I have a table named "number" with 4 columns (id, N1,N2,N3) like this:
id = 1,2 3, 4
N1 = 22 , 14 , 13 , 15
N2 = 13 , 11 , 80 , 11
N3 = 11 , 22 , 47 , 23
Can I count the total frequency of individual numbers in this table?
(11 = 3) ** (22=2) etc..
For one column my query is:
"SELECT N1, COUNT(*) as Frequency FROM number GROUP BY n1 order by count(*) desc"
Thanks for the possible help
try this:
SELECT t.num, COUNT(t.num)
FROM (SELECT N1 AS num FROM number
UNION ALL
SELECT N2 AS num FROM number
UNION ALL
SELECT N3 AS num FROM number) AS t
GROUP BY t.num
ORDER BY COUNT(t.num) desc;
fiddle demo
UNION operator
Related
I have following table:
Id
offset
length
5000
0
5
5001
5
5
5002
10
4
5003
14
4
5010
23
5
5011
28
5
Offset value in each row is based on summation of offset and length of previous row.
As you can see, 6 rows have been deleted between forth and fifth rows and I need to update again offset column based on regular way. My desired output would be as follow:
Id
offset
length
5000
0
5
5001
5
5
5002
10
4
5003
14
4
5010
18
5
5011
23
5
Is there a pure update SQL statement to achieve this in sqlite?
I Appreciate any help.
If your version of SQLite is 3.33.0+ you can use the UPDATE ... FROM... syntax with SUM() window function:
UPDATE tablename AS t1
SET offset = t2.offset
FROM (
SELECT Id, SUM(length) OVER (ORDER BY Id ROWS BETWEEN UNBOUNDED PRECEDING AND 1 PRECEDING) offset
FROM tablename
) AS t2
WHERE t2.Id = t1.Id AND t2.offset IS NOT NULL;
See the demo.
For previous versions use a correlated subquery:
UPDATE tablename AS t1
SET offset = COALESCE(
(SELECT SUM(t2.length) FROM tablename t2 WHERE t2.Id < t1.Id),
t1.offset
);
See the demo.
I'm trying to group an age column into an age group column and summarize by that grouping.
ie I need the dataset below -
AGE
1
2
5
68
27
4
2
33
45
To become
AGE_GRP COUNT
1-10 5
11-20 0
21-30 1
31-40 1
40+ 2
I'm using R
Thanks.
You need CASE statement to split the AGE into different groups
SELECT CASE
WHEN AGE BETWEEN 1 AND 10 THEN '1-10'
WHEN AGE BETWEEN 11 AND 20 THEN '11-20'
WHEN AGE BETWEEN 21 AND 30 THEN '21-30'
WHEN AGE BETWEEN 31 AND 40 THEN '31-40'
ELSE '40+'
END AS AGE_GRP,
Count(1) as Cnt
FROM yourtable
GROUP BY CASE
WHEN AGE BETWEEN 1 AND 10 THEN '1-10'
WHEN AGE BETWEEN 11 AND 20 THEN '11-20'
WHEN AGE BETWEEN 21 AND 30 THEN '21-30'
WHEN AGE BETWEEN 31 AND 40 THEN '31-40'
ELSE '40+'
END
If you don't want to repeat the CASE statement in GROUP BY then use this
SELECT AGE_GRP,
Count(1) AS cnt
FROM (SELECT CASE
WHEN AGE BETWEEN 1 AND 10 THEN '1-10'
WHEN AGE BETWEEN 1 AND 10 THEN '11-20'
WHEN AGE BETWEEN 1 AND 10 THEN '21-30 '
WHEN AGE BETWEEN 1 AND 10 THEN '31-40'
ELSE '40+'
END AS AGE_GRP
FROM yourtable) A
GROUP BY AGE_GRP
You have zero values so you need a left join:
select agegrp, count(t.agegrp)
from (select '1-10' as agegrp, 1 as lowb, 10 as hib union all
select '11-20' as agegrp, 11, 20 union all
select '21-30' as agegrp, 21, 30 upperbound union all
select '31-40' as agegrp, 31, 40 as upperbound union all
select '40+' as agegrp, 41, NULL as upperbound
) ag left join
t
on t.age >= ag.lowb and t.age <= ag.hib
group by ag.agegrp
order by ag.lowb;
Note: this assumes the column is an integer, so a value like 30.5 isn't allowed. It is easy to adjust the query to handle non-integer ages, if that is the requirement.
