SELECT Where ID in (List of IDs) and limit records of each IDs in MySQL
I have a met a situation that I have list of IDs of a Store table and need to fetch latest 10 files from each store.
SELECT *
FROM tblFiles
WHERE storeId in (IDs)
ORDER BY createdDate DESC
LIMIT 10
But, this limits the whole results. I found an answer to similar SO question. But, the answer recommends to use loop for each ID. This results in multiple DB hit.
Another option is to fetch all records and group them in the code. But, this will be heavy if there's large no.of records.
It'll be nice if it can be handled at the query level. Any help will be appreciated.
NB: The tables used here are dummy ones.
mysql sql
edited Dec 31 '18 at 10:17
GMB
11.3k2824
asked Dec 31 '18 at 9:50
AbhishekAbhishek
708827
add a comment |
I have a met a situation that I have list of IDs of a Store table and need to fetch latest 10 files from each store.
SELECT *
FROM tblFiles
WHERE storeId in (IDs)
ORDER BY createdDate DESC
LIMIT 10
But, this limits the whole results. I found an answer to similar SO question. But, the answer recommends to use loop for each ID. This results in multiple DB hit.
Another option is to fetch all records and group them in the code. But, this will be heavy if there's large no.of records.
It'll be nice if it can be handled at the query level. Any help will be appreciated.
NB: The tables used here are dummy ones.
mysql sql
edited Dec 31 '18 at 10:17
GMB
11.3k2824
asked Dec 31 '18 at 9:50
AbhishekAbhishek
708827
What version of mysql are you on?
– P.Salmon
Dec 31 '18 at 9:57
MySQL version 5.6.28
– Abhishek
Dec 31 '18 at 10:04
checkout this stackoverflow.com/questions/53968285/…
– Jacob
Dec 31 '18 at 10:10
add a comment |
I have a met a situation that I have list of IDs of a Store table and need to fetch latest 10 files from each store.
SELECT *
FROM tblFiles
WHERE storeId in (IDs)
ORDER BY createdDate DESC
LIMIT 10
But, this limits the whole results. I found an answer to similar SO question. But, the answer recommends to use loop for each ID. This results in multiple DB hit.
Another option is to fetch all records and group them in the code. But, this will be heavy if there's large no.of records.
It'll be nice if it can be handled at the query level. Any help will be appreciated.
NB: The tables used here are dummy ones.
mysql sql
edited Dec 31 '18 at 10:17
GMB
11.3k2824
asked Dec 31 '18 at 9:50
AbhishekAbhishek
708827
I have a met a situation that I have list of IDs of a Store table and need to fetch latest 10 files from each store.
SELECT *
FROM tblFiles
WHERE storeId in (IDs)
ORDER BY createdDate DESC
LIMIT 10
But, this limits the whole results. I found an answer to similar SO question. But, the answer recommends to use loop for each ID. This results in multiple DB hit.
Another option is to fetch all records and group them in the code. But, this will be heavy if there's large no.of records.
It'll be nice if it can be handled at the query level. Any help will be appreciated.
NB: The tables used here are dummy ones.
mysql sql
mysql sql
edited Dec 31 '18 at 10:17
GMB
11.3k2824
asked Dec 31 '18 at 9:50
AbhishekAbhishek
708827
edited Dec 31 '18 at 10:17
GMB
11.3k2824
asked Dec 31 '18 at 9:50
AbhishekAbhishek
708827
edited Dec 31 '18 at 10:17
GMB
11.3k2824
edited Dec 31 '18 at 10:17
GMB
11.3k2824
edited Dec 31 '18 at 10:17
GMB
11.3k2824
11.3k2824
asked Dec 31 '18 at 9:50
AbhishekAbhishek
708827
asked Dec 31 '18 at 9:50
AbhishekAbhishek
708827
asked Dec 31 '18 at 9:50
AbhishekAbhishek
708827
708827
What version of mysql are you on?
– P.Salmon
Dec 31 '18 at 9:57
MySQL version 5.6.28
– Abhishek
Dec 31 '18 at 10:04
checkout this stackoverflow.com/questions/53968285/…
– Jacob
Dec 31 '18 at 10:10
add a comment |
What version of mysql are you on?
– P.Salmon
Dec 31 '18 at 9:57
MySQL version 5.6.28
– Abhishek
Dec 31 '18 at 10:04
checkout this stackoverflow.com/questions/53968285/…
– Jacob
Dec 31 '18 at 10:10
What version of mysql are you on?
– P.Salmon
Dec 31 '18 at 9:57
What version of mysql are you on?
