Oracle Database 12c Row Limiting Clause
In Database 12c, to limit the number of rows in a query can be simplified by ANSI fetch first/offset keyword via Oracle SQL row limiting clause.
在Database 12c裏，通過Oracle SQL 行限制子句來限制一個查詢的行數能夠用ANSI的 fetch
first/offset 關鍵字簡化了.
For example, fetch the top 3 "oldest" employees:
例如,獲取"最老"的前3名員工
select *
from employees
order by hire_date
fetch first 3 rowsonly;
And, keep the ties:
保持連結
select *
from employees
order by hire_date
fetch first 3 rows with ties;
Or skip the first 3 employees, what we need is rank 4 to 6:
或者跳過前3名員工,我們需要的是排在第4到6的:
select *
from employees
order by hire_date
offset 3 rows
fetch next 3 rows only;
May be limiting row count is way too precise, percentage style is preferred sometime =)
或者限制行數這種方法太準確了,有時更偏向於百分數類型
select *
from employees
order by hire_date
fetch first 10 percent rows only;
Todd