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  • FULL OUTER JOIN IN SQL

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    FULL OUTER JOIN

    If you want to combine the results of both LEFT and RIGHT join than we use FULL JOIN keyword. The joined table which created after FULL JOIN contains all records from both the two tables, and fills null value for those places where missing matches take place.

    Syntax: Below is the syntax of FULL JOIN :-

    SELECT columnname 
    FROM tablename1
    FULL JOIN tablename2
    ON tablename1.commonname = tablename2.commonname;
    

    example:- Below is the customers table for explain FULL JOIN:-

      CUSTOMER-ID   NAME      AGE     ADDRESS       SALARY   
      001           suresh    23      rishikesh      20000
      002           pankaj    28      ranikhet       19999
      003           ramesh    22      punjab         10000
      004           ram       23      delhi          10000
    

    Below is ORDERS table :-

    ORDER-Id      DATE             CUSTOMER-ID   AMOUNT
     102         1-9-2015            003          5000 
     100         4-9-2015            002          1500 
     101         5-9-2015            001           760 
     103         10-9-2015           003          2090 
    

    Now, join these two tables using FULL JOIN

     SELECT  CUSTOMER-ID, NAME, AMOUNT, DATE
         FROM CUSTOMERS
         FULL JOIN ORDERS
         ON CUSTOMERS.ID = ORDERS.CUSTOMER-ID;
    

    This would produce the following result:

    CUSTOMER-ID         NAME     AMOUNT  DATE                
    
    001               suresh      760      5-9-2015
    002               pankaj      1500     4-9-2015
    003               ramesh      5000     1-9-2015
    003               ramesh      2090     10-9-2015
    004               ram         NULL     NULL
    

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