表employee(empid,birthday)
部分資料:
empid birthday
1 1964-3-2
2 1980-5-9
3 1972-9-30
....
想得到按年齡段的人數,比如說20-30歲的員工數,30-40歲的員工數,40-50歲的員工數,50歲以上的員工數
即由員工表得到以下的統計資料
agelevel count
20-30 30
30-40 5
40-50 8
50歲以上 7
怎樣寫這條語句?
語句如下：：
select n'agelevel'=(case((datediff(year,birthday,getdate())-1)/10) when 2 then '21－30' when 3 then '31－40' when 4 then'41－50' else '50以上' end),
count(*) as count
from
employee
group by (case((datediff(year,birthday,getdate())-1)/10) when 2 then '21－30' when 3 then '31－40' when 4 then'41－50' else '50以上' end )
或者以10歲為遞增
select
cast(f1*10+1 as varchar(3))+'-'+cast(f1*10+10 as varchar(3)) as 年齡段,f2 as 人數
from
(select datediff(d,a0111,getdate())/365/10 as f1,
count(*) as f2
from dbo.a001
group by datediff(d,a0111,getdate())/365/10) a
order by cast(f1*10+1 as varchar(3))+'-'+cast(f1*10+10 as varchar(3))
第二種形式
16-20 21-30 31-40 41-50 51-60 61-70
0 8 9 8 5 3
select
sum(
case when datediff(year, a0111, getdate()) between 16 and 20 then 1 else 0 end) as '16-20',
sum(case when datediff(year, a0111, getdate()) between 21 and 30 then 1 else 0 end) as '21-30',
sum(case when datediff(year, a0111, getdate()) between 31 and 40 then 1 else 0 end) as '31-40',
sum(case when datediff(year, a0111, getdate()) between 41 and 50 then 1 else 0 end) as '41-50',
sum(case when datediff(year, a0111, getdate()) between 51 and 60 then 1 else 0 end) as '51-60',
sum(case when datediff(year, a0111, getdate()) between 61 and 70 then 1 else 0 end) as '61-70'
from
dbo.a001
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