sqlserver 行转列例子

代码如下：

create proc [dbo].[getTimeStatusFromTaskLog]
as
--首先将临时表清空
delete from [TEMP_TASK_LOG_STEP1]
delete from [TEMP_TASK_LOG_STEP2]
--先将所有的任务的前三条外呼记录行转换成列
insert into [TEMP_TASK_LOG_STEP1]
select taskid,
case when CALL_SEQ='2' then ENDTIME end as  'firstTime',
case when CALL_SEQ='2' then operflag end as  'firstStatus',
case when CALL_SEQ='3' then ENDTIME end as  'secondTime',
case when CALL_SEQ='3' then operflag end as  'secondStatus',
case when CALL_SEQ='4' then ENDTIME end as  'thirdTime',
case when CALL_SEQ='4' then operflag end as  'thirdStatus'
from T_QUESTIONNAIRE_TASK_LOG

--将三行合并成一行,往临时表中填数据，让外面的表左外连接用
insert into [TEMP_TASK_LOG_STEP2]
select taskid,MAX(firstTime) as 'firsttime',MAX(firstStatus) as 'firstStatus',
MAX(secondTime) as 'secondtime',MAX(secondStatus) as 'secondStatus',
MAX(thirdTime) as 'thirdtime',MAX(thirdStatus) as 'thirdStatus'
from [TEMP_TASK_LOG_STEP1] group by taskid

 

一般行转列都会找到一些固定的列。比如此例子中的CALL_SEQ的值，就是2、3、4的固定值。

refurl:http://www.cnblogs.com/kerrycode/archive/2010/07/28/1786547.html

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