I'm trying to generate a summary from a table using SQLite as below.
I need to aggregate 1) number of times each model was driven, 2) total distance driven & 3) get distinct values for driver col & count the number of times each driver has driven the particular model - GROUP BY modelwith COUNT(model) & SUM(distance) will help with 1 & 2 - `I need help with the last part #3 , what is the right approach to find number of occurrences for each distinct values of a column and add them as new columns for each model ?
My table is:
id model datetime driver distance
---|-----|------------|--------|---------
1 | S | 04/03/2009 | john | 399
2 | X | 04/03/2009 | juliet | 244
3 | 3 | 04/03/2009 | borat | 555
4 | 3 | 03/03/2009 | john | 300
5 | X | 03/03/2009 | juliet | 200
6 | X | 03/03/2009 | borat | 500
7 | S | 24/12/2008 | borat | 600
8 | X | 01/01/2009 | borat | 700
Result would be
id model| drives distance john juliet borat
---|-----|--------|---------|------|------ |------
1 | S | 2 | 999 | 1 | 0 | 1
2 | X | 4 | 1644 | 0 | 2 | 2
3 | 3 | 2 | 855 | 1 | 0 | 1
OK... this time I got it!
select new_table.model, count (new_table.model) as drives, sum (new_table.distance) as distance,
sum(case when driver = 'john' then 1 else 0 end) as john,
sum(case when driver = 'juliet' then 1 else 0 end) as juliet,
sum(case when driver = 'borat' then 1 else 0 end) as borat
from new_table
group by model
It's not 100%, but this should get you most of the way there.
CREATE TABLE DBO.TEST_TABLE (ID INT,MODEL CHAR(1),DATETIME VARCHAR(255),DRIVER VARCHAR(255),DISTANCE INT)
INSERT INTO DBO.TEST_TABLE
VALUES
(1,'S','04/03/2009','JOHN',399)
,(2,'X','04/03/2009','JULIET',244)
,(3,'3','04/03/2009','BORAT',555)
,(4,'3','03/03/2009','JOHN',300)
,(5,'X','03/03/2009','JULIET',200)
,(6,'X','03/03/2009','BORAT',500)
,(7,'S','24/12/2008','BORAT',600)
,(8,'X','01/01/2009','BORAT',700)
Declare #Query_ nvarchar(MAX)
Declare #Cols_For_Pivot_ nvarchar(MAX)
SELECT #Cols_For_Pivot_= COALESCE(#Cols_For_Pivot_ + ',','') + QUOTENAME(DRIVER)
FROM (SELECT DISTINCT DRIVER FROM DBO.TEST_TABLE) AS PivotTable
IF OBJECT_ID('tempdb..#TEMP') IS NOT NULL DROP TABLE #TEMP
SET #Query_ =
N'SELECT DISTINCT
MODEL
,COUNT(DATETIME) OVER(PARTITION BY MODEL) AS DRIVES
,SUM(DISTANCE) OVER(PARTITION BY MODEL) AS DISTANCE
, ' + #Cols_For_Pivot_ + '
INTO #TEMP
FROM DBO.TEST_TABLE
PIVOT(COUNT(DRIVER)
FOR DRIVER IN (' + #Cols_For_Pivot_ + ')) AS P'
EXEC sp_executesql #Query_
Related
I have a database that I don't control the source of directly and results in errant '0' entries which mess up generated graphs with these drops to zero. I am able to manipulate the data after the fact and update that database.
It is acceptable that the last known good value can be used instead and so I am trying to make a general query that will remove all the zeros and populate it with the last known value.
Luckily, every entry includes the ID of the last entry and so it is a matter of simply looking back and grabbing it.
I have got very close to a final answer, but instead of updating with the last good value, it just uses the first value over and over again.
dummy data
CREATE TABLE tbl(id INT,r INT,oid INT);
INSERT INTO tbl VALUES(1,10,0);
INSERT INTO tbl VALUES(2,20,1);
INSERT INTO tbl VALUES(3,0,2);
INSERT INTO tbl VALUES(4,40,3);
INSERT INTO tbl VALUES(5,50,4);
INSERT INTO tbl VALUES(6,0,5);
INSERT INTO tbl VALUES(7,70,6);
INSERT INTO tbl VALUES(8,80,7);
SELECT * FROM tbl;
OUTPUT:
| id| r |oid|
|---|----|---|
| 1 | 10 | 0 |
| 2 | 20 | 1 |
| 3 | 0 | 2 | ** NEEDS FIXING
| 4 | 40 | 3 |
| 5 | 50 | 4 |
| 6 | 0 | 5 | ** NEEDS UPDATE
| 7 | 70 | 6 |
| 8 | 80 | 7 |
I have worked several queries to get results around what I am after:
All zero entries:
SELECT * FROM tbl WHERE r = 0;
OUTPUT:
| id | r | oid |
|----|----|-----|
| 3 | 0 | 2 |
| 6 | 0 | 5 |
Output only the those rows with the preceding good row
SELECT * FROM tbl WHERE A in (
SELECT id FROM tbl WHERE r = 0
UNION
SELECT oid FROM tbl WHERE r = 0
)
OUTPUT:
| id| r |oid|
|---|----|---|
| 2 | 20 | 1 |
| 3 | 0 | 2 |
| 5 | 50 | 4 |
| 6 | 0 | 5 |
Almost works
This is as close as I have got, it does change all the zero's, but it changes them all to the value of the first lookup
UPDATE tbl
SET r = (SELECT r
FROM tbl
WHERE id in (SELECT oid
FROM tbl
WHERE r = 0)
) WHERE r = 0 ;
OUTPUT:
| id| r |oid|
|---|----|---|
| 1 | 10 | 0 |
| 2 | 20 | 1 |
| 3 | 20 | 2 | ** GOOD
| 4 | 40 | 3 |
| 5 | 50 | 4 |
| 6 | 20 | 5 | ** BAD, should be 50
| 7 | 70 | 6 |
| 8 | 80 | 7 |
If it helps, I created this fiddle here that I've been playing with:
http://sqlfiddle.com/#!5/8afff/1
For this sample data all you have to do is use the correct correlated subquery that returns the value of r from the row with id equal to the current oid in the WHERE clause:
UPDATE tbl AS t
SET r = (SELECT tt.r FROM tbl tt WHERE tt.id = t.oid)
WHERE t.r = 0;
See the demo.
