在Oracle 10g中,没有PIVOT
功能,但你可以使用聚合与CASE
复制它:
select usr,
sum(case when tp ='T1' then cnt else 0 end) T1,
sum(case when tp ='T2' then cnt else 0 end) T2,
sum(case when tp ='T3' then cnt else 0 end) T3
from temp
group by usr;
见SQL Fiddle with Demo
如果你的Oracle 11g +,那么你可以使用PIVOT
功能:
select *
from temp
pivot
(
sum(cnt)
for tp in ('T1', 'T2', 'T3')
) piv
见SQL Fiddle with Demo
如果你有一个未知的数值进行改造的,那么你可以创建一个过程来产生这个动态的版本:
CREATE OR REPLACE procedure dynamic_pivot(p_cursor in out sys_refcursor)
as
sql_query varchar2(1000) := 'select usr ';
begin
for x in (select distinct tp from temp order by 1)
loop
sql_query := sql_query ||
' , sum(case when tp = '''||x.tp||''' then cnt else 0 end) as '||x.tp;
dbms_output.put_line(sql_query);
end loop;
sql_query := sql_query || ' from temp group by usr';
open p_cursor for sql_query;
end;
/
然后执行该代码:
variable x refcursor
exec dynamic_pivot(:x)
print x
结果所有版本是相同的:
| USR | T1 | T2 | T3 |
----------------------
| 1 | 17 | 0 | 0 |
| 2 | 0 | 21 | 1 |
| 3 | 45 | 0 | 0 |
编辑:基于您的评论,如果你想有一个Total
˚F ield,最简单的方法是将查询放置另一个SELECT
类似这样的内部:
select usr,
T1 + T2 + T3 as Total,
T1,
T2,
T3
from
(
select usr,
sum(case when tp ='T1' then cnt else 0 end) T1,
sum(case when tp ='T2' then cnt else 0 end) T2,
sum(case when tp ='T3' then cnt else 0 end) T3
from temp
group by usr
) src;
见SQL Fiddle with Demo
不知道如何做到这一点 – F11
你需要给出一个更明显的例子你的结果应与样本表一致。 –
@JoachimIsaksson请查看编辑问题 – F11