Altering a Table: A Basic Form : ALTER TABLE « Table « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Table » ALTER TABLE 
3. 2. 5. Altering a Table: A Basic Form
ALTER TABLE table_name
        ADD col_name type [NULL | IDENTITY]
        [{, col_name type [NULL | IDENTITY]} ...]
        DROP COLUMN col_name [{, col_name ...]
        ALTER COLUMN col_name type {NULL | IDENTITY}
        [{, col_name type NULL | IDENTITY...]


12CREATE TABLE employee(
13>    id          INTEGER NOT NULL PRIMARY KEY,
14>    first_name  VARCHAR(10),
15>    last_name   VARCHAR(10),
16>    salary      DECIMAL(10,2),
17>    start_Date  DATETIME,
18>    region      VARCHAR(10),
19>    city        VARCHAR(20),
20>    managerid   INTEGER
21);
22> GO
1INSERT INTO employee VALUES (1'Jason' ,  'Martin', 5890,'2005-03-22','North','Vancouver',3);
2> GO

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

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

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

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

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

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

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

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

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

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

(rows affected)
1> drop table employee;
2> GO
1>
2>
3. 2. ALTER TABLE
3. 2. 1. The basic syntax of the ALTER TABLE statement
3. 2. 2. drop column syntax
3. 2. 3. Change the length of the emp_name column in the employee table from varchar(30) to varchar(50)
3. 2. 4. Alter table to add a constraint based on IN function
3. 2. 5. Altering a Table: A Basic Form
3. 2. 6. Alter table to add column
3. 2. 7. Alter table to drop a column
3. 2. 8. The DROP COLUMN clause provides the ability to drop an existing column of the table.
3. 2. 9. ALTER data size for a COLUMN
3. 2. 10. Altering a Table: Enhanced Form
3. 2. 11. Use ALTER TABLE statement to define the primary key
3. 2. 12. Use ALTER TABLE statement to define the foreign key of a table.
3. 2. 13. Each declarative integrity constraint can be removed using the DROP clause of the ALTER TABLE statement.
3. 2. 14. Expanded nvarchar(20) to nvarchar(300)
3. 2. 15. Creating a Computed Column in alter table command
3. 2. 16. Create a Table Index
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