Creating a Computed Column in alter table command : ALTER TABLE « Table « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Table » ALTER TABLE 
3. 2. 15. Creating a Computed Column in alter table command
3>
4>
5CREATE TABLE employee(
6>    id          INTEGER NOT NULL PRIMARY KEY,
7>    first_name  VARCHAR(10),
8>    last_name   VARCHAR(10),
9>    salary      DECIMAL(10,2),
10>    start_Date  DATETIME,
11>    region      VARCHAR(10),
12>    city        VARCHAR(20),
13>    managerid   INTEGER
14);
15> 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>
4> ALTER TABLE employee
5> ADD CostPerUnit AS (salary/ID)
6>
7SELECT *
8FROM employee;
9>
10>
11>
12> drop table employee;
13> GO
id          first_name last_name  salary       start_Date              region     city                 managerid   CostP
erUnit
----------- ---------- ---------- ------------ ----------------------- ---------- -------------------- ----------- -----
------------------
          Jason      Martin          5890.00 2005-03-22 00:00:00.000 North      Vancouver                      3
5890.0000000000000
          Alison     Mathews         4789.00 2003-07-21 00:00:00.000 South      Utown                          4
2394.5000000000000
          James      Smith           6678.00 2001-12-01 00:00:00.000 North      Paris                          5
2226.0000000000000
          Celia      Rice            5567.00 2006-03-03 00:00:00.000 South      London                         6
1391.7500000000000
          Robert     Black           4467.00 2004-07-02 00:00:00.000 East       Newton                         7
 893.4000000000000
          Linda      Green           6456.00 2002-05-19 00:00:00.000 East       Calgary                        8
1076.0000000000000
          David      Larry           5345.00 2008-03-18 00:00:00.000 West       New York                       9
 763.5714285714285
          James      Cat             4234.00 2007-07-17 00:00:00.000 West       Regina                         9
 529.2500000000000
          Joan       Act             6123.00 2001-04-16 00:00:00.000 North      Toronto                       10
 680.3333333333333

(rows affected)
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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