I have a table Exam_record with the data. I need to know how to pullout the latest 2 record for each EID based on latest exam date.
EID | Exam_name | score | date_of_completion |
-----------------------------------------------
1 | Exam_1 | 60 | 23-Jun-2014 |
1 | Exam_1 | 70 | 10-Jan-2014 |
1 | Exam_1 | 71 | 15-Aug-2014 |
1 | Exam_1 | 65 | 1-Sep-2014 |
2 | Exam_2 | 50 | 2-Jul-2014 |
2 | Exam_2 | 55 | 12-May-2014 |
2 | Exam_2 | 65 | 15-Apr-2014 |
Desired output is
EID | Exam_name | score | date_of_completion |
-----------------------------------------------
1 | Exam_1 | 71 | 15-Aug-2014 |
1 | Exam_1 | 65 | 1-Sep-2014 |
2 | Exam_2 | 55 | 12-May-2014 |
2 | Exam_2 | 50 | 2-Jul-2014 |
Try like this:
select * from
(
select *,row_number()over(partition by EID order by date_of_completion desc) as rn from table
)x
where x<=2
more info
Related
I have following table,
+------+-------------+----------+---------+
| id | date | amount | amount2 |
+------+-------------+----------+---------+
| | | | 500 |
| 1 | 1/1/2020 | 1000 | |
+------+-------------+----------+---------+
| | | | 100 |
| 1 | 1/3/2020 | 1558 | |
+------+-------------+----------+---------+
| | | | 200 |
| 1 | 1/3/2020 | 126 | |
+------+-------------+----------+---------+
| | | | 500 |
| 2 | 2/5/2020 | 4921 | |
+------+-------------+----------+---------+
| | | | 100 |
| 2 | 2/5/2020 | 15 | |
+------+-------------+----------+---------+
| | | | 140 |
| 2 | 1/1/2020 | 5951 | |
+------+-------------+----------+---------+
| | | | 10 |
| 2 | 1/2/2020 | 1588 | |
+------+-------------+----------+---------+
| | | | 56 |
| 2 | 1/3/2020 | 1568 | |
+------+-------------+----------+---------+
| | | | 45 |
| 2 | 1/4/2020 | 12558 | |
+------+-------------+----------+---------+
I need to get each Id's max date and its amount and amount2 summations, how can I do this. according to above data, I need following output.
+------+-------------+----------+---------+
| | | | 300 |
| 1 | 1/3/2020 | 1684 | |
+------+-------------+----------+---------+
| | | | 600 |
| 2 | 2/5/2020 | 4936 | |
+------+-------------+----------+---------+
How can I do this.
Aggregate and use MAX OVER to get the IDs' maximum dates:
select id, [date], sum_amount, sum_amount2
from
(
select
id, [date], sum(amount) as sum_amount, sum(amount2) as sum_amount2,
max([date]) over (partition by id) as max_date_for_id
from mytable group by id, [date]
) aggregated
where [date] = max_date_for_id
order by id;
first is to use dense_rank() to find the row with latest date
dense_rank () over (partition by id order by [date] desc)
after that, just simply group by with sum() on the amount
select id, [date], sum(amount), sum(amount2)
from
(
select *,
dr = dense_rank () over (partition by id order by [date] desc)
from your_table
) t
where dr = 1
group by id, [date]
This is what I have right now:
| time | car_id | order | in_order |
|-------|--------|-------|----------|
| 12:31 | 32 | null | 0 |
| 12:33 | 32 | null | 0 |
| 12:35 | 32 | null | 0 |
| 12:37 | 32 | 123 | 1 |
| 12:38 | 32 | 123 | 1 |
| 12:39 | 32 | 123 | 1 |
| 12:41 | 32 | 123 | 1 |
| 12:43 | 32 | 123 | 1 |
| 12:45 | 32 | null | 0 |
| 12:47 | 32 | null | 0 |
| 12:49 | 32 | 321 | 1 |
| 12:51 | 32 | 321 | 1 |
I'm trying to rank orders, including those who have null values, in this case by car_id.
