如何在SQL Server中显示没有重复的记录

Question

有谁知道我该如何显示在SQL Server结果中没有重复记录的记录？

Answer 1

使用不同

SELECT DISTINCT * FROM table

或者使用GROUP BY

select field1,field2,field3 FROM table GROUP BY field1, field2, field3

Answer 2

如果你真的意味着 “记录中没有重复的记录”，即每隔一行存在一次，只有一次，试试这个：

Select * From Table 
    Group By [Here list all columns in Table] 
    Having Count(*) = 1 

Answer 3

该问题的另一种解释。

SELECT * 
FROM yourtable t1 
WHERE NOT EXISTS 
     (SELECT * 
     FROM yourtable t2 
     WHERE t1.col_to_match_for_duplicates=t2.col_to_match_for_duplicates 
     AND  t1.primarykey    <> t2.primarykey 
     )