處理某分組列值有重複時，只顯示分組的首行列值

if not object_id('[tb]') is null

drop table [tb]

gocreate table [tb]([chuanming] nvarchar(10),[huoming] nvarchar(10))

insert [tb]

select n'東方',n'乙烯' union all

select n'東方',n'笨' union all

select n'東方',n'甲烷' union all

select n'東方',n'碳' union all

select n'東方',n'石化' union all

select n'海欣',n'乙烯' union all

select n'海欣',n'笨' union all

select n'海欣',n'甲烷' union all

select n'海欣',n'碳' union all

select n'海欣',n'石化'

go--select * from [tb]

-->sql查詢如下:

--1.2000/2005通用

select case when [huoming]=(select top 1 [huoming] from tb where [chuanming]=t.[chuanming])

then [chuanming] else ''

end [chuanming],

[huoming]

from tb t

--2.2005以上用

select case row_number()over(partition by [chuanming] order by getdate()) when 1

then [chuanming] else ''

end [chuanming],

[huoming]

from tb t

chuanming  huoming

東方       乙烯笨甲烷

碳石化海欣       乙烯笨甲烷

碳石化(10 行受影響)

處理某分組列值有重複時，只顯示分組的首行列值

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