How to remove duplicates from table using SQL query

Question

I have a table which is as follows:

emp_name   emp_address  sex  matial_status  
uuuu       eee          m    s
iiii       iii          f    s
uuuu       eee         


        

Answer 1

It looks like all four column values are duplicated so you can do this -

select distinct emp_name, emp_address, sex, marital_status
from YourTable

However if marital status can be different and you have some other column based on which to choose (for eg you want latest record based on a column create_date) you can do this

select emp_name, emp_address, sex, marital_status
from YourTable a
where not exists (select 1 
                   from YourTable b
                  where b.emp_name = a.emp_name and
                        b.emp_address = a.emp_address and
                        b.sex = a.sex and
                        b.create_date >= a.create_date)