This is the result I'm looking for:
| time | car_id | order | in_order | row |
|-------|--------|-------|----------|-----|
| 12:31 | 32 | null | 0 | 1 |
| 12:33 | 32 | null | 0 | 1 |
| 12:35 | 32 | null | 0 | 1 |
| 12:37 | 32 | 123 | 1 | 2 |
| 12:38 | 32 | 123 | 1 | 2 |
| 12:39 | 32 | 123 | 1 | 2 |
| 12:41 | 32 | 123 | 1 | 2 |
| 12:43 | 32 | 123 | 1 | 2 |
| 12:45 | 32 | null | 0 | 3 |
| 12:47 | 32 | null | 0 | 3 |
| 12:49 | 32 | 321 | 1 | 4 |
| 12:51 | 32 | 321 | 1 | 4 |
I just don't know how to manage a count for the null values.
Thanks!
You can count the number of non-NULL values before each row and then use dense_rank():
select t.*,
dense_rank() over (partition by car_id order by grp) as row
from (select t.*,
count(order) over (partition by car_id order by time) as grp
from t
) t;
I have a table with 3 columns ordernum, username, and amount. I want to select its rows and show an additional column expected.
The rule for calculating the expected column is as follows:
These rows same OrderNum value will be ranking again based on amount column (Desc order). I don't know how I can describe, but the expected result is shown below :(
I tried with RANK() and ROW_NUMBER(), but have not been able to properly apply above algorithm.
This is my table declaration:
CREATE TABLE data
(
ordernum INT,
username NVARCHAR(30),
amount MONEY
);
This is my table content:
+----------+----------+------------+
| ORDERNUM | USERNAME | AMOUNT |
+----------+----------+------------+
| 1 | test01 | 18382.5079 |
| 1 | test02 | 10476.0000 |
| 1 | test03 | 8128.0000 |
| 1 | test04 | 6680.0000 |
| 1 | test05 | 5388.9673 |
| 1 | test06 | 5356.0000 |
| 12 | test07 | 2806.0000 |
| 12 | test08 | 2806.0000 |
| 12 | test09 | 2806.0000 |
| 14 | test10 | 2530.0000 |
| 15 | test11 | 2330.0000 |
| 16 | test12 | 2183.0000 |
| 16 | test13 | 2182.0000 |
| 17 | test14 | 2000.0000 |
| 18 | test15 | 1621.0000 |
+----------+----------+------------+
And this is my expected result:
+----------+----------+------------+----------+
| ORDERNUM | USERNAME | AMOUNT | EXPECTED |
+----------+----------+------------+----------+
| 1 | test01 | 18382.5079 | 1 |
| 1 | test02 | 10476.0000 | 2 |
| 1 | test03 | 8128.0000 | 3 |
| 1 | test04 | 6680.0000 | 4 |
| 1 | test05 | 5388.9673 | 5 |
| 1 | test06 | 5356.0000 | 6 |
| 12 | test07 | 2806.0000 | 12 |
| 12 | test08 | 2806.0000 | 12 |
| 12 | test09 | 2806.0000 | 12 |
| 14 | test10 | 2530.0000 | 15 |
| 15 | test11 | 2330.0000 | 16 |
| 16 | test12 | 2183.0000 | 17 |
| 16 | test13 | 2182.0000 | 18 |
| 17 | test14 | 2000.0000 | 19 |
| 18 | test15 | 1621.0000 | 20 |
+----------+----------+------------+----------+
Here is a fiddle for the problem: https://dbfiddle.uk/?rdbms=sqlserver_2019&fiddle=4014cb469a9ec8f57ded5a5e0e60adaf
This should work.
select
OrderNum,
Username,
Amount,
RANK() over (order by OrderNum) as Expected
from yourTable
I am working with really big data that at the moment I become confused, looking like I'm just repeating one thing.