– P.Salmon
Dec 31 '18 at 9:57
MySQL version 5.6.28
– Abhishek
Dec 31 '18 at 10:04
MySQL version 5.6.28
– Abhishek
Dec 31 '18 at 10:04
checkout this stackoverflow.com/questions/53968285/…
– Jacob
Dec 31 '18 at 10:10
checkout this stackoverflow.com/questions/53968285/…
– Jacob
Dec 31 '18 at 10:10
add a comment |
3 Answers
3
active
oldest
votes
Pre-MySQL 8.0, the simplest method is probably variables:
select f.*
from (select f.*,
(@rn := if(@s = storeId, @rn + 1,
if(@s := storeId, 1, 1)
)
) as rn
from (select f.*
from tblfiles f
where storeId in (IDs)
order by storeId, createdDate desc
) f cross join
(select @s := 0, @rn := 0) params
) f
where rn <= 10;
In MySQL 8+ or MariaDB 10.3+, you would simply use window functions:
select f.*
from (select f.*,
row_number() over (partition by storeid order by createdDate desc) as seqnum
from tblfiles f
) f
where seqnum <= 10;
In older versions of MySQL and MariaDB, the innermost subquery may not be needed.
answered Dec 31 '18 at 11:42
Gordon LinoffGordon Linoff
772k35304406
This one is nice. And I think you have to use rn instead of @rn in the last where clause.
– Abhishek
Jan 1 at 4:36
@Abhishek . . . Yes. That was a typo.
– Gordon Linoff
Jan 1 at 13:51
add a comment |
You could workaround it with an UNIONed query, where each subquery searches for a particular id and enforces a LIMIT clause, like :
(SELECT *
FROM tblFiles
WHERE storeId = ?
ORDER BY createdDate DESC
LIMIT 10)
UNION
(SELECT *
FROM tblFiles
WHERE storeId = ?
ORDER BY createdDate DESC
LIMIT 10)
...
With this solution only one db hit will happen, and you are guarantee to get the LIMIT on a per id basis. Such a SQL can easily be generated from within php code.
Nb : the maximum allowed of UNIONs in a mysql query is 61.
answered Dec 31 '18 at 10:05
GMBGMB
11.3k2824
This one is nice. But, the query becomes a large one if there are more no.of of IDs (storeId) are there in request.
– Abhishek
Dec 31 '18 at 10:08
1
@Abhishek : 61 UNIONs is the max. Query is large but easy to generate dynamically...
– GMB
Dec 31 '18 at 10:09
add a comment |
use select in where
SELECT * from tblFiles where storeId in (SELECT id from store ORDER BY datefield/id field desc limit 10)
answered Dec 31 '18 at 10:14
RamRam
397
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
Pre-MySQL 8.0, the simplest method is probably variables:
select f.*
from (select f.*,
(@rn := if(@s = storeId, @rn + 1,
if(@s := storeId, 1, 1)
)
) as rn
from (select f.*
from tblfiles f
where storeId in (IDs)
order by storeId, createdDate desc
) f cross join
(select @s := 0, @rn := 0) params
) f
where rn <= 10;
In MySQL 8+ or MariaDB 10.3+, you would simply use window functions:
select f.*
from (select f.*,
row_number() over (partition by storeid order by createdDate desc) as seqnum
from tblfiles f
) f
where seqnum <= 10;
In older versions of MySQL and MariaDB, the innermost subquery may not be needed.
answered Dec 31 '18 at 11:42
Gordon LinoffGordon Linoff
772k35304406
This one is nice. And I think you have to use rn instead of @rn in the last where clause.
– Abhishek
Jan 1 at 4:36
@Abhishek . . . Yes. That was a typo.
– Gordon Linoff
Jan 1 at 13:51
add a comment |
Pre-MySQL 8.0, the simplest method is probably variables:
select f.*
from (select f.*,
(@rn := if(@s = storeId, @rn + 1,
if(@s := storeId, 1, 1)
)
) as rn
from (select f.*
from tblfiles f
where storeId in (IDs)
order by storeId, createdDate desc
) f cross join
(select @s := 0, @rn := 0) params
) f
where rn <= 10;
In MySQL 8+ or MariaDB 10.3+, you would simply use window functions:
select f.*
from (select f.*,
row_number() over (partition by storeid order by createdDate desc) as seqnum
from tblfiles f
) f
where seqnum <= 10;
In older versions of MySQL and MariaDB, the innermost subquery may not be needed.
answered Dec 31 '18 at 11:42
Gordon LinoffGordon Linoff
772k35304406
This one is nice. And I think you have to use rn instead of @rn in the last where clause.
