EDIT I forget an important detail
I have a postgresql table like this:
| id | n_1 | n_2 |
| 1 | 3 | 5 |
| 1 | 2 | 6 |
| 1 | 8 | 4 |
| 1 | 1 | 5 |
| 2 | 4 | 3 |
| 2 | 5 | 1 |
I want to get the min values and the count count only if n_2 >= min(n_1):
| id | n_1 | n_2 | count |
| 1 | 1 | 4 | 4 |
| 2 | 4 | 1 | 0 |
The min number from n_1, min number from n_2 and count total when n_2 >= min(n_1) records from each id.
Any help?
here how you can do it by grouping them by id :
select id , min(n_1) ,min(n_2), count(case when n_2 >= min_n_1 then 1 end)
from ( select *, min(n_1) over (partition by id) as min_n_1 from table) t
group by id
I think this is just aggregation:
select id, min(n_1), min(n_2), count(*)
from t
group by id;
Related
user_id | sum | app_id | app_count
---------+------+--------+-----------
1 | 100 | 3 | 1
2 | 300 | 2 | 1
4 | 1100 | 1 | 2
4 | 1100 | 4 | 1
How do I write the query such that distinct user_id is selected based on the rank of app_count?
Here is the result I want:
user_id | sum | app_id | app_count
---------+------+--------+-----------
1 | 100 | 3 | 1
2 | 300 | 2 | 1
4 | 1100 | 1 | 2
In Postgres, you would use distinct on:
select distinct on (user_id) t.*
from t
order by user_id, app_count desc;
I have a table that looks like this
+----+------------+------+
| ID | Session_ID | Type |
+----+------------+------+
| 1 | 1 | 2 |
| 2 | 1 | 4 |
| 3 | 1 | 2 |
| 4 | 2 | 2 |
| 5 | 2 | 2 |
| 6 | 3 | 2 |
| 7 | 3 | 1 |
+----+------------+------+
And I would like to count all occurences of a type that are in a sequence.
Output look some how like this:
+------------+------+-----+
| Session_ID | Type | cnt |
+------------+------+-----+
| 1 | 2 | 1 |
| 1 | 4 | 1 |
| 1 | 2 | 1 |
| 2 | 2 | 2 |
| 3 | 2 | 1 |
| 3 | 1 | 1 |
+------------+------+-----+
A simple group by like
SELECT session_id, type, COUNT(type)
FROM table
GROUP BY session_id, type
doesn't work, since I need to group only rows that are "touching".
Is this possible with a merge sql-select or will I need some sort of coding. Stored Procedure or Application side coding?
UPDATE Sequence:
If the following row has the same type, it should be counted (ordered by ID).
to determine the sequence the ID is the key with the session_ID, since I just want to group rows with the same session_ID.
So if there are 3 rows is in one session
row with the ID 1 has type 1,
and the second row has type 1
and row 3 has type 2
Input:
+----+------------+------+
| ID | Session_ID | Type |
+----+------------+------+
| 1 | 1 | 1 |
| 2 | 1 | 1 |
| 3 | 1 | 2 |
+----+------------+------+
The squence is Row 1 to Row 2. This three row should output
Output:
+------------+------+-------+
| Session_ID | Type | count |
+------------+------+-------+
| 1 | 1 | 2 |
| 3 | 2 | 1 |
+------------+------+-------+
You can use a difference of id and row_number() to identify the gaps and then perform your count
;with cte as
(
Select *, id - row_number() over (partition by session_id,type order by id) as grp
from table
)
select session_id,type,count(*) as cnt
from cte
group by session_id,type,grp
order by max(id)
I have a table which has multiple records for the same id. Looks like this, and the rows are sorted by sequence number.
+----+--------+----------+----------+
| id | result | duration | sequence |
+----+--------+----------+----------+
| 1 | 12 | 7254 | 1 |
+----+--------+----------+----------+
| 1 | 12 | 2333 | 2 |
+----+--------+----------+----------+
| 1 | 11 | 1000 | 3 |
+----+--------+----------+----------+
| 1 | 6 | 5 | 4 |
+----+--------+----------+----------+
| 1 | 3 | 20 | 5 |
+----+--------+----------+----------+
| 2 | 1 | 230 | 1 |
+----+--------+----------+----------+
| 2 | 9 | 10 | 2 |
+----+--------+----------+----------+
| 2 | 6 | 0 | 3 |
+----+--------+----------+----------+
| 2 | 1 | 5 | 4 |
+----+--------+----------+----------+
| 2 | 12 | 3 | 5 |
+----+--------+----------+----------+
E.g. for id=1, i would like to sum the duration for all the rows before and include result=6, which is 7254+2333+1000+5. Same for id =2, it would be 230+10+0. Anything after the row where result=6 will be left out.
