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MySQL query with substring
Posted on 2014-01-07
What is wrong with this:
SELECT * FROM `citrans` WHERE substring(dtstamp,0,4) = '2012'.
See attached for structure of table citrans.
There are hundreds of records with year = 2012.
citrans-str.jpg
SELECT * FROM `citrans` WHERE substring(dtstamp,0,4) = '2012'.
See attached for structure of table citrans.
There are hundreds of records with year = 2012.
citrans-str.jpg
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3 Comments
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Are you getting an error message? MySQL doesn't keep the DATETIME columns in text format but in an internal binary format. It converts them to text when it returns them.
I wouldn't do it that way. This is what I use.
I wouldn't do it that way. This is what I use.
SELECT * FROM `citrans` WHERE `dtstamp` >= '2012-01-01' AND `dtstamp` < '2013-01-01'
SUBSTRING is for text fields, better to use a date function:
SELECT * FROM citrans WHERE YEAR( dtstamp ) = '2012'
SELECT * FROM citrans WHERE YEAR( dtstamp ) = '2012'
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