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2010-05-26T13:46:06Z

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==Altering Views==



<source lang="sql">

SQL Server 2000 allows you to alter the definition of a view. The syntax is almost identical to the syntax for creating the view initially:
ALTER VIEW view_name [(column [,?n])]
[WITH ENCRYPTION]
AS
select_statement
[WITH CHECK OPTION]

Alter a view to change the view structure
26> CREATE TABLE authors(
27> au_id varchar(11),
28> au_lname varchar(40) NOT NULL,
29> au_fname varchar(20) NOT NULL,
30> phone char(12) NOT NULL DEFAULT ("UNKNOWN"),
31> address varchar(40) NULL,
32> city varchar(20) NULL,
33> state char(2) NULL,
34> zip char(5) NULL,
35> contract bit NOT NULL
36> )
37> GO
1> insert authors values("1", "Joe", "Abra", "111 111-1111", "6 St.", "Berkeley", "CA", "11111", 1)
2> insert authors values("2", "Jack", "Majo", "222 222-2222", "3 St.", "Oakland" , "CA", "22222", 1)
3> insert authors values("3", "Pink", "Cherry", "333 333-3333", "5 Ln.", "Vancouver", "BC", "33333", 1)
4> insert authors values("4", "Blue", "Albert", "444 444-4444", "7 Av.", "Vancouver", "BC", "44444", 1)
5> insert authors values("5", "Red", "Anne", "555 555-5555", "6 Av.", "Regina", "SK", "55555", 1)
6> insert authors values("6", "Black", "Michel", "666 666-6666", "3 Pl.", "Regina", "SK", "66666", 1)
7> insert authors values("7", "White", "Sylvia", "777 777-7777", "1 Pl.", "Rockville", "MD", "77777", 1)
8> insert authors values("8", "Yellow","Heather","888 888-8888", "3 Pu", "Vacaville", "CA", "88888", 0)
9> insert authors values("9", "Gold", "Dep", "999 999-9999", "5 Av.", "Oakland", "CA", "99999", 0)
10> insert authors values("10", "Siler", "Dean", "000 000-0000", "4 Av.", "Oakland", "CA", "00000", 1)
11> GO
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
1>
2>
3> CREATE VIEW authorlist (first, last, phone)
4> AS
5> SELECT au_fname, au_lname, phone
6> FROM authors
7> GO
1> GRANT SELECT ON authorlist (first, last) TO PUBLIC
2> GO
1>
2>
3> ALTER VIEW authorlist (phone, first, last)
4> AS
5> SELECT phone, au_fname, au_lname
6> FROM authors
7> GO
1>
2> drop VIEW authorlist;
3> GO
1>
2> drop table authors;
3> GO
</source>

==The ALTER statement is issued with the revised view definition==



<source lang="sql">
1> create table employee(
2> ID int,
3> name nvarchar (10),
4> salary int,
5> start_date datetime,
6> city nvarchar (10),
7> region char (1))
8> GO
1>
2> insert into employee (ID, name, salary, start_date, city, region)
3> values (1, "Jason", 40420, "02/01/94", "New York", "W")
4> GO
(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (2, "Robert",14420, "01/02/95", "Vancouver","N")
3> GO
(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (3, "Celia", 24020, "12/03/96", "Toronto", "W")
3> GO
(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (4, "Linda", 40620, "11/04/97", "New York", "N")
3> GO
(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (5, "David", 80026, "10/05/98", "Vancouver","W")
3> GO
(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (6, "James", 70060, "09/06/99", "Toronto", "N")
3> GO
(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (7, "Alison",90620, "08/07/00", "New York", "W")
3> GO
(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (8, "Chris", 26020, "07/08/01", "Vancouver","N")
3> GO
(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (9, "Mary", 60020, "06/09/02", "Toronto", "W")
3> GO
(1 rows affected)
1>
2> select * from employee
3> GO
ID name salary start_date city region
----------- ---------- ----------- ----------------------- ---------- ------
1 Jason 40420 1994-02-01 00:00:00.000 New York W
2 Robert 14420 1995-01-02 00:00:00.000 Vancouver N
3 Celia 24020 1996-12-03 00:00:00.000 Toronto W
4 Linda 40620 1997-11-04 00:00:00.000 New York N
5 David 80026 1998-10-05 00:00:00.000 Vancouver W
6 James 70060 1999-09-06 00:00:00.000 Toronto N
7 Alison 90620 2000-08-07 00:00:00.000 New York W
8 Chris 26020 2001-07-08 00:00:00.000 Vancouver N
9 Mary 60020 2002-06-09 00:00:00.000 Toronto W
(9 rows affected)
1>
2>
3> CREATE VIEW myView
4> AS
5> SELECT ID, Name
6> FROM Employee
7> GO
1>
2> select * from myView
3> GO
ID Name
----------- ----------
1 Jason
2 Robert
3 Celia
4 Linda
5 David
6 James
7 Alison
8 Chris
9 Mary
(9 rows affected)
1>
2> -- The ALTER statement is issued with the revised view definition:
3>
4> ALTER VIEW MyView
5> AS
6> SELECT ID, Name, Salary
7> FROM Employee
8> GO
1>
2> select * from myView
3> GO
ID Name Salary
----------- ---------- -----------
1 Jason 40420
2 Robert 14420
3 Celia 24020
4 Linda 40620
5 David 80026
6 James 70060
7 Alison 90620
8 Chris 26020
9 Mary 60020
(9 rows affected)
1>
2>
3> drop table employee
4> GO
1>

</source>

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