如何删除这些行

Question

我的表中的列这样

column1 column2 
100  1 
100  1 
101  2 
101  3 
102  4 
102  5 
103  6 
104  7 
104  7 

，我希望输出这样

column1 column2 
101  2 
101  3 
102  4 
102  5 
103  6 

Answer 1

如果你只是想要一个查询，而不重复返回行，你想：

SELECT DISTINCT column1, column2 
FROM MyTable 

如果实际上要删除的行，然后按照@A哈米德的链接a previous SO answer on deleting duplicate rows

Answer 2

显然，你只需要行其列2的值是您将只剩下你想要的行2和6

Delete from your_table 
Where column2<2 or column2>6 

现在之间

，你可以选择现在都：

Select column1, column2 
From yourtable 

Answer 3

declare @T table 
(
    c1 int, 
    c2 int 
) 

insert into @T values 
(100,  1), 
(100,  1), 
(101,  2), 
(101,  3), 
(102,  4), 
(102,  5), 
(103,  6), 
(104,  7), 
(104,  7) 

;with C as 
(
    select count(*) over(partition by C1, C2) as D 
    from @T 
) 
delete from C 
where D > 1