Using Sql Server Mgmt Studio. My data set is as below.
ID Days Value Threshold
A 1 10 30
A 2 20 30
A 3 34 30
A 4 25 30
A 5 20 30
B 1 5 15
B 2 10 15
B 3 12 15
B 4 17 15
B 5 20 15
I want to run a query so only rows after the threshold has been reached are selected for each ID. Also, I want to create a new days column starting at 1 from where the rows are selected. The expected output for the above dataset will look like
ID Days Value Threshold NewDayColumn
A 3 34 30 1
A 4 25 30 2
A 5 20 30 3
B 4 17 15 1
B 5 20 15 2
It doesn't matter if the data goes below the threshold for the latter rows, I want to take the first row when threshold is crossed as 1 and continue counting rows for the ID.
Thank you!
You can use window functions for this. Here is one method:
select t.*, row_number() over (partition by id order by days) as newDayColumn
from (select t.*,
min(case when value > threshold then days end) over (partition by id) as threshold_days
from t
) t
where days >= threshold_days;
Related
I'm trying to prepare my data to create a burndown visual. As you can see the Rate column isn't simply A - B, as it carries forward the previous value if B is null.
I've tried some case statements using lag and sums but no avail.
Some direction on the case statement or an optimal solution would be ideal.
For example, this is how my data looks:
ID
A
B
1
20
NULL
2
20
3
3
20
NULL
4
20
7
5
20
NULL
6
20
NULL
7
20
NULL
8
20
5
9
20
7
And I want a rate column that looks like this.
ID
A
B
Rate
1
20
NULL
20
2
20
3
17
3
20
NULL
17
4
20
7
10
5
20
NULL
10
6
20
NULL
10
7
20
NULL
10
8
20
5
5
9
20
7
-2
Thanks to #Larnu for the guidance.
Here is the solution when you have your data partitioned by some group ID and ordered by some data or row ID.
SELECT
GROUP_ID,
ROW_ID,
COL_A,
COL_B,
COL_A - (SUM(ISNULL(COL_B,0)) OVER (PARTITION BY GROUP_ID ORDER BY ROW_ID ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW))
FROM table
In my SQL Server 2008 stored procedure, I have a table variable with RecordID, TotalMinutes, ProcessID.
Declare #tblSum table(RecordID int, TotalMinutes int, ProcessID int)
RecordID is my primary key, total minutes is the total minutes, and I have different processes but these processes are repeated multiple times on my data.
Here is an example of my data:
RecordID TotalMinutes ProcessID
--------------------------------------------
1 10 1
2 20 1
3 30 1
4 10 2
5 40 2
6 10 2
7 10 3
8 55 3
9 60 3
10 15 4
My plan is to return the data by totaling or adding all the data with same ProcessID and put it on a new table variable with FinalMinutes column just like the table below:
RecordID TotalMinutes ProcessID FinalMinutes
-----------------------------------------------------
1 10 1 60
2 20 1 60
3 30 1 60
4 10 2 80
5 60 2 80
6 10 2 80
7 10 3 125
8 55 3 125
9 60 3 125
10 15 4 15
I cannot do a group by since it will cut the result into 4 rows. I need to retain the number of rows, and every data it has, I will just add a FinalMinutes column on a new table variable.
Here is one way using SUM()Over() windowed aggregate function
Select *,
FinalMinutes = sum(TotalMinutes)over(partition by ProcessID)
From yourtable
I am trying to change something like this:
Index Record Time
1 10 100
1 10 200
1 10 300
1 10 400
1 3 500
1 10 600
1 10 700
2 10 800
2 10 900
2 10 1000
3 5 1100
3 5 1200
3 5 1300
into this:
Index CountSeq Record LastTime
1 4 10 400
1 1 3 500
1 2 10 700
2 3 10 1000
3 3 5 1300
I am trying to apply this logic per unique index -- I just included three indexes to show the outcome.
So for a given index I want to combine them by streaks of the same Record. So notice that the first four entries for Index 1 have Records 10, but it is more succinct to say that there were 4 entries with record 10, ending at time 400. Then I repeat the process going forward, in sequence.