– Abhishek
Jan 1 at 4:36
@Abhishek . . . Yes. That was a typo.
– Gordon Linoff
Jan 1 at 13:51
add a comment |
Pre-MySQL 8.0, the simplest method is probably variables:
select f.*
from (select f.*,
(@rn := if(@s = storeId, @rn + 1,
if(@s := storeId, 1, 1)
)
) as rn
from (select f.*
from tblfiles f
where storeId in (IDs)
order by storeId, createdDate desc
) f cross join
(select @s := 0, @rn := 0) params
) f
where rn <= 10;
In MySQL 8+ or MariaDB 10.3+, you would simply use window functions:
select f.*
from (select f.*,
row_number() over (partition by storeid order by createdDate desc) as seqnum
from tblfiles f
) f
where seqnum <= 10;
In older versions of MySQL and MariaDB, the innermost subquery may not be needed.
answered Dec 31 '18 at 11:42
Gordon LinoffGordon Linoff
772k35304406
Pre-MySQL 8.0, the simplest method is probably variables:
select f.*
from (select f.*,
(@rn := if(@s = storeId, @rn + 1,
if(@s := storeId, 1, 1)
)
) as rn
from (select f.*
from tblfiles f
where storeId in (IDs)
order by storeId, createdDate desc
) f cross join
(select @s := 0, @rn := 0) params
) f
where rn <= 10;
In MySQL 8+ or MariaDB 10.3+, you would simply use window functions:
select f.*
from (select f.*,
row_number() over (partition by storeid order by createdDate desc) as seqnum
from tblfiles f
) f
where seqnum <= 10;
In older versions of MySQL and MariaDB, the innermost subquery may not be needed.
answered Dec 31 '18 at 11:42
Gordon LinoffGordon Linoff
772k35304406
edited Jan 1 at 13:51
answered Dec 31 '18 at 11:42
Gordon LinoffGordon Linoff
772k35304406
answered Dec 31 '18 at 11:42
Gordon LinoffGordon Linoff
772k35304406
answered Dec 31 '18 at 11:42
Gordon LinoffGordon Linoff
772k35304406
772k35304406
This one is nice. And I think you have to use rn instead of @rn in the last where clause.
– Abhishek
Jan 1 at 4:36
@Abhishek . . . Yes. That was a typo.
– Gordon Linoff
Jan 1 at 13:51
add a comment |
This one is nice. And I think you have to use rn instead of @rn in the last where clause.
– Abhishek
Jan 1 at 4:36
@Abhishek . . . Yes. That was a typo.
– Gordon Linoff
Jan 1 at 13:51
This one is nice. And I think you have to use rn instead of @rn in the last where clause.
– Abhishek
Jan 1 at 4:36
This one is nice. And I think you have to use rn instead of @rn in the last where clause.
– Abhishek
Jan 1 at 4:36
@Abhishek . . . Yes. That was a typo.
– Gordon Linoff
Jan 1 at 13:51
@Abhishek . . . Yes. That was a typo.
– Gordon Linoff
Jan 1 at 13:51
add a comment |
You could workaround it with an UNIONed query, where each subquery searches for a particular id and enforces a LIMIT clause, like :
(SELECT *
FROM tblFiles
WHERE storeId = ?
ORDER BY createdDate DESC
LIMIT 10)
UNION
(SELECT *
FROM tblFiles
WHERE storeId = ?
ORDER BY createdDate DESC
LIMIT 10)
...
With this solution only one db hit will happen, and you are guarantee to get the LIMIT on a per id basis. Such a SQL can easily be generated from within php code.
Nb : the maximum allowed of UNIONs in a mysql query is 61.
answered Dec 31 '18 at 10:05
GMBGMB
11.3k2824
This one is nice. But, the query becomes a large one if there are more no.of of IDs (storeId) are there in request.
– Abhishek
Dec 31 '18 at 10:08
1
@Abhishek : 61 UNIONs is the max. Query is large but easy to generate dynamically...
– GMB
Dec 31 '18 at 10:09
add a comment |
You could workaround it with an UNIONed query, where each subquery searches for a particular id and enforces a LIMIT clause, like :
(SELECT *
FROM tblFiles
WHERE storeId = ?
ORDER BY createdDate DESC
LIMIT 10)
UNION
(SELECT *
FROM tblFiles
WHERE storeId = ?
ORDER BY createdDate DESC
LIMIT 10)
...
With this solution only one db hit will happen, and you are guarantee to get the LIMIT on a per id basis. Such a SQL can easily be generated from within php code.
