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Message Posted: Mon, 30 May 2011 @ 15:26:48 GMT
Thanks for the thought but your command sets the comment to a '?', not NULL.
Running your command and then the following query finds no rows (i.e. the comment has not been set to null):
sel * from dbc.tables where databasename = 'workdb' and tablename = 't1' and commentstring is null;
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