oracle数据库sql窗口输入L键自动关闭整个数据库客户端，求高手解答
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oracle数据库sql窗口输入L键自动关闭整个数据库客户端
--1
select median (sales) from total_sales
--2
select avg(sales)
from (select row_number() over(order by sales) as rn, name, sales from total_sales) t,
(select count(*) / 2 as mid_c from total_sales) b
where rn = b.mid_c
or rn = trunc (b.mid_c+1)
--1
select median (sales) from total_sales
--2
select avg(sales)
from (select row_number() over(order by sales) as rn, name, sales from total_sales) t,
(select count(*) / 2 as mid_c from total_sales) b
where rn = b.mid_c
or rn = trunc (b.mid_c+1)
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