Nb : the maximum allowed of UNIONs in a mysql query is 61.
answered Dec 31 '18 at 10:05
GMBGMB
11.3k2824
This one is nice. But, the query becomes a large one if there are more no.of of IDs (storeId) are there in request.
– Abhishek
Dec 31 '18 at 10:08
1
@Abhishek : 61 UNIONs is the max. Query is large but easy to generate dynamically...
– GMB
Dec 31 '18 at 10:09
add a comment |
You could workaround it with an UNIONed query, where each subquery searches for a particular id and enforces a LIMIT clause, like :
(SELECT *
FROM tblFiles
WHERE storeId = ?
ORDER BY createdDate DESC
LIMIT 10)
UNION
(SELECT *
FROM tblFiles
WHERE storeId = ?
ORDER BY createdDate DESC
LIMIT 10)
...
With this solution only one db hit will happen, and you are guarantee to get the LIMIT on a per id basis. Such a SQL can easily be generated from within php code.
Nb : the maximum allowed of UNIONs in a mysql query is 61.
answered Dec 31 '18 at 10:05
GMBGMB
11.3k2824
You could workaround it with an UNIONed query, where each subquery searches for a particular id and enforces a LIMIT clause, like :
(SELECT *
FROM tblFiles
WHERE storeId = ?
ORDER BY createdDate DESC
LIMIT 10)
UNION
(SELECT *
FROM tblFiles
WHERE storeId = ?
ORDER BY createdDate DESC
LIMIT 10)
...
With this solution only one db hit will happen, and you are guarantee to get the LIMIT on a per id basis. Such a SQL can easily be generated from within php code.
Nb : the maximum allowed of UNIONs in a mysql query is 61.
answered Dec 31 '18 at 10:05
GMBGMB
11.3k2824
edited Dec 31 '18 at 10:08
answered Dec 31 '18 at 10:05
GMBGMB
11.3k2824
answered Dec 31 '18 at 10:05
GMBGMB
11.3k2824
answered Dec 31 '18 at 10:05
GMBGMB
11.3k2824
11.3k2824
This one is nice. But, the query becomes a large one if there are more no.of of IDs (storeId) are there in request.
– Abhishek
Dec 31 '18 at 10:08
1
@Abhishek : 61 UNIONs is the max. Query is large but easy to generate dynamically...
– GMB
Dec 31 '18 at 10:09
add a comment |
This one is nice. But, the query becomes a large one if there are more no.of of IDs (storeId) are there in request.
– Abhishek
Dec 31 '18 at 10:08
1
@Abhishek : 61 UNIONs is the max. Query is large but easy to generate dynamically...
– GMB
Dec 31 '18 at 10:09
This one is nice. But, the query becomes a large one if there are more no.of of IDs (storeId) are there in request.
– Abhishek
Dec 31 '18 at 10:08
This one is nice. But, the query becomes a large one if there are more no.of of IDs (storeId) are there in request.
– Abhishek
Dec 31 '18 at 10:08
1
1
@Abhishek : 61 UNIONs is the max. Query is large but easy to generate dynamically...
– GMB
Dec 31 '18 at 10:09
@Abhishek : 61 UNIONs is the max. Query is large but easy to generate dynamically...
– GMB
Dec 31 '18 at 10:09
add a comment |
use select in where
SELECT * from tblFiles where storeId in (SELECT id from store ORDER BY datefield/id field desc limit 10)
answered Dec 31 '18 at 10:14
RamRam
397
add a comment |
use select in where
SELECT * from tblFiles where storeId in (SELECT id from store ORDER BY datefield/id field desc limit 10)
answered Dec 31 '18 at 10:14
RamRam
397
add a comment |
use select in where
SELECT * from tblFiles where storeId in (SELECT id from store ORDER BY datefield/id field desc limit 10)
answered Dec 31 '18 at 10:14
RamRam
397
use select in where
SELECT * from tblFiles where storeId in (SELECT id from store ORDER BY datefield/id field desc limit 10)
answered Dec 31 '18 at 10:14
RamRam
397
answered Dec 31 '18 at 10:14
RamRam
397
answered Dec 31 '18 at 10:14
RamRam
397
answered Dec 31 '18 at 10:14
RamRam
397
397
add a comment |
add a comment |
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What version of mysql are you on?
– P.Salmon
Dec 31 '18 at 9:57
MySQL version 5.6.28
– Abhishek
Dec 31 '18 at 10:04
checkout this stackoverflow.com/questions/53968285/…
– Jacob
Dec 31 '18 at 10:10