I want to count the number of trips per user from two tables, trips and session.
psql=> SELECT * FROM trips limit 10;
trip_id | session_ids | daily_user_id | seconds_start | seconds_end
---------+-----------------+---------------+---------------+-------------
400543 | {172079} | 17118 | 1575550944 | 1575551181
400542 | {172078} | 17118 | 1575541533 | 1575542171
400540 | {172077} | 17118 | 1575539001 | 1575539340
400538 | {172076} | 17117 | 1575540499 | 1575541999
400534 | {172074,172075} | 17117 | 1575537161 | 1575539711
400530 | {172073} | 17116 | 1575447043 | 1575447682
400529 | {172071} | 17115 | 1575496394 | 1575497803
400527 | {172070} | 17113 | 1575495241 | 1575496034
400525 | {172068} | 17115 | 1575485658 | 1575489378
400524 | {172067} | 17113 | 1575488721 | 1575490491
(10 rows)
psql=> SELECT * FROM session limit 10;
session_id | user_id | key | start_time | daily_user_id
------------+---------+--------------------------+------------+---------------
172079 | 43 | hLB8S7aSfp4gAFp7TykwYQ==+| 1575550921 | 17118
| | | |
172078 | 43 | YATMrL/AQ7Nu5q2dQTMT1A==+| 1575541530 | 17118
| | | |
172077 | 43 | fOLX4tqvsyFOP3DCyBZf1A==+| 1575538997 | 17118
| | | |
172076 | 7 | 88hwGj4Mqa58juy0PG/R4A==+| 1575540515 | 17117
| | | |
172075 | 7 | 1O+8X49+YbtmoEa9BlY5OQ==+| 1575538384 | 17117
| | | |
172074 | 7 | XOR7hsFCNk+soM75ZhDJyA==+| 1575537405 | 17117
| | | |
172073 | 42 | rAQWwYgqg3UMTpsBYSpIpA==+| 1575447109 | 17116
| | | |
172072 | 276 | 0xOsxRRN3Sq20VsXWjlrzQ==+| 1575511120 | 17114
| | | |
172071 | 7 | P4beN3W/ZrD+TCpZGYh23g==+| 1575496642 | 17115
| | | |
172070 | 43 | OFi30Zv9e5gmLZS5Vb+I7Q==+| 1575495238 | 17113
| | | |
(10 rows)
Goal: get the distribution of trips per user
Attempt:
psql=> SELECT COUNT(distinct trip_id) as trips
, count(distinct user_id) as users
, extract(year from to_timestamp(seconds_start)) as year_date
, extract(month from to_timestamp(seconds_start)) as month_date
FROM trips
INNER JOIN session
ON session_id = ANY(session_ids)
GROUP BY year_date, month_date
ORDER BY year_date, month_date;
+-------+-------+-----------+------------+
| trips | users | year_date | month_date |
+-------+-------+-----------+------------+
| 371 | 44 | 2016 | 3 |
| 12207 | 185 | 2016 | 4 |
| 3859 | 88 | 2016 | 5 |
| 1547 | 28 | 2016 | 6 |
| 831 | 17 | 2016 | 7 |
| 427 | 4 | 2016 | 8 |
| 512 | 13 | 2016 | 9 |
| 431 | 11 | 2016 | 10 |
| 1011 | 26 | 2016 | 11 |
| 791 | 15 | 2016 | 12 |
| 217 | 8 | 2017 | 1 |
| 490 | 17 | 2017 | 2 |
| 851 | 18 | 2017 | 3 |
| 1890 | 66 | 2017 | 4 |
| 2143 | 43 | 2017 | 5 |
| . | | | |
| . | | | |
| . | | | |
+-------+-------+-----------+------------+
This resultset count number of users and trips, my intention is actually to get an analysis of trips per user, like so:
+------+-------------+
| user | no_of_trips |
+------+-------------+
| 1 | 489 |
| 2 | 400 |
| 3 | 12 |
| 4 | 102 |
| . | |
| . | |
| . | |
+------+-------------+
How do I do this, please?
