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about join

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about join..

Answer / mala yadav

select command is used to fetch the result from the table ,
but of u want the combine results from more than 1 table
then in this case we use JOINS rather than a single table
select statement.

In joins u can join upto 2 to 61 tables to get tha required
result.

joins are of 5 types
- inner join
- self join
- cross join
- left outer join
- right outer join

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about join..

Answer / vishal

if u donot know join means u always working in one table but
always single table is not enough to give the result than
comes the concept of joins in which two table we join must
have a column same on the basis of the table are join. join
are of various type such as left outer, right outer ,inner
join etc

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