Joins are used to combine rows from two or more tables, and there are two types: Oracle joins which include invalid, equi, non-equi, self and outer joins. SQL joins include cross, natural, using clause, on clause, left outer, right outer and full outer joins.

1. Joins
Joins are two types
ORACLE JOIN
• Invalid join
• Equi join
• Non Equi join
• Self join
• Outer join
SQL JOIN
• Cross join
• Natural join
• Using clause
• On clause
• Left outer join
• Right outer join
• Full outer join
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