DB2 按月分组并使用多个 where 子句计数
DB2 group by month and count with multiple where clauses
我有以下 DB2 table 命名为 INCIDENT
ticketid Createdon Severity
1 2012-01-01 1
2 2012-01-10 2
3 2012-01-15 2
4 2012-01-20 3
5 2012-01-29 3
6 2012-02-06 3
7 2012-02-15 3
8 2012-02-20 3
9 2012-02-20 4
10 2012-02-21 3
我想要得到的结果：
Month Sev1 Sev2 Sev3 Sev4
====================================
2012-01 1 2 2 0
2012-02 0 0 4 1
到目前为止我有这个：
select to_char(INCIDENT.CREATEDON, 'YYYY-MM') as month,
count(case when severity = 1 then 1 else 0 end) as SEV1,
count(case when severity = 2 then 1 else 0 end) as SEV2
from INCIDENT group by to_char(INCIDENT.CREATEDON,'YYYY-MM')
但这给了我两列中的所有事件...
Month Sev1 Sev2 Sev3 Sev4
====================================
2012-01 11 11 11 11
2012-02 16 16 16 16
我没有得到什么概念？我认为这是可行的，但我不能全神贯注...
我明白了！当然，我在发布问题后想通了....
select to_char(INCIDENT.CREATEDON, 'YYYY-MM') as month,
sum(case when severity = 1 then 1 else 0 end) as sev1,
sum(case when severity = 2 then 1 else 0 end) as sev2,
sum(case when severity = 3 then 1 else 0 end) as sev3,
sum(case when severity = 4 then 1 else 0 end) as sev4
from INCIDENT
where (createdon >= current_timestamp - (minute(current_timestamp) minute) - (hour(current_timestamp) -1) hours - ( day(current_date) - 1 ) days - 13 month ) group by to_char(INCIDENT.CREATEDON,'YYYY-MM')
我有以下 DB2 table 命名为 INCIDENT
ticketid Createdon Severity
1 2012-01-01 1
2 2012-01-10 2
3 2012-01-15 2
4 2012-01-20 3
5 2012-01-29 3
6 2012-02-06 3
7 2012-02-15 3
8 2012-02-20 3
9 2012-02-20 4
10 2012-02-21 3
我想要得到的结果：
Month Sev1 Sev2 Sev3 Sev4
====================================
2012-01 1 2 2 0
2012-02 0 0 4 1
到目前为止我有这个：
select to_char(INCIDENT.CREATEDON, 'YYYY-MM') as month,
count(case when severity = 1 then 1 else 0 end) as SEV1,
count(case when severity = 2 then 1 else 0 end) as SEV2
from INCIDENT group by to_char(INCIDENT.CREATEDON,'YYYY-MM')
但这给了我两列中的所有事件...
Month Sev1 Sev2 Sev3 Sev4
====================================
2012-01 11 11 11 11
2012-02 16 16 16 16
我没有得到什么概念？我认为这是可行的，但我不能全神贯注...
我明白了！当然，我在发布问题后想通了....
select to_char(INCIDENT.CREATEDON, 'YYYY-MM') as month,
sum(case when severity = 1 then 1 else 0 end) as sev1,
sum(case when severity = 2 then 1 else 0 end) as sev2,
sum(case when severity = 3 then 1 else 0 end) as sev3,
sum(case when severity = 4 then 1 else 0 end) as sev4
from INCIDENT
where (createdon >= current_timestamp - (minute(current_timestamp) minute) - (hour(current_timestamp) -1) hours - ( day(current_date) - 1 ) days - 13 month ) group by to_char(INCIDENT.CREATEDON,'YYYY-MM')