What is the difference between "INNER JOIN" and "OUTER JOIN"?
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Inner Join
It is a specific kind of SQL join procedure. When two or more tables with at least one characteristic in common are merged, the procedure known as an inner join is performed. It won’t return anything if the tables don’t share any attributes.
Outer Join
It is a specific kind of SQL join procedure. Even if the join condition fails, an outer join operation will nevertheless return combined tuples from the given table.
In SQL, there are three different forms of outer joins:
- Left Outer Join
- Right Outer Join
- Full Outer Join
The primary distinction between an INNER JOIN and an OUTER JOIN is that the inner join retains just the information from both tables that is connected to each other (in the resulting table). An Outer Join, on the other hand, will maintain information in the resultant table that is unrelated to the original table.
