>>>>> "Silver" == Silver CHEN <silver@stripped> writes:
Silver> Dear Sir:
Silver> I have a question on the index of mysql.
Silver> If I created an index on some 'date type' column ('0000-00-00'),
Silver> what will happen if I use year(date_column) to make a qeury?
Silver> (ex. select count(*) from tbl where year(date_column) > 1977)
Silver> It seems that mysql will not use that index, right?
Silver> If so, how should I do to let mysql use that index?
SELECT * from table where column >= "1998-01-01")
Silver> And on the other hand, can I use 'part of' the date type column
Silver> to create an index as what the manual said on CHAR types?
This will not work on a DATE column.
Silver> Or it is just rediculus?
Silver> Thanks for your reply!