You seem to just want aggregation by user_id:
SELECT s.user_id, COUNT(distinct t.trip_id) as trips
FROM trips t INNER JOIN
session s
ON s.session_id = ANY(t.session_ids)
GROUP BY s.user_id ;
I'm pretty sure that the COUNT(DISTINCT) is unnecessary, so I would advise removing it:
SELECT s.user_id, COUNT(*) as trips
FROM trips t INNER JOIN
session s
ON s.session_id = ANY(t.session_ids)
GROUP BY s.user_id ;
I have four tables as below:
tblAccount
Id i sprimary key
+----+-----------------+
| Id | AccName |
+----+-----------------+
| 1 | AccountA |
| 2 | AccountB |
+----+-----------------+
tblLocation
Id is primary key.
+----+---------------+
| Id | LocName |
+----+---------------+
| 1 | LocationA |
| 2 | LocationB |
| 3 | LocationC |
+----+---------------+
tblAccountwiseLocation
Id i sprimary key.LocId and AccId are foreign key.
+----+---------------+---------------+
| Id | LocId | AccId |
+----+---------------+---------------+
| 1 | 1 | 1 |
| 2 | 2 | 1 |
| 3 | 3 | 1 |
| 4 | 1 | 2 |
| 5 | 2 | 2 |
| 6 | 3 | 2 |
+----+---------------+---------------+
tblRSCMaster
Id i sprimary key.LocId and AccId are foreign key.
+----+---------------+---------------+----------------+------------------+
| Id | LocId | AccId | RSCNo | DateOfAddition |
+----+---------------+---------------+----------------+------------------+
| 1 | 1 | 1 | Acc1_Loc1_1_14 | 15/01/2014 |
| 2 | 2 | 1 | Acc1_Loc2_1_14 | 15/01/2014 |
| 3 | 3 | 1 | Acc1_Loc2_1_14 | 15/01/2014 |
| 4 | 1 | 2 | Acc2_Loc1_1_14 | 15/01/2014 |
| 5 | 2 | 2 | Acc2_Loc2_1_14 | 15/01/2014 |
| 6 | 3 | 2 | Acc2_Loc3_1_14 | 15/01/2014 |
| 7 | 1 | 1 | Acc1_Loc1_2_14 | 15/02/2014 |
| 8 | 2 | 1 | Acc1_Loc2_2_14 | 15/02/2014 |
| 9 | 3 | 1 | Acc1_Loc3_2_14 | 15/02/2014 |
| 10 | 1 | 2 | Acc2_Loc1_2_14 | 15/02/2014 |
| 11 | 2 | 2 | Acc2_Loc2_2_14 | 15/02/2014 |
| 12 | 3 | 2 | Acc2_Loc3_2_14 | 15/02/2014 |
| 13 | 1 | 1 | Acc1_Loc1_3_14 | 15/03/2014 |
| 14 | 2 | 1 | Acc1_Loc2_3_14 | 15/03/2014 |
| 15 | 3 | 1 | Acc1_Loc3_3_14 | 15/03/2014 |
| 16 | 1 | 2 | Acc2_Loc1_3_14 | 15/03/2014 |
| 17 | 2 | 2 | Acc2_Loc2_3_14 | 15/03/2014 |
| 18 | 3 | 2 | Acc2_Loc3_3_14 | 15/03/2014 |
| 19 | 1 | 1 | Acc1_Loc1_4_14 | 15/04/2014 |
| 20 | 2 | 1 | Acc1_Loc2_4_14 | 15/04/2014 |
| 21 | 3 | 1 | Acc1_Loc3_4_14 | 15/04/2014 |
| 22 | 1 | 2 | Acc2_Loc1_4_14 | 15/04/2014 |
| 23 | 2 | 2 | Acc2_Loc2_4_14 | 15/04/2014 |
| 24 | 3 | 2 | Acc2_Loc3_4_14 | 15/04/2014 |
| 25 | 1 | 1 | Acc1_Loc1_5_14 | 15/05/2014 |
| 26 | 2 | 1 | Acc1_Loc2_5_14 | 15/05/2014 |
| 27 | 3 | 1 | Acc1_Loc3_5_14 | 15/05/2014 |
| 28 | 1 | 2 | Acc2_Loc1_5_14 | 15/05/2014 |
| 29 | 2 | 2 | Acc2_Loc2_5_14 | 15/05/2014 |
| 30 | 3 | 2 | Acc2_Loc3_5_14 | 15/05/2014 |
+----+---------------+---------------+----------------+------------------+
Acc1_Loc1_1_14 resembles RSC for LocationA of AccountA for Jan 2014.
