I want to get last record of each day in mysql. Location<id, date, place_id>
table has multiple entries on each day. This Location table has place_id and time at which place_id is inserted.
Also taking consider if place_id is not present then return second last record which has place_id. In following table for NULL, '2016-04-06 18:52:06'
record we are returning '13664', '2016-04-06 12:57:30'
, which is second last record on '2016-04-06' (6th March) and has place_id.
One more thing, on single day, there would be more place_id, see the following table..
id || place_id || date
'1', '47', '2016-04-05 18:09:37'
'2', '48', '2016-04-05 12:09:37'
'3', '13664', '2016-04-06 12:57:30'
'4', '9553', '2016-04-08 10:09:37'
'5', NULL, '2016-04-06 18:52:06'
'6', '9537', '2016-04-07 03:34:24'
'7', '9537', '2016-04-07 03:34:24'
'8', '656', '2016-04-07 05:34:24'
'9', '7', '2016-04-07 05:34:57'
When I run following query it returns following result
Query I run the following query but it is giving me wrong result
`Location<id, place_id, date>`
select L1.place_id, L1.date from
Location1 L1
Left join
Location1 L2
on
Date(L1.date) = Date(L2.date)
And
L1.date < L2.date
where
L2.date is null
group by L1.date;
Result I want:
id....place_id ........date
'1', '47', '2016-04-05 18:09:37'
'3', '13664', '2016-04-06 12:57:30'
'4', '9553', '2016-04-08 10:09:37'
'9', '7', '2016-04-07 05:34:57'
You may give it a try:
SELECT
L.id,
L.place_id,
L.date
FROM Location L
INNER JOIN
(
SELECT
MAX(date) max_time
FROM Location
GROUP BY Date(`date`)
) AS t
ON L.date = t.max_time
[ Based on your expected output ]
Can you try with the following query:
SELECT * FROM `Location` GROUP BY DATE(`date`) ORDER BY `date` DESC
What this query does is group the rows by descending date and show a row for each date.
Get the last record:
SELECT * FROM `Location` ORDER BY `date` LIMIT 1;
Get the last record that doesn't have a null as a value:
SELECT * FROM `Location` WHERE place_id IS NOT NULL ORDER BY `date` LIMIT 1;
Get records for all the places which are not null:
SELECT * FROM `Location` WHERE place_id IS NOT NULL GROUP BY `place_id` ORDER BY `date` DESC
Would this work?
select place_id, max(date) as MaxDate
from foo
where place_id is not NULL
group by place_id
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