Age intervals as row statistics with SQL - sql

Question

I'm trying to create this summary statistic table, counting the number of individuals in each category
Agegroup | All | Female | Male
------------------------------------------------
All | 560594 | 34324 | 234244
< 20 | 4324 | 545 | 3456
20 - 30 | 76766 | 3424 | 32428
30 - 40 | 36766 | 764 | 82427
40 - 50 | 46766 | 4324 | 72422
50 - 60 | 66766 | 3424 | 52424
> 60 | 76766 | 43424 | 12423
from this table
PersonID | Age | Sex
----------------------------
A | 43 | F
B | 22 | F
C | 65 | M
D | 33 | F
E | 28 | M
Is this even possible "in one go" with SQL? I experimented with this, but it's not really coming together..
SELECT SUM(CASE WHEN Age < 20 THEN 1 ELSE 0 END) AS [Under 20],
SUM(CASE WHEN Age BETWEEN 20 AND 30 THEN 1 ELSE 0 END) AS [20-30],
SUM(CASE WHEN Age BETWEEN 30 AND 40 THEN 1 ELSE 0 END) AS [30-40]
FROM Persons

Answer 1

I believe the below is the simplest way to achieve this, and also get the row back even if there are no people within that age range. Also since Sex only has 2 possible values you can use NULLIF instead of the case expression.
SELECT [Agegroup] = Name,
[All] = COUNT(Person.PersonID),
[Female] = COUNT(NULLIF(Person.Sex, 'M')),
[Male] = COUNT(NULLIF(Person.Sex, 'F'))
FROM (VALUES
(0, 1000, 'All'),
(0, 20, '< 20'),
(20, 30, '20 - 30'),
(30, 40, '30 - 40'),
(40, 50, '40 - 40'),
(50, 60, '50 - 40'),
(60, 1000, '> 60')
) AgeRange (MinValue, MaxValue, Name)
LEFT JOIN Person
ON Person.Age >= AgeRange.MinValue
AND Person.Age < AgeRange.Maxvalue
GROUP BY AgeRange.Name, AgeRange.MinValue, AgeRange.Maxvalue
ORDER BY AgeRange.MinValue, AgeRange.MaxValue DESC
Example on SQL Fiddle

Answer 2

Maybe something like this:
DECLARE #T TABLE(PersonID VARCHAR(5), Age INT,Sex VARCHAR(5))
INSERT INTO #T
VALUES
('A',43,'F'),
('B',22 ,'F'),
('C ',65,'M'),
('D',33,'F'),
('E',28,'M')
SQL
SELECT
'All' AS Agegroup,
COUNT(*) AS [All],
SUM(CASE WHEN tbl.Sex='F' THEN 1 ELSE 0 END) AS Female,
SUM(CASE WHEN tbl.Sex='M' THEN 1 ELSE 0 END) AS Male
FROM
#T AS tbl
UNION ALL
SELECT
tbl.Agegroup,
COUNT(*) AS [All],
SUM(CASE WHEN tbl.Sex='F' THEN 1 ELSE 0 END) AS Female,
SUM(CASE WHEN tbl.Sex='M' THEN 1 ELSE 0 END) AS Male
FROM
(
SELECT
(
CASE
WHEN Age BETWEEN 0 and 20
THEN '< 20'
WHEN Age BETWEEN 20 and 30
THEN '20 - 30'
WHEN Age BETWEEN 30 and 40
THEN '30 - 40'
WHEN Age BETWEEN 40 and 50
THEN '40 - 50'
WHEN Age BETWEEN 50 and 60
THEN '50 - 60'
WHEN Age> 60
THEN '> 60'
END
) AS Agegroup,
t.Age,
t.Sex
FROM
#T AS t
) AS tbl
GROUP BY
tbl.Agegroup

Answer 3

Your best pattern would be to create an age range table (or virtual table as in the example below) and join to it, then pivot the results to get your results into a columnar form.
select range as AgeGroup, m as Male, F as Female, m+f as [all]
from
(
select PersonID, range, sex
from
(
select 'all' as range, 0 as minval, 200 as maxval
union select '<20',0,19
union select '20-29',20,29
-- etc....
) ranges
left join
yourtable t
on t.age between minval and maxval
) src
pivot
(count(personid) for sex in ([m],[f])) p

Answer 4

try this:
;with Age_range as(
select '<20' as age union all
select '20 - 30' as age union all
select '30 - 40' as age union all
select '40 - 50' as age union all
select '50 - 60' as age union all
select '>60' as age
),
cte as(
select [Sex],
sum(case when [Age]<20 then 1 else 0 end) as '<20' ,
sum(case when [Age]between 20 and 29 then 1 else 0 end) as '20 - 30',
sum(case when [Age]between 30 and 39 then 1 else 0 end) as '30 - 40',
sum(case when [Age]between 40 and 49 then 1 else 0 end) as '40 - 50',
sum(case when [Age]between 50 and 59 then 1 else 0 end) as '50 - 60',
sum(case when [Age]>=60 then 1 else 0 end) as '>60'
from Persons
group by [Sex]),
cte1 as(select Sex,'<20' as cnt from cte where [<20]>0 union all
select Sex,'20 - 30' as cnt from cte where [20 - 30]>0 union all
select Sex,'30 - 40' as cnt from cte where [30 - 40]>0 union all
select Sex,'40 - 50' as cnt from cte where [40 - 50]>0 union all
select Sex,'50 - 60' as cnt from cte where [50 - 60]>0 union all
select Sex,'>60' as cnt from cte where [>60]>0)
select A.age,
COUNT(case when sex in ('M','F') then 1 end) as [All],
COUNT(case when sex='F' then 1 end) as Female,
COUNT(case when sex='M' then 1 end) as Male
from Age_range A left join cte1 C
on A.age=C.cnt
group by A.age
SQL Fiddle Demo

Answer 5

select 'All' as [Age Group]
. count(*) as [All],
, sum(case Sex when 'F' then 1 end) as Female
, sum(case Sex when 'M' then 1 end) as Male
from Persons
union all
select '< 20' as [Age Group]
. count(*) as [All],
, sum(case Sex when 'F' then 1 end) as Female
, sum(case Sex when 'M' then 1 end) as Male
from Persons
where Age < 20
union all
select '20 - 30' as [Age Group]
. count(*) as [All],
, sum(case Sex when 'F' then 1 end) as Female
, sum(case Sex when 'M' then 1 end) as Male
from Persons
where 20 <= Age and Age < 30
union all
...