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declare column update expression

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In 7.4, how do I declare that a column in a table is to be
automatically set to the value of some fixed expression whenever a row
is updated?

Eg column last_modified is always set to current_timestamp



Chris
--
Chris Velevitch
Manager - Adobe Platform Users Group, Sydney
m: 0415 469 095
www.apugs.org.au

Adobe Platform Users Group, Sydney
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