WITH SCHEMABINDING clause protects a view by binding it to the database structure, or schema. : Create View « View « SQL Server / T-SQL Tutorial

1. SQL Server / T-SQL Tutorial
2. View
3. Create View

This prevents the underlying base tables from being deleted or modified in any way that affects the view. 

3>
4> CREATE TABLE dbo.employee(
5>    id          INTEGER NOT NULL PRIMARY KEY,
6>    first_name  VARCHAR(10),
7>    last_name   VARCHAR(10),
8>    salary      DECIMAL(10,2),
9>    start_Date  DATETIME,
10>    region      VARCHAR(10),
11>    city        VARCHAR(20),
12>    managerid   INTEGER
13> );
14> GO
1> INSERT INTO dbo.employee VALUES (1, 'Jason' ,  'Martin', 5890,'2005-03-22','North','Vancouver',3);
2> GO

(1 rows affected)
1> INSERT INTO dbo.employee VALUES (2, 'Alison',  'Mathews',4789,'2003-07-21','South','Utown',4);
2> GO

(1 rows affected)
1> INSERT INTO dbo.employee VALUES (3, 'James' ,  'Smith',  6678,'2001-12-01','North','Paris',5);
2> GO

(1 rows affected)
1> INSERT INTO dbo.employee VALUES (4, 'Celia' ,  'Rice',   5567,'2006-03-03','South','London',6);
2> GO

(1 rows affected)
1> INSERT INTO dbo.employee VALUES (5, 'Robert',  'Black',  4467,'2004-07-02','East','Newton',7);
2> GO

(1 rows affected)
1> INSERT INTO dbo.employee VALUES (6, 'Linda' ,  'Green' , 6456,'2002-05-19','East','Calgary',8);
2> GO

(1 rows affected)
1> INSERT INTO dbo.employee VALUES (7, 'David' ,  'Larry',  5345,'2008-03-18','West','New York',9);
2> GO

(1 rows affected)
1> INSERT INTO dbo.employee VALUES (8, 'James' ,  'Cat',    4234,'2007-07-17','West','Regina',9);
2> GO

(1 rows affected)
1> INSERT INTO dbo.employee VALUES (9, 'Joan'  ,  'Act',    6123,'2001-04-16','North','Toronto',10);
2> GO

(1 rows affected)
1>
2> select * from dbo.employee;
3> GO
id          first_name last_name  salary       start_Date              region     city                 managerid
----------- ---------- ---------- ------------ ----------------------- ---------- -------------------- -----------
          1 Jason      Martin          5890.00 2005-03-22 00:00:00.000 North      Vancouver                      3
          2 Alison     Mathews         4789.00 2003-07-21 00:00:00.000 South      Utown                          4
          3 James      Smith           6678.00 2001-12-01 00:00:00.000 North      Paris                          5
          4 Celia      Rice            5567.00 2006-03-03 00:00:00.000 South      London                         6
          5 Robert     Black           4467.00 2004-07-02 00:00:00.000 East       Newton                         7
          6 Linda      Green           6456.00 2002-05-19 00:00:00.000 East       Calgary                        8
          7 David      Larry           5345.00 2008-03-18 00:00:00.000 West       New York                       9
          8 James      Cat             4234.00 2007-07-17 00:00:00.000 West       Regina                         9
          9 Joan       Act             6123.00 2001-04-16 00:00:00.000 North      Toronto                       10

(9 rows affected)
1>
2>
3>
4> CREATE VIEW dbo.v_employee
5> WITH SCHEMABINDING
6> AS
7> SELECT ID, first_name
8> FROM dbo.employee
9> GO
1>
2> SET STATISTICS IO ON
3> GO
1> SELECT TOP 5 ID, first_name
2> FROM dbo.v_employee
3>
4> CREATE UNIQUE CLUSTERED INDEX UCI_v_employee
5> ON dbo.v_employee (ID)
6> GO
ID          first_name
----------- ----------
          1 Jason
          2 Alison
          3 James
          4 Celia
          5 Robert

(5 rows affected)
Table 'employee'. Scan count 1, logical reads 2, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical
 reads 0, lob read-ahead reads 0.

1>
2> CREATE NONCLUSTERED INDEX NI_v_employee
3> ON dbo.v_employee (First_Name)
4> GO

1>
2> SELECT TOP 5 ID, first_name
3> FROM dbo.v_employee
4>
5> SET STATISTICS IO OFF
6> GO
ID          first_name
----------- ----------
          1 Jason
          2 Alison
          3 James
          4 Celia
          5 Robert

(5 rows affected)
Table 'employee'. Scan count 1, logical reads 2, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical
 reads 0, lob read-ahead reads 0.
1>
2>
3> drop view dbo.v_employee;
4> GO
1> drop table dbo.employee;
2> GO
1>
2>
3>