CODEWITHSUNDEEP
mysqlsql
NemoStein
NemoStein

Reputation: 2098

How to select the count of values grouped by ranges

Hail, Stack!

I need to select the count of values grouped by ranges.

To exemplify, suppose that I have the following values in a table columm: 1,2,4,5,6,8,9,11,13,16

Then, I want to retreave the count of them in ranges of 5, like this:

From  0 to  4 there is 3 values (1,2,4)
From  5 to  9 there is 4 values (5,6,8,9)
From 10 to 14 there is 2 values (11,13)
From 15 to 19 there is 1 values (16)

And so on...

How can I make this in a query?

Upvotes: 7

Views: 9502

Answers (5)

kgu87
kgu87

Reputation: 17

select
val / 5 as grp,
case val / 5
when 0 then ' 0 to  5'
when 1 then ' 5 to 10'
when 2 then '10 to 15'
when 3 then '15 to 20'
end
as grpname,
count(distinct val) as cnt
from
(
select 1  as val
union select 2  
union select 4
union select 5
union select 6
union select 8
union select 9
union select 11
union select 13
union select 16
) a
group by 
val / 5

Upvotes: 0

Josef Pfleger
Josef Pfleger

Reputation: 74557

Maybe this is what you want:

SELECT
    5 * (n div 5) as 'from',
    5 * (n div 5) + 4 as 'to',
    COUNT(*)
FROM yourtable
GROUP BY n div 5;

For your sample this query gives you

+------+------+----------+
| from | to   | count(*) |
+------+------+----------+
|    0 |    4 |        3 |
|    5 |    9 |        4 |
|   10 |   14 |        2 |
|   15 |   19 |        1 |
+------+------+----------+
4 rows in set (0.00 sec)

Upvotes: 16

Shad
Shad

Reputation: 15481

How about

for(i=MIN_OF_TABLE-1;i<=MAX_OF_TABLE;$i+=RANGE){
    SELECT COUNT(`VALUE`),GROUP_CONCAT(`VALUE`) FROM `TABLE` WHERE `VALUE`>i AND `VALUE`<=i+RANGE;
}

This will fetch rows containing the information you displayed in rows =)

Upvotes: 0

Andomar
Andomar

Reputation: 238296

One way is the sum + case approach:

select  sum(case when col1 between 0 and 4 then 1 end)
,       sum(case when col1 between 5 and 9 then 1 end)
,       sum(case when col1 between 10 and 14 then 1 end)
...
from    YourTable

Another approach is to have a range table, filled like:

start    end
0        4
5        9
10       14

Then you can:

select  r.start
,       r.end
,       count(case when yt.col1 between r.start and r.end then 1 end)
from    YourTable yt
cross join
        RangeTable r
group by
        r.start
,       r.end

Upvotes: 3

Guffa
Guffa

Reputation: 700910

Calculate a value that you can group on. In this case you just have to divide the value by 5 to get that result:

select value / 5 as Group, count(*) as Cnt
from TheTable
group by value / 5

This will give you are result like this:

Group  Cnt
0      3
1      4
2      2
3      1

Upvotes: 2

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