Hi All,
Could someone explain to me which one is best in the following two queries
w.r.t performance?
Thanks
Sami
Query1)
========
select distinct empployee_id from employees where department_id=10 or
department_id=20
/
Query2)
=======
select employee_id from employees where department_id=10
union
select employee_id from employees where department_id=20
/
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