on 2011 Jan 14 2:25 PM
According to the docs - and as discussed here - , an ALTER TABLE that changes the datatype of a column will enforce a re-calculation of all computed columns of that table.
I would usually try to put several modifications like changing several columns in one single ALTER TABLE statement.
What implications does that have for the re-calculation:
(In my current case, the re-calculation won't change the contents, and as such it's merely a question of performance; however, in other circumstances it might matter more...)
Request clarification before answering.
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