1）建立表
create table [dbo].[test] (
[id] [numeric](18, 0) identity (1, 1) not null primary key,
[name] [varchar] (200) collate chinese_prc_ci_as null ,
[remark] [varchar] (1024) collate chinese_prc_ci_as null ,
[step] [int] null
) go
2)插入資料
insert into test values('d','d',3)
insert into test values('d','d',3)
insert into test values('dk','dk',3)
insert into test values('dk','dk',3)
3）根據step刪除，如果name和remark一樣，就刪除小的記錄
delete from test where id not in (select max(id) from test group by name,remark,step) and step=3
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