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changing date format to compare dates on the fly in mysql query

Posted on 2009-07-08
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Last Modified: 2012-05-07
I have a database where the dates are in mm.dd.yy format. I need to compare dates to other dates that are in the same format. All I need to know is if one date comes before the other. How can I compare them using a query when they are in this format?
I want to do
 
select * from table where date > date2

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Question by:MeridianManagement
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Expert Comment

by:Kevin Cross
ID: 24804912
Are the fields actually stored as date data type:
http://dev.mysql.com/doc/refman/5.0/en/date-and-time-types.html

Or is this a character field that stores a date?
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by:MeridianManagement
ID: 24804937
no, they're stored as varchar in "mm.dd.yy" format. So, "07.01.09" is an example of July 1st 2009. Otherwise I wouldn't even need to ask this question to compare dates as it would be very simple.
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Expert Comment

by:Kevin Cross
ID: 24804942
If it is string, you can try using STR_TO_DATE function on both dates and then the comparison as you have codes will work just fine.
http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_str-to-date
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Accepted Solution

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Kevin Cross earned 2000 total points
ID: 24804974
Example usage:
SELECT * 
FROM table 
WHERE STR_TO_DATE(date, "%m.%d.%y") > STR_TO_DATE(date2, "%m.%d.%y");

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Author Closing Comment

by:MeridianManagement
ID: 31601173
beautiful, thank you, worked like a charm!
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