Question

我有超过3000行的重复数据，我基本上需要删除Env_ID ='1'中的重复数据，但我首先需要检查是否有一些Env_id = '1'的数据行与之相比没有重复Env_ID ='4'

这是否清楚？有人可以帮忙吗？

Answer 1

这就是：

架构：

create table TableName 
( Source_ID varchar(100) not null,
 Env_ID varchar(100) not null,
 Record_ID  varchar(100),
 Item_Number varchar(100) not null, 
 Item_Description varchar(100), 
 Item_Class varchar(100)
)
alter table TableName add constraint PK_Env primary key (Env_ID, Source_ID, Item_Number)

insert into TableName (Source_ID,
                   Env_ID, 
                   Record_ID, 
                   Item_Number, 
                   Item_Description,
                   Item_Class)
values ('1','1','IM','0010000500K2#TI', 'BOLA B.1.6".5-1AC','KA')

insert into TableName (Source_ID,
                   Env_ID, 
                   Record_ID, 
                   Item_Number, 
                   Item_Description,
                   Item_Class)
values ('1','4','IM','0010000500K2#TI', 'BOLA B.1.6".5-1AC','KA')

解决方案来自：How can I remove duplicate rows?

;WITH cte
 AS (SELECT ROW_NUMBER() OVER (PARTITION BY Source_ID, Record_ID, Item_Number, Item_Description, Item_Class
                                   ORDER BY (Env_ID) desc) RN
     FROM   TableName WHERE Env_ID = '1' or Env_ID = '4')
DELETE FROM cte
WHERE  RN > 1

它检查所有字段但是Env_ID。希望它有所帮助，下次请：https://stackoverflow.com/help/how-to-ask

SQL查询 - 需要挑出不重复的行

1 个答案: