What is Inner Join?
Inner join is a very important term that belongs to the SQL family. It is a join-in SQL server that merges tuples between two or more tables where one attribute should be in common. This join is based on a rational relationship between the tables, and is used to fetch data that is present in both tables.
What is Outer Join?
An outer join is used to return results by merging rows from two or more tables. The outer join will return every row from one defined table, even if the join state fails.
Difference between Inner Join and Outer Join
| S.No | Inner Join | Outer Join |
|---|---|---|
| 1. | It replaces the merged tuple between two or more tables. | It replaces the merged tuple from a particular table even if the join condition fails. |
| 2. | In the case of inner join, if the attributes are not the same, it will not return anything. | In outer join, there is no common attribute. If the attribute is blank, it will be considered NULL. |
| 3. | The inner join is faster than the outer join. | In general, the outer join is slow as compared to the inner join. |
| 4. | We perform this operation to fetch the information about any particular attribute. | We perform this operation to fetch the complete information. |
| 5. | SQL Syntax:
select * from table1 INNER JOIN / JOIN table2 ON table1.column_name = table2.column_name; |
SQL Syntax:
select * from table1 LEFT OUTER JOIN / RIGHT OUTER JOIN / FULL OUTER JOIN / FULL JOIN table2 ON table1.column_name = table2.column_name; |
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