In short I am trying to perform a count-grouping over sequential chunks of the same Record, within each index. In other words I am NOT looking for this:
select index, count(*) as countseq, record, max(time) as lasttime
from Table1
group by index,record
Which combines everything by the same record whereas I want them to be separated by sequence breaks.
Is there a way to do this in SQL?
It's hard to solve your problem without having a single primary key, so I'll assume you have a primary key column that increases each row (primkey). This request would return the same table with a 'diff' column that has value 1 if the previous primkey row has the same index and record as the current one, 0 otherwise :
SELECT *,
IF((SELECT index, record FROM yourTable p2 WHERE p1.primkey = p2.primkey)
= (SELECT index, record FROM yourTable p2 WHERE p1.primkey-1 = p2.primkey), 1, 0) as diff
FROM yourTable p1
If you use a temporary variable that increases each time the IF expression is false, you would get a result like this :
primkey Index Record Time diff
1 1 10 100 1
2 1 10 200 1
3 1 10 300 1
4 1 10 400 1
5 1 3 500 2
6 1 10 600 3
7 1 10 700 3
8 2 10 800 4
9 2 10 900 4
10 2 10 1000 4
11 3 5 1100 5
12 3 5 1200 5
13 3 5 1300 5
Which would solve your problem, you would just add 'diff' to the group by clause.
Unfortunately I can't test it on sqlite, but you should be able to use variables like this.
It's probably a dirty workaround but I couldn't find any better way, hope it helps.
I have a dataset like below, but longer. I want to ensure I am picking the 'fleet_id' in terms of their 'StarDriver' value overall, but I want to return only two results for each 'supplier_id' and return a max of 20 in total.
(I'm sorry I didnt work out how to copy the below in proper formatting, couldn't find from toolbar above and google results were about copying data; would also be grateful if someone would point out how)
fleet_id supplier_id Ratings Driver Punctuality Car StarDriver
19442 151 10 5 5 5 5
19634 151 11 5 5 5 5
19437 151 12 5 5 5 5
12832 10 14 5 4.92857142857143 5 4.97619047619048
12217 111 10 5 5 4.9 4.96666666666667
21135 158 19 5 4.89473684210526 5 4.96491228070175
19436 151 14 4.85714285714286 5 5 4.95238095238095
12239 111 12 4.91666666666667 5 4.91666666666667 4.94444444444445
10520 92 12 4.91666666666667 5 4.91666666666667 4.94444444444445
19997 151 12 5 5 4.83333333333333 4.94444444444444
To limit to the top 2 for each supplier, use row_number(). This will enumerate the rows and you can choose just two with where seqnum <= 2.
The rest of the query is just selecting 20 rows based on a field:
select top 20 t.*
from (select t.*,
row_number() over (partition by supplier order by StarDriver desc) as seqnum
from table t
) t
where seqnum <= 2
order by StarDriver;
Need your help with a SQL query in Oracle db. I have data that I want to partition into groups when event = "Start". E.g. Row 1-6 is a group, row 7-9 is a group. I want to ignore rows with event = "Ignore". Finally I want to calculate max(Value)-min(Value) for these groups. I dont have any way to group the data.
Can this be achieved? Is it possible to use partition by Event = start. Same data is below:
Row Event Value Required Result is max-min of value
1 Start 10
2 A 11
3 B 12
4 C 13
5 D 14
6 E 15 5
--------------------------------------------
7 Start 16
8 A 18
9 B 20 4
--------------------------------------------
10 Start 27
11 A 30
12 B 33
13 C 34 7
--------------------------------------------
14 Ignore 35
--------------------------------------------
15 Ignore 36
--------------------------------------------
16 Start 33
17 A 34
18 B 35
19 C 36
20 D 37
21 E 38 5
--------------------------------------------
Yes, you can do this in SQL.
The following query first finds the group that a row is in, by finding the largest start before the row id. This version uses a correlated subquery for this calculation.
It then does the grouping on the id and does the calculation.
select groupid, max(value) - min(value)
from (select t.*,
(select max(row) from t t2 where t2.row < t.row and t2.event = start
) as groupid
from t
) t
where event <> 'IGNORE'