Assuming the following table and using sqlite I have the following question:
Node |Loadcase | Fx | Cluster
---------------------------------
1 | 1 | 50 | A
2 | 1 | -40 | A
3 | 1 | 60 | B
4 | 1 | 80 | C
1 | 2 | 50 | A
2 | 2 | -50 | A
3 | 2 | 80 | B
4 | 2 | -100 | C
I am trying to write a query which fetches the maximum absolute value of Fx and the Load case for each Node 1-4.
An additional requirement is that Fx having the same Cluster shall be summed up before making this query .
In the example above I would expect the following results:
Node | Loadcase | MaxAbsClusteredFx
-----|-----------|-------------------
1 | 1 | 10
2* | |
3 | 2 | 80
4 | 2 | 100
N/A because summed up with node one. Both belonging to cluster A
Query:
For Node 1 I would execute a query similar to this
SELECT Loadcase,abs(Fx GROUP BY Cluster) FROM MyTable WHERE abs(Fx GROUP BY Cluster) = max(abs(Fx GROUP BY Cluster)) AND Node = 1
I keep getting " Error while executing query: near "Forces": syntax error " or alike.
Thankful for any help!
In SQLite I have a collection of records and I want to only show the records with specific differences.
The table has something like the following values:
file | idx | values
------|-------|----------------------
1 | 101 | 1,3,7,11,23,11
2 | 101 | 1,3,7,11,23,11
3 | 101 | 0,4,8,60,20,11
1 | 211 | 12,11,23
2 | 211 | 12,0,23
3 | 211 | 12,0,23
1 | 300 | 1
2 | 300 | 0
3 | 300 | 0
I want to be able to select two different fileIDs, and compare them.
I mean, I want to examine only records with (file = 1 AND file = 2)
What I cant to get back as a result is a collection of records that are not the same:
file | idx | values
------|-------|----------------------
1 | 211 | 12,11,23
2 | 211 | 12,0,23
1 | 300 | 1
2 | 300 | 0
So you do not want rows for which another row with the same idx and values values exists:
SELECT *
FROM MyTable
WHERE file IN (1, 2)
AND NOT EXISTS (SELECT *
FROM MyTable AS T2
WHERE file IN (1, 2)
AND file <> MyTable.file
AND idx = MyTable.idx
AND values = MyTable.values);
I just recieved an answer in another forum. This seems to work:
select * from thetable a, thetable b
where a.file <> b.file and a.idx = b.idx and a.values <> b.values and
a.file in (1, 2) and b.file in (1, 2);
Of course I change certain values as variables in a prepared statement. But it did the trick
I want to use SELECT * from multiple tables table1 and table2 to get the output table which is nothing but table2 data appended to table1. How do I construct the SELECT * FROM statement ?
Table1:
id model datetime driver distance
---|-----|------------|--------|---------
1 | S | 04/03/2009 | john | 399
2 | X | 04/03/2009 | juliet | 244
3 | 3 | 04/03/2009 | borat | 555
Table2:
id model datetime driver distance
---|-----|------------|--------|---------
4 | 3 | 03/03/2009 | john | 300
5 | X | 03/03/2009 | juliet | 200
Desired output:
model datetime driver distance
-----|------------|--------|---------
S | 04/03/2009 | john | 399
X | 04/03/2009 | juliet | 244
3 | 04/03/2009 | borat | 555
3 | 03/03/2009 | john | 300
X | 03/03/2009 | juliet | 200
Try this out this might help you
SELECT table1.model, table1.datetime, table1.driver, table1.distance FROM table1
UNION ALL SELECT table2.model, table2.datetime, table2.driver, table2.distance FROM table2;
union statement get slow for fetching the large data from the db, you can use join here,
select * from table0 left join table2 on table0.b = table2.b where table2.col is not null
does anyone know if there is a way to get this result in SQLite.
Given table with single column x like this:
x |
--
1
4
5
2
I need to add column dx, which is simply a difference x_i - x_{i-1} (except for the first one) like this:
x | dx |
-- --
1 | 0
4 | 3
5 | 1
2 | -3
Thanks a lot!
Update: given there is id column:
id | x |
-- --
1 | 1
2 | 4
3 | 5
4 | 2
Is it possible to obtain:
id | x | dx |
-- -- --
1 | 1 | 0
2 | 4 | 3
3 | 5 | 1
4 | 2 | -3
SQL tables have no implicit order associated with them. You must supply an ORDER BY clause to impose an order on the results.
What column would you order by to define the predecessor row for the subtraction? (Hint: there is none.)
With the addition of an id column per the revised question
sqlite> select id, x, (select t1.x - t2.x from t as t2 where id = t1.id - 1) from t as t1;
1|1|
2|4|3
3|5|1
4|2|-3
Or
sqlite> select id, x, coalesce((select t1.x - t2.x from t as t2 where id = t1.id - 1),0) from t as t1;
1|1|0
2|4|3
3|5|1
4|2|-3