DATABASE (SQL) DAY 6) VIEW , UNION ,UNION INTERSECT, UNION ALL

                              * DATABASE VIEW*

* DATABSE VIEW:-VERTUAL TABLE

*  DOESN'T PHYSICALLY EXIST IS SQL SERVER.

* THERE ARE FOLLOWING CONCEPT IN A VIEW

    1) CREATE VIEW 2)UPDATE VIEW 3)DROP VIEW

 :--ALL VIEW IS USE TO TABLE OBJECT 


QUERY:-

1)CREATE VIEW QUERY ;-select view command

:- CREATE VIEW viewname AS SELECT stu1.roll,stu1.mobile from stu1;

:- SELECT * FROM viewname;


2)UPDATE VIEW QUERY ; alter view command

:-ALTER VIEW viewname AS SELECT stu1.mobile FROM stu1;

:-SELECT * FROM viewname ;

:-ALTER VIEW viewname AS SELECT stu1.roll FROM stu1;


3)DELETE VIEW QUERY : drop view command

:-DROP VIEW viewname;

:-SELECT * FROM viewname;


                          *UNION* 

* IT USED TO DIFFERENT TABLE 

* UNION IS REMOVE DUPLICATE ROW BETWEEN SELECT QUERY.

*QUERY:-

:-CREATE TABLE PRODUCT ( PID INT);

:-CREATE TABLE INVEN (PID INT);

:-INSERT INTO PRODUCT VALUES (101);

:-INSERT INTO PRODUCT VALUES (102);

:-INSERT INTO PRODUCT VALUES (103);

:-INSERT INTO PRODUCT VALUES (104);

:-SELECT * FROM PRODUCT;

:-INSERT INTO INVEN VALUES (101);

:-INSERT INTO INVEN VALUES (102);

:-INSERT INTO INVEN VALUES (105);

:-INSERT INTO INVEN VALUES (106);

:-SELECT * FROM INVEN;

:-SELECT PID FROM PRODUCT UNION SELECT PID FROM INVEN;


                          *INTERSECT* 

*ONLY RECORD IN COMMON BETWEEN TWO TABLE.

* QUERY:-

:-SELECT PID FROM PRODUCT INTERSECT SELECT PID FROM INVEN;

                          *UNION ALL*                 

* IT WILL SHOW ALL PRODUCT.

* QUERY:-

:-SELECT PID FROM PRODUCT UNION ALL SELECT PID FROM INVEN;              


VIEW , UNION


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