SQL多次计数，按月分组

我有一张桌子：

STATUS  DEFECT   DATE

CLOSED  IP       01.01.2012 
CLOSED  TV       03.03.2012
CLOSED  ADSL     05.05.2012
CLOSED  ADSL     11.01.2012 
CLOSED  TV       15.01.2012
NEW     TV         
NEW     TV

我想按月份对每个特定缺陷进行分组。被视为已关闭的状态

结果表I希望是：

MONTH     TV  ADSL  IP
January   1   1     1
March     1   0     0
May       0   1     0

我使用的是db2数据库，因此显示月份的部分是：

select case month(timestamp_iso(DATE))
        when 1 then 'January'
        when 2 then 'February'
        when 3 then 'March'
        when 4 then 'April'
        when 5 then 'May'
        when 6 then 'Jun'
        when 7 then 'July'
        when 8 then 'August'
        when 9 then 'September' 
        when 10 then 'October'
        when 11 then 'November'
        when 12 then 'December'
    end as Month

from TABLE
where  STATUS='CLOSED'
group by month(timestamp_iso(DATE))
order by month(timestamp_iso(DATE))

---

因此，我只需要添加这一部分进行计数。谢谢，您可以使用另一个case语句对缺陷类别进行计数，该语句将计数限制为一个类别中的缺陷：

select case month(timestamp_iso(DATE))
        when 1 then 'January'
        when 2 then 'February'
        when 3 then 'March'
        when 4 then 'April'
        when 5 then 'May'
        when 6 then 'Jun'
        when 7 then 'July'
        when 8 then 'August'
        when 9 then 'September' 
        when 10 then 'October'
        when 11 then 'November'
        when 12 then 'December'
    end as Month,
    count (case when defect = 'TV' then 1 end) TV,
    count (case when defect = 'ADSL' then 1 end) ADSL,
    count (case when defect = 'IP' then 1 end) IP
from TABLE
where  STATUS='CLOSED'
group by month(timestamp_iso(DATE))
order by month(timestamp_iso(DATE))

---

您可以使用另一个case语句对缺陷类别进行计数，该语句将计数限制为一个类别中的缺陷：

select case month(timestamp_iso(DATE))
        when 1 then 'January'
        when 2 then 'February'
        when 3 then 'March'
        when 4 then 'April'
        when 5 then 'May'
        when 6 then 'Jun'
        when 7 then 'July'
        when 8 then 'August'
        when 9 then 'September' 
        when 10 then 'October'
        when 11 then 'November'
        when 12 then 'December'
    end as Month,
    count (case when defect = 'TV' then 1 end) TV,
    count (case when defect = 'ADSL' then 1 end) ADSL,
    count (case when defect = 'IP' then 1 end) IP
from TABLE
where  STATUS='CLOSED'
group by month(timestamp_iso(DATE))
order by month(timestamp_iso(DATE))