mysql select latest by date for all with same name
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0
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I have a table with points by users:
id, created_at, user_id, points
1, 2018-11-01, 1, 20
2, 2018-11-03, 1, 12
3, 2018-11-04, 2, 15
...
I now want to select the top 50 users, but only considering the users latest points. i.e. user 1 has two entries and only the latest one (2018-11-03) should count.
expected result:
id, created_at, user_id, points
3, 2018-11-04, 2, 15
2, 2018-11-03, 1, 12
...
mysql
asked Nov 20 at 10:58
Chris
2,29521646
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up vote
0
down vote
favorite
I have a table with points by users:
id, created_at, user_id, points
1, 2018-11-01, 1, 20
2, 2018-11-03, 1, 12
3, 2018-11-04, 2, 15
...
I now want to select the top 50 users, but only considering the users latest points. i.e. user 1 has two entries and only the latest one (2018-11-03) should count.
expected result:
id, created_at, user_id, points
3, 2018-11-04, 2, 15
2, 2018-11-03, 1, 12
...
mysql
asked Nov 20 at 10:58
Chris
2,29521646
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I have a table with points by users:
id, created_at, user_id, points
1, 2018-11-01, 1, 20
2, 2018-11-03, 1, 12
3, 2018-11-04, 2, 15
...
I now want to select the top 50 users, but only considering the users latest points. i.e. user 1 has two entries and only the latest one (2018-11-03) should count.
expected result:
id, created_at, user_id, points
3, 2018-11-04, 2, 15
2, 2018-11-03, 1, 12
...
mysql
asked Nov 20 at 10:58
Chris
2,29521646
I have a table with points by users:
id, created_at, user_id, points
1, 2018-11-01, 1, 20
2, 2018-11-03, 1, 12
3, 2018-11-04, 2, 15
...
I now want to select the top 50 users, but only considering the users latest points. i.e. user 1 has two entries and only the latest one (2018-11-03) should count.
expected result:
id, created_at, user_id, points
3, 2018-11-04, 2, 15
2, 2018-11-03, 1, 12
...
mysql
mysql
asked Nov 20 at 10:58
Chris
2,29521646
asked Nov 20 at 10:58
Chris
2,29521646
asked Nov 20 at 10:58
Chris
2,29521646
asked Nov 20 at 10:58
Chris
2,29521646
asked Nov 20 at 10:58
Chris
2,29521646
2,29521646
add a comment |
add a comment |
2 Answers
2
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oldest
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up vote
1
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In a Derived Table, you can the maximum values of created_at (latest created_at) for every user_id. You can then join this result-set to the main table, to get only the row corresponding to latest created_at.
Now, use this result-set to sort on the points in Descending order and consider Top 50 only, using LIMIT 50
SELECT t.*
FROM your_table AS t
JOIN
( SELECT
user_id, MAX(created_at) AS latest_created_at
FROM your_table
GROUP BY user_id
) AS dt
ON dt.user_id = t.user_id AND
dt.latest_created_at = t.created_at
ORDER by t.points DESC
LIMIT 50
answered Nov 20 at 11:06
Madhur Bhaiya
19.3k62236
add a comment |
up vote
0
down vote
You can try using correlated subquery
select * from tablename a
where created_at in
(select max(created_at) from tablename b where a.user_id=b.user_id)
order by points desc limit 50
answered Nov 20 at 11:01
fa06
10.2k1917
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
1
down vote
In a Derived Table, you can the maximum values of created_at (latest created_at) for every user_id. You can then join this result-set to the main table, to get only the row corresponding to latest created_at.
Now, use this result-set to sort on the points in Descending order and consider Top 50 only, using LIMIT 50
SELECT t.*
FROM your_table AS t
JOIN
( SELECT
user_id, MAX(created_at) AS latest_created_at
FROM your_table
GROUP BY user_id
) AS dt
ON dt.user_id = t.user_id AND
dt.latest_created_at = t.created_at
ORDER by t.points DESC
LIMIT 50
answered Nov 20 at 11:06
Madhur Bhaiya
19.3k62236
add a comment |
up vote
1
down vote
In a Derived Table, you can the maximum values of created_at (latest created_at) for every user_id. You can then join this result-set to the main table, to get only the row corresponding to latest created_at.
Now, use this result-set to sort on the points in Descending order and consider Top 50 only, using LIMIT 50
SELECT t.*
FROM your_table AS t
JOIN
( SELECT
user_id, MAX(created_at) AS latest_created_at
FROM your_table
GROUP BY user_id
) AS dt
ON dt.user_id = t.user_id AND
dt.latest_created_at = t.created_at
ORDER by t.points DESC
LIMIT 50
answered Nov 20 at 11:06
Madhur Bhaiya
19.3k62236
add a comment |
up vote
1
down vote
up vote
1
down vote
In a Derived Table, you can the maximum values of created_at (latest created_at) for every user_id. You can then join this result-set to the main table, to get only the row corresponding to latest created_at.
Now, use this result-set to sort on the points in Descending order and consider Top 50 only, using LIMIT 50
SELECT t.*
FROM your_table AS t
JOIN
( SELECT
user_id, MAX(created_at) AS latest_created_at
FROM your_table
GROUP BY user_id
) AS dt
ON dt.user_id = t.user_id AND
dt.latest_created_at = t.created_at
ORDER by t.points DESC
LIMIT 50
answered Nov 20 at 11:06
Madhur Bhaiya
19.3k62236
In a Derived Table, you can the maximum values of created_at (latest created_at) for every user_id. You can then join this result-set to the main table, to get only the row corresponding to latest created_at.
Now, use this result-set to sort on the points in Descending order and consider Top 50 only, using LIMIT 50
SELECT t.*
FROM your_table AS t
JOIN
( SELECT
user_id, MAX(created_at) AS latest_created_at
FROM your_table
GROUP BY user_id
) AS dt
ON dt.user_id = t.user_id AND
dt.latest_created_at = t.created_at
ORDER by t.points DESC
LIMIT 50
answered Nov 20 at 11:06
Madhur Bhaiya
19.3k62236
answered Nov 20 at 11:06
Madhur Bhaiya
19.3k62236
answered Nov 20 at 11:06
Madhur Bhaiya
19.3k62236
answered Nov 20 at 11:06
Madhur Bhaiya
19.3k62236
19.3k62236
add a comment |
add a comment |
up vote
0
down vote
You can try using correlated subquery
select * from tablename a
where created_at in
(select max(created_at) from tablename b where a.user_id=b.user_id)
order by points desc limit 50
answered Nov 20 at 11:01
fa06
10.2k1917
add a comment |
up vote
0
down vote
You can try using correlated subquery
select * from tablename a
where created_at in
(select max(created_at) from tablename b where a.user_id=b.user_id)
order by points desc limit 50
answered Nov 20 at 11:01
fa06
10.2k1917
add a comment |
up vote
0
down vote
up vote
0
down vote
You can try using correlated subquery
select * from tablename a
where created_at in
(select max(created_at) from tablename b where a.user_id=b.user_id)
order by points desc limit 50
answered Nov 20 at 11:01
fa06
10.2k1917
You can try using correlated subquery
select * from tablename a
where created_at in
(select max(created_at) from tablename b where a.user_id=b.user_id)
order by points desc limit 50
answered Nov 20 at 11:01
fa06
10.2k1917
edited Nov 20 at 11:10
answered Nov 20 at 11:01
fa06
10.2k1917
answered Nov 20 at 11:01
fa06
10.2k1917
answered Nov 20 at 11:01
fa06
10.2k1917
10.2k1917
add a comment |
add a comment |
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