On 1 Dec 2003 at 13:41, Kevin Carlson wrote:
Does MySQL support formatted indexes such as in the statement below?
alter table DateInfo add index monthYear (DATE_FORMAT(updateDate,
'%m/%Y'))
What sort of queries would that help you with?...
This helps with queries where you want to get all of the records where a date column value falls within a specific month and year. For example:
select * from DateInfo where DATE_FORMAT(updateDate, '%m/%Y') = '03/2003'
I have an index on the updateDate column but it does not seem to be used since I am altering the value with the DATE_FORMAT function in the where clause. Using 'explain' it becomes obvious that no index is being used to build the result set.
I hope that makes things more clear. Any ideas?
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