I need to get a output as below from tblRSCMaster.
+---------------+---------------+----------------+------------------+
| LocId | AccId | RSCNo | DateOfAddition |
+---------------+---------------+----------------+------------------+
| 1 | 1 | Acc1_Loc1_3_14 | 15/03/2014 |
| 1 | 1 | Acc1_Loc1_4_14 | 15/04/2014 |
| 1 | 1 | Acc1_Loc1_5_14 | 15/05/2014 |
| 2 | 1 | Acc1_Loc2_3_14 | 15/03/2014 |
| 2 | 1 | Acc1_Loc2_4_14 | 15/04/2014 |
| 2 | 1 | Acc1_Loc2_5_14 | 15/05/2014 |
| 3 | 1 | Acc1_Loc3_3_14 | 15/03/2014 |
| 3 | 1 | Acc1_Loc3_4_14 | 15/04/2014 |
| 3 | 1 | Acc1_Loc3_5_14 | 15/05/2014 |
+---------------+---------------+----------------+------------------+
Each account has multiple locations and each location has multiple RSCs.
I need to get last three RSCs for each location for AccountA.
I have tried the below query:
SELECT tblAccountwiseLocation.LocId,tblAccountwiseLocation.AccId,tblRSCMaster.RSCNo,tblRSCMaster.DateOfAddition FROM tblAccountwiseLocation
INNER JOIN tblRSCMaster ON tblAccountwiseLocation.LocId= tblRSCMaster.LocId
where tblRSCMaster.AccId=1
But not getting the proper output.
Please help me out.
Thank you all in advance.
You can wrap the existing query inside a common table expression, and use ROW_NUMBER() to get only the last 3 (by tblRSCMaster.DateOfAddition) entries per tblAccountwiseLocation.LocId.
WITH cte AS (
SELECT tblAccountwiseLocation.LocId,
tblAccountwiseLocation.AccId,
tblRSCMaster.RSCNo,
tblRSCMaster.DateOfAddition,
ROW_NUMBER() OVER (PARTITION BY tblAccountwiseLocation.LocId
ORDER BY tblRSCMaster.DateOfAddition DESC) rn
FROM tblAccountwiseLocation
INNER JOIN tblRSCMaster
ON tblAccountwiseLocation.LocId = tblRSCMaster.LocId
AND tblAccountwiseLocation.AccId = tblRSCMaster.AccId
WHERE tblRSCMaster.AccId=1
)
SELECT LocId, AccId, RSCNo, DateOfAddition
FROM cte
WHERE rn <= 3
ORDER BY LocId, AccId, DateOfAddition
An SQLfiddle to test with.
Is this what you need?
select m.*
from (select m.*, row_number() over (partition by accID
order by DateOfAddition desc) as seqnum
from tblRSCMaster
where m.locid = 1
) m
where seqnum <= 3
order by AccId, DateOfAddition;
I think you need to filter on the locid rather than on the AccId to get what you want.