How I will find the duplicate rows count from employee table in Oracle 9i

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Oracle 9i
How can I find the duplicate rows count from employee table in Oracle 9i?

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You could use a select statement like the following, to find out what employees exist more than once:

select emp_id, count(*)
from employee
group by emp_id
having count(*) > 1;

If you want to count the duplicate employees, you could do something like:

select count(*) from (
select emp_id, count(*)
from employee
group by emp_id
having count(*) > 1);

Here I’m assuming that an emp_id is the field used to identify an employee, but you can replace it but other field(s) as needed.

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  • Brijesh
    SELECT criteria field,COUNT(*) FROM table GROUP BY criteria field
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