在sql中查找重複的行

Question

我想查找通過SQL在整行中是否有重複的重複項。如何在這裏找到具有重複像

所有值2行

數據集

id employee_name  dept Dept_name 
1 Abhijit   10 Physics 
1 Abhijit   10 Physics 
2 Debjit   20 Chemis 
3 partha   30 Maths 

結果集

id employee_name  dept Dept_name 
1 Abhijit   10 Physics 
1 Abhijit   10 Physics 

Answer 1

可以使用具有COUNT（*）> 1組您的cols

select id, employee_name , dept, Dept_name 
from my_table 
group by id, employee_name , dept, Dept_name 
having count(*) > 1 

Answer 2

通過簡單組和having子句

Select id, employee_name, dept, dept_name 
From your_table 
Group by id, employee_name, dept, dept_name 
Having count(*) > 1; 

基於計數過濾

Answer 3

Self join

SELECT a.* from employees a, employees b WHERE a.id = b.id and a.employee_name = b.employee_name and a.dept = b.dept; 

DEPT_NAME可能它同樣具有相同ID的DEPS，所以沒必要將其包含在where子句