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  • SQL Joins

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    Joins

    Joins in SQL are nothing but a technique to join the two table based on a common field.

    OrderID     CustomerID  OrderDate
    10308           2      1996-09-18
    10309           37    1996-09-19
    10310           77    1996-09-20
    
    CustomerID     CustomerName        ContactName           Country
    1           Alfreds Futterkiste     Maria Anders          Germany
    2          Ana Trujillo             Ana Trujillo          Mexico
    3          Antonio Moreno           Antonio Moreno        Mexico
    

    There are two tables

    To join

    SELECT Orders.OrderID, Customers.CustomerName, Orders.OrderDate
    FROM Orders
    INNER JOIN Customers
    ON Orders.CustomerID=Customers.CustomerID; 
    

    Then it shows this.

    OrderID     CustomerName    OrderDate
    10308     Ana Trujillo        9/18/1996
    10365     Antonio Moreno      11/27/1996
    10383     Around the Horn     12/16/1996
    10355     Around the Horn     11/15/1996
    10278     Berglunds snabbkp  8/12/1996
    

    This can be result.

    The join are of three types.

    1.Inner join

    2.Outer join

    3.Self join

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