the row gets updated?
(e.g. update TABLENAME set FIELD_A='zzz' where FIELD_A='x';
should automatically set TSTAMP to now)
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