Recursive query problem

i have a table which contains the following fields

•Supervisorid •Empid This is just like a referral program. A guy can refer 3 guys under him i.e, 3 is referring three guys namely 4 5 8 similarly 4 is referring 9 10 and 11 likewise 8 is referring 12, 13 it goes like this..

I want a query to get all EmpId under Supervisor 3
 
Recursive query problem
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i have a table which contains the following fields

•Supervisorid •Empid This is just like a referral program. A guy can refer 3 guys under him i.e, 3 is referring three guys namely 4 5 8 similarly 4 is referring 9 10 and 11 likewise 8 is referring 12, 13 it goes like this..

I want a query to get all EmpId under Supervisor 3
 