Question

我想使用大小写时将列值分配给另一列。

在这里，我想将'CountAll'列分配给另一列。

我试图修复它，但它给了我一个错误，比如'无效的标识符'。需要你的帮助。

select cast(sysdate  as timestamp(0)) SAMPLE_TIME, SQL_ID, Count(*) as "CountAll", WAIT_TIME, WAIT_CLASS,
case when wait_time!=0 then 1 end as "CPU",
case when wait_time=0 and wait_class='Scheduler' then CountAll end as "Scheduler",
case when wait_time=0 and wait_class='User I/O' then Count1 end as "User I/O",
case when wait_time=0 and wait_class='System I/O' then Count1 end as "System I/O",
case when wait_time=0 and wait_class='Concurrency' then Count1 end as "Concurrency"
FROM  gv$session

Answer 1

我的猜测是你想要这样的东西：

select cast(sysdate  as timestamp(0)) as SAMPLE_TIME, SQL_ID,
       Count(*) as CountAll, 
       sum(case when wait_time <> 0 then 1 else 0 end) as "CPU",
       sum(case when wait_time = 0 and wait_class = 'Scheduler' then 1 else 0 end) as Scheduler,
       sum(case when wait_time = 0 and wait_class = 'User I/O' then 1 else 0 end) as "User I/O",
       sum(case when wait_time = 0 and wait_class = 'System I/O' then 1 else 0 end) as "System I/O",
       sum(case when wait_time = 0 and wait_class = 'Concurrency' then 1 else 0 end) as "Concurrency"
FROM gv$session
GROUP BY cast(sysdate  as timestamp(0)) as SAMPLE_TIME, SQL_ID;

将列值分配给另一列

1 个答案: