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What is self join in SQL

An SQL join clause - corresponding to a join operation in relational algebra - combines columns from one or more tables in a relational database . We know about inner join , left join , natural join etc in SQL . But most of them don’t know what is self join and how does it work ? Now we are going to know what is self join and how does it work . We can use a self join when a table references data in itself. To clearly understand see the following table . See , This is our Employee table and we have to find out who works under the manager . Here Sonam is the manager and Rahul a... Read more

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