create table examines( [e_id] [int] IDENTITY(1,1) NOT NULL, [dept_name] [nvarchar](200) NULL, [ph_score] [int] NULL)SELECT dept_name, A ...
create table examines( [e_id] [int] IDENTITY(1,1) NOT NULL, [dept_name] [nvarchar](200) NULL, [ph_score] [int] NULL)SELECT dept_name, AVG(sp) as '中位數'FROM( SELECT dept_name, cast(ph_score as decimal(5,2)) sp, ROW_NUMBER() OVER ( PARTITION BY dept_name ORDER BY ph_score ASC, e_id ASC) AS RowAsc, ROW_NUMBER() OVER ( PARTITION BY dept_name ORDER BY ph_score DESC, e_id DESC) AS RowDesc FROM examines SOH) xWHERE RowAsc IN (RowDesc, RowDesc - 1, RowDesc + 1)GROUP BY dept_nameORDER BY dept_name;select dept_name,STDEV(ph_score) as '標準差' from examines group by dept_nameselect dept_name,avg(ph_score) as '平均數' from examines group by dept_name
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原标题：SQL Server 中位数、标准差、平均数
关键词：sql
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