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What is self join. please explain me?

In which scenario we use self join.It is similar to inner join ?

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تم إضافة السؤال من قبل Julfkar Moh Umar , Sr. Software Engineer , Aakash Edutech Private Limited
تاريخ النشر: 2016/01/10
Micheal Bright
من قبل Micheal Bright , Food And Beverage Supervisor , Stiefel A Gsk Company - Pakistan

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Gayasuddin Mohammed
من قبل Gayasuddin Mohammed , Advocate , Practicing Law before High Court at Hyderabad

self join is where you have a requirement of the fields of the same table had to be compare to get the desired results.

query something like  select f1, f2, f3 from Table1 t1, Table1 t2 where t1.field = t2.field.

the best example to understand the concept is, sql plus's Employee table with regard to Manager and employee concept.

Thanks.

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