mySQL query with date range and selecting only the most recent records for each ID
I have the following table:
Record ID Status Date Timestamp
----------------------------------------------------------
1 1 waiting 2010-02-02 2010-02-02 12:00:00
2 1 finished 2010-02-02 2010-02-02 12:30:00
3 2 waiting 2009-02-02 2009-02-02 12:00:00
I want to get the records where Date is between 2010-01-01 and 2010-03-03. (this should give me Records 1 and 2)
Further I want to get only the latest (having most recent timestamp) for each ID. (this should give me Record 2 only).
I am not sure how I need to structure my query. I have managed to build the following query:
SELECT `Record` `ID`, MAX( `Timestamp` )
FROM `myTable`
WHERE `Date`
BETWEEN '2010-01-01'
AND '2011-03-03'
GROUP BY `ID`
The problem with the above query is that for some reason it is giving me the following result:
Record ID Timestamp
---------------------------------
1 1 2010-02-02 12:30:00
which is correct except that the Record field should h开发者_C百科ave the value 2 and not 1.
SELECT t1.*
FROM `myTable` t1
INNER JOIN
(
SELECT MAX(`Timestamp`) as Timestamp
FROM `myTable`
WHERE `Date`
BETWEEN '2010-01-01'
AND '2011-03-03'
GROUP BY `ID`
) t2
ON t1.Timestamp = t2.Timestamp
Try the below query
SELECT `Record` `ID`,Timestamp
FROM `myTable`
WHERE `Date`
BETWEEN '2010-01-01'
AND '2011-03-03'
Order by `Timestamp` desc
limit 1
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