My expected output:
+----+----------+
| id | duration |
+----+----------+
| 1 | 10592 |
+----+----------+
| 2 | 240 |
+----+----------+
The sequence has to be in ascending order.
I'm not sure how I can do this in sql.
Thank you in advance!
I think you want:
select t2.id, sum(t2.duration)
from t
where t.sequence <= (select t2.sequence
from t t2
where t2.id = t.id and t2.result = 6
);
In PrestoDB, I would recommend window functions:
select id, sum(duration)
from (select t.*,
min(case when result = 6 then sequence end) over (partition by id) as sequence_6
from t
) t
where sequence <= sequence_6;
You can use a simple aggregate query with a condition that uses a subquery to recover the sequence corresponding to the record whose sequence is 6 :
SELECT t.id, SUM(t.duration) total_duration
FROM mytable t
WHERE t.sequence <= (
SELECT sequence
FROM mytable
WHERE id = t.id AND result = 6
)
GROUP BY t.id
This demo on DB Fiddle with your test data returns :
| id | total_duration |
| --- | -------------- |
| 1 | 10592 |
| 2 | 240 |
Basic group by query should solve your issue
select
id,
sum(duration) duration
from t
group by id
for the certain rows:
select
id,
sum(duration) duration
from t
where id = 1
group by id
if you want to include it in your result set
select id, duration, sequence from t
union all
select
id,
sum(duration) duration
null sequence
from t
group by id
I want to select from a table if row counts of similar filed is maximum depends on other columns.
As example
| user_id | team_id | isOk |
| 1 | 1 | 1 |
| 2 | 1 | 1 |
| 3 | 1 | 1 |
| 4 | 1 | 1 |
| 5 | 2 | 1 |
| 6 | 2 | 1 |
| 7 | 2 | 1 |
| 8 | 3 | 1 |
| 9 | 3 | 1 |
| 10 | 3 | 1 |
| 11 | 3 | 0 |
So i want to select team 1 and 2 because they all have 1 value at isOk Column,
i tried to use this query
SELECT Team
FROM _Table1
WHERE isOk= 1
GROUP BY Team
HAVING COUNT(*) > 3
But still i have to define a row count which can be maximum or not.
Thanks in advance.
Is this what you are looking for?
select team
from _table1
group by team
having min(isOk) = 1;
I have an issue where I need group a set of values and increase the group number when the variance between 2 columns is greater than or equal to 4, please see below.
UPDATE: I added a date column so you can view the order, but I need the group to update based off of the variance not the date.
+--------+-------+-------+----------+--------------+
| Date | Col 1 | Col 2 | Variance | Group Number |
+--------+-------+-------+----------+--------------+
| 1-Jun | 2 | 1 | 1 | 1 |
| 2-Jun | 1 | 1 | 0 | 1 |
| 3-Jun | 3 | 2 | 1 | 1 |
| 4-Jun | 4 | 1 | 3 | 1 |
| 5-Jun | 5 | 1 | 4 | 2 |
| 6-Jun | 1 | 1 | 0 | 2 |
| 7-Jun | 23 | 12 | 11 | 3 |
| 8-Jun | 12 | 11 | 1 | 3 |
| 9-Jun | 2 | 1 | 1 | 3 |
| 10-Jun | 13 | 4 | 9 | 4 |
| 11-Jun | 2 | 1 | 1 | 4 |
+--------+-------+-------+----------+--------------+
The group number is simply the number of times that 4 or greater appears in the variance column. You can get this using a correlated subquery:
select t.*,
(select 1 + count(*)
from table t2
where t2.date < t.date and t2.variance >= 4
) as GroupNumber
from table t;
In SQL Server 2012+, you can also do this using a cumulative sum:
select t.*,
sum(case when variance >= 4 then 1 else 0 end) over
(order by date rows between unbounded preceding and 1 preceding
) as GroupNumber
from table t;