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  • Joins In SQL

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    Joins

    There are different type of joins in SQL

    1.Inner Join-Return all the values if there is a match in both the table.

    2.Outer join

    -left outer join-Return all the values from left table and the values matched from the right table.

    -right outer join-Return all the values from the right table and the values matched from the left table.

    3.Self join-In this we divide a single table to different table using alias and join them it behave as the two tables but actually is one.

    Inner join

    SELECT column_name(s)
    FROM table1
    INNER JOIN table2
    ON table1.column_name=table2.column_name;
    

    Left outer join

    SELECT column_name(s)
    FROM table1
    LEFT JOIN table2
    ON table1.column_name=table2.column_name;
    

    Right outer join

    SELECT column_name(s)
    FROM table1
    RIGHT JOIN table2
    ON table1.column_name=table2.column_name;
    

    Self join

    SELECT e1.employee_name
    FROM employee e1, employee e2
    WHERE e1.employee_location = e2.employee_location
    AND e2.employee_name="Joe";
    

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