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中位数的sql

发布时间: 2023-05-03 07:39:17

❶ oracle数据库中中位数用sql的求法。菜鸟求高手解答

--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)

❷ 我想找SQL中位数最多最大的ID

你的id字段是varchar类型的吧?
位数是用len函数,比如:Select len('123')等于3

应该如果id全是数字,可以用:select max(cast(id as int)) from 表

❸ sql怎么计算中位数

众数:count()行数后取max值
平均数:avg()
中位数:(max()+min())/2

❹ impala sql如何取中位数

中位数函数:percentile

近似中位数函数:percentile_approx

转载于网页链接

❺ 在MySQL中,如何同时计算多组数据的中位数

有点复杂,在你基础上绝袜加了条有奇数的数据

创建表,插入数据:

createtabletest
(cat_idint,
priceint);

insertintotestvalues(101,90);
insertintotestvalues(101,99);
insertintotestvalues(102,98);
insertintotestvalues(103,96);
insertintotestvalues(102,95);
insertintotestvalues(102,94);
insertintotestvalues(102,93);
insertintotestvalues(103,99);
insertintotestvalues(103,98);
insertintotestvalues(103,97);
insertintotestvalues(104,96);
insertintotestvalues(104,95);
insertinto模宏掘test旦核values(105,97);
insertintotestvalues(105,96);
insertintotestvalues(105,95);

执行:

SELECT
t1.cat_id,
round(avg(t1.price),1)price
FROM
(
SELECT
*
FROM
(
SELECT
t.cat_id,
t.price,
count(*)ASrank
FROM
testt
LEFTOUTERJOINtestrONt.cat_id=r.cat_id
ANDt.price<=r.price
GROUPBY
t.cat_id,
t.price
ORDERBY
t.cat_id,
t.priceDESC
)s
)t1,
(
SELECTDISTINCT
a.cat_id,
round(a.maxrank/2)rank
FROM
(
SELECT
cat_id,
max(rank)maxrank,
MOD(max(rank),2)modrank
FROM
(
SELECT
*
FROM
(
SELECT
t.cat_id,
t.price,
count(*)ASrank
FROM
testt
LEFTOUTERJOINtestrONt.cat_id=r.cat_id
ANDt.price<=r.price
GROUPBY
t.cat_id,
t.price
ORDERBY
t.cat_id,
t.priceDESC
)s
)t1
GROUPBY
cat_id
)a,
(
SELECT
*
FROM
(
SELECT
t.cat_id,
t.price,
count(*)ASrank
FROM
testt
LEFTOUTERJOINtestrONt.cat_id=r.cat_id
ANDt.price<=r.price
GROUPBY
t.cat_id,
t.price
ORDERBY
t.cat_id,
t.priceDESC
)s
)b
WHERE
a.cat_id=b.cat_id
ANDa.modrank=0
UNIONALL
SELECTDISTINCT
a.cat_id,
round(a.maxrank/2)+1rank
FROM
(
SELECT
cat_id,
max(rank)maxrank,
MOD(max(rank),2)modrank
FROM
(
SELECT
*
FROM
(
SELECT
t.cat_id,
t.price,
count(*)ASrank
FROM
testt
LEFTOUTERJOINtestrONt.cat_id=r.cat_id
ANDt.price<=r.price
GROUPBY
t.cat_id,
t.price
ORDERBY
t.cat_id,
t.priceDESC
)s
)t1
GROUPBY
cat_id
)a,
(
SELECT
*
FROM
(
SELECT
t.cat_id,
t.price,
count(*)ASrank
FROM
testt
LEFTOUTERJOINtestrONt.cat_id=r.cat_id
ANDt.price<=r.price
GROUPBY
t.cat_id,
t.price
ORDERBY
t.cat_id,
t.priceDESC
)s
)b
WHERE
a.cat_id=b.cat_id
ANDa.modrank=0
UNIONALL
SELECTDISTINCT
a.cat_id,
round(a.maxrank/2)rank
FROM
(
SELECT
cat_id,
max(rank)maxrank,
MOD(max(rank),2)modrank
FROM
(
SELECT
*
FROM
(
SELECT
t.cat_id,
t.price,
count(*)ASrank
FROM
testt
LEFTOUTERJOINtestrONt.cat_id=r.cat_id
ANDt.price<=r.price
GROUPBY
t.cat_id,
t.price
ORDERBY
t.cat_id,
t.priceDESC
)s
)t1
GROUPBY
cat_id
)a,
(
SELECT
*
FROM
(
SELECT
t.cat_id,
t.price,
count(*)ASrank
FROM
testt
LEFTOUTERJOINtestrONt.cat_id=r.cat_id
ANDt.price<=r.price
GROUPBY
t.cat_id,
t.price
ORDERBY
t.cat_id,
t.priceDESC
)s
)b
WHERE
a.cat_id=b.cat_id
ANDa.modrank=1
)t2
WHERE
t1.cat_id=t2.cat_id
ANDt1.rank=t2.rank
GROUPBY
t1.cat_id

结果:

select*from(
selectt.cat_id,t.price,count(*)asrankfromtestt
LEFTOUTERJOINtestr
ont.cat_id=r.cat_id
andt.price<=r.price
groupbyt.cat_id,t.price
orderbyt.cat_id,t.pricedesc
)s

这条是主语句,主要是按照大小给出一个排名,然后根据中位数的公式,偶数的话,取最中间两个的平均数,奇数取最中间的数。自己研究一下吧。

❻ 如何使用简单的SQL查询在MySQL中计算中位数

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❼ SQL 2008中位数怎么求

declare @str varchar(100)
set @str='1,2,3,4,5,6,7,8,9,0'
select len(@str)

❽ SQL语句分组求中位数。数据和所需结果如图。

select ppid,ycljh,avg(jp) as jp from table
group by ppid,ycljh

❾ SQL + ORACLE + 中位数 在线等

create proc test1
as
declare @a int
select @a=count(*) from m
if @a%2=1
begin
select xm from (select xm,zkzh,count(*) k from(select i.xm,i.zkzh from m i ,m where i.xm>=m.xm)as l group by xm,zkzh )as q where k=((@a+1)/2)
end
if @a%2=0
begin
select avg(xm) xm from (select xm,zkzh,count(*) k from(select i.xm,i.zkzh from m i ,m where i.xm>=m.xm)as l group by xm,zkzh )as q where k in(@a/2,(@a+2)/2)
end
go

haiyoudian wenti.....

❿ 各位大侠,在oracle的sql中有一个取中间值的聚合函数,老师课件里写的是media,我试了,不行啊,求解!

那个函脊渣数的名字, 叫 "中位数"
中位数Median

SELECT
course_name,
Median(grade) AS "中位数",
AVG(grade) AS "平均数"
FROM
test_course
GROUP BY
course_name;

COURSE_NAM 中位李瞎数 平均数
---------- ---------- ----------
数樱扰悄学 70 71
语文 72.5 72.5