create an alias column called SubCategory. : Column Alias « Query « SQL Server / T-SQL Tutorial

1. SQL Server / T-SQL Tutorial
2. Query
3. Column Alias

7> CREATE TABLE Product(
8>     ProductID               int                NOT NULL,
9>     Name                    nvarchar(25)       NOT NULL,
10>     ProductNumber           nvarchar(25)               ,
11>     Color                   nvarchar(15)       NULL,
12>      StandