oracle一个性能优化的sql.该怎么处理
日期：2014-05-17 浏览次数：20754 次
oracle一个性能优化的sql...
有一个sql语句想优化下，看过很多文章说不用in，可是不知道该如何修改：
select work.Id from table01 as work where (work.Id = 01
or work.workId in (select p.workId from table02 as p
where p.PId=01)) and work.isDel<>1 and work.workDate between ? and ?
order by work.workDate,work.beginTime;
我创建了一个索引 字段是 workDate。其他的方式该怎么搞？能不能用视图，怎么用啊？....
------解决方案--------------------
有一个sql语句想优化下，看过很多文章说不用in，可是不知道该如何修改：
select work.Id from table01 as work where (work.Id = 01
or work.workId in (select p.workId from table02 as p
where p.PId=01)) and work.isDel<>1 and work.workDate between ? and ?
order by work.workDate,work.beginTime;
我创建了一个索引 字段是 workDate。其他的方式该怎么搞？能不能用视图，怎么用啊？....
------解决方案--------------------
- SQL code
(work.Id = 01 or work.workId in (select p.workId from table02 as p where p.PId=01))
------解决方案--------------------
select work.Id,work.workDate,work.beginTime
from table01 as work
where work.Id = 01
and work.isDel<>1
and work.workDate between ? and ?
union all
select work.Id,work.workDate,work.beginTime
from table01 as work,table02 as p
where p.PId=01 and work.workId = p.workId
and work.isDel<>1 and work.workDate between ? and ?
order by workDate,beginTime;
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