In google BigQuery I have done a simple query to get how many music someone has listened.
What I need is to make a sum for all rows returned from the query below (some type of subquery)?
select count(1) cnt
from OF7.PETERV_TEST
where gender='F'
group by userId
Row f0_
1 14
2 1
3 7
4 18
5 1
6 4
7 2
8 2
expected result:
49
you can use:
SELECT sum(cnt)
FROM
(SELECT count(1) cnt
FROM OF7.PETERV_TEST
WHERE gender='F'
GROUP BY userId )
I have a stored procedure that counts data for each hour,
Declare #DateTimeToFilter DATETIME;
--set #DateTimeToFilter = GetDate();
set #DateTimeToFilter = '6/5/14'
SET NOCOUNT ON;
WITH H ([Hour]) AS
( SELECT 7 UNION
SELECT 8 UNION
SELECT 9 UNION
SELECT 10 UNION
SELECT 11 UNION
SELECT 12 UNION
SELECT 13 UNION
SELECT 14 UNION
SELECT 15 UNION
SELECT 16 UNION
SELECT 17 UNION
SELECT 18 UNION
SELECT 19
)
SELECT H.[Hour],
COUNT(T.BookingID) AS NoOfUsers
FROM H
LEFT JOIN tbl_Visitor T
ON H.[Hour] = DATEPART(HOUR, T.TimeofArrival) AND
((DATEDIFF(dd, T.TimeofArrival, #DateTimeToFilter) = 0) AND (DATEDIFF(mm, T.TimeofArrival, #DateTimeToFilter) = 0) AND
(DATEDIFF(yy, T.TimeofArrival, #DateTimeToFilter) = 0))
GROUP BY H.[Hour];
This forces the data returned for each hour irrespective of whether there is any data or not.
How could I add the half hourly data to be added also, so the returned data look like.
Hour Count
7 0
7.5 0
8 0
8.5 0
9 0
9.5 0
10 4
10.5 0
11 0
11.5 0
12 0
12.5 0
13 0
13.5 0
14 5
14.5 0
15 2
15.5 0
16 2
16.5 0
17 0
17.5 0
18 0
18.5 0
19 0
19.5 0
The data is stored in the database as a smalltimedate, i.e. 2014-06-05 14:00:00
Any help is appreciated.
You can use minutes instead of hours:
with h ([Minute]) as (
select 420 union all
select 450 union all
select 480 union all
select 510 union all
select 540 union all
...
Divide the minutes to get fractional hours:
select h.[Minute] / 60.0 as [Hour], ...
Calculate the start and stop time for the interval to filter the data:
... on T.TimeofArrival >= dateadd(minute, h.[Minute], #DateTimeToFilter) and
T.TimeofArrival < dateadd(minute, h.[Minute] + 30, #DateTimeToFilter)
Below is an example that groups by half-hour intervals and can easily be extended for other intervals. I suggest you avoid applying functions to columns in the WHERE clause as that prevents indexes on those columns from being used efficiently.
DECLARE
#DateTimeToFilter smalldatetime = '2014-06-05'
, #IntervalStartTime time = '07:00:00'
, #IntervalEndTime time = '20:00:00'
, #IntervalMinutes int = 30;
WITH
t4 AS (SELECT n FROM (VALUES(0),(0),(0),(0)) t(n))
, t256 AS (SELECT 0 AS n FROM t4 AS a CROSS JOIN t4 AS b CROSS JOIN t4 AS c CROSS JOIN t4 AS d)
, t64k AS (SELECT ROW_NUMBER() OVER (ORDER BY (a.n)) AS num FROM t256 AS a CROSS JOIN t256 AS b)
, intervals AS (SELECT DATEADD(minute, (num - 1) * #IntervalMinutes, #DateTimeToFilter) AS interval
FROM t64k
WHERE num <= 1440 / #IntervalMinutes)
SELECT
interval
, CAST(DATEDIFF(minute, #DateTimeToFilter, interval) / 60.0 AS decimal(3, 1)) AS Hour
, COUNT(T.BookingID) AS NoOfUsers
FROM intervals
LEFT JOIN dbo.tbl_Visitor T
ON T.TimeofArrival >= intervals.interval
AND T.TimeofArrival < DATEADD(minute, #IntervalMinutes, intervals.interval)
WHERE
interval >= DATEADD(minute, DATEDIFF(minute, '', #IntervalStartTime), #DateTimeToFilter)
AND interval < DATEADD(minute, DATEDIFF(minute, '', #IntervalEndTime), #DateTimeToFilter)
GROUP BY interval
ORDER BY Hour;
I am using oracle 11g and have written a stored procedure which stores values in temporary table as follows:
id count hour age range
-------------------------------------
0 5 10 61 10-200
1 6 20 61 10-200
2 7 15 61 10-200
5 9 5 61 201-300
7 10 25 61 201-300
0 5 10 62 10-20
1 6 20 62 10-20
2 7 15 62 10-20
5 9 5 62 21-30
1 8 6 62 21-30
7 10 25 62 21-30
10 15 30 62 31-40
now using this temp table i want to return two cursors. one for 61 and one for 62(age).
and for cursors there distinct range will be columns . for example cursor for age 62 should return following as dataset.
user 10-20 21-30 31-40
Count/hour count/hour count/hour
----------------------------------------------
0 5 10 - - - -
1 6 20 8 6 - -
2 7 15 - - - -
5 - - 9 5 - -
7 - - 10 25 - -
10 - - - - 15 30
this column range in temp table is is not a fixed values these are referenced from other table.
edited: i am using PIVOT for above problem, all examples i saw in internet are there for fixed values of column values (range in my case). how can i get dynamic values. following is the ex query:
SELECT *
FROM (SELECT column_2, column_1
FROM test_table)
PIVOT (SUM(column1) AS sum_values FOR (column_2) IN ('value1' AS a, 'value2' AS b, 'value3' AS c));
Instead of using handwritten value i am using following query inside 'IN'
SELECT * from(
with x as (
SELECT DISTINCT range
FROM test_table
WHERE age = 62 )
select ltrim( max( sys_connect_by_path(range, ','))
keep (dense_rank last order by curr),
',') range
from (select range,
row_number() over (order by range) as curr,
row_number() over (order by range) -1 as prev
from x)
connect by prev = PRIOR curr
start with curr = 1 )
it is giving error in this case. But when i using handwritten values its giving right output.
select * from (select user_id, nvl(count,0) count, nvl(hour,0) hour,nvl(range,0) range,nvl(age,0)
age from test_table)
PIVOT (SUM(count) as sum_count, sum(hour) as sum_hour for (range) IN
(
'10-20','21-30','31-40'
)
) where age = 62 order by userid
how can i give values dynamically there?
how can i do it.
Cursors are slow, I would recommend trying to do this in a query unless there's no alternative (or speed doesn't matter). You may want to look into: PIVOT / UNPIVOT which can rotate columns (in this case "range").
Here's some PIVOT / UNPIVOT documentation and examples:
http://www.oracle-developer.net/display.php?id=506
Based on your last edit:
Pretty sure you have two options:
Build dynamic sql based on the distinct values found in the "range" column.
You'll probably be stuck using a cursor again to build the column names but at least it will be limited to just the distinct ranges.
Oracle has a PIVOT XML command that you can use for this.
See: http://www.oracle.com/technetwork/articles/sql/11g-pivot-097235.html
And scroll down to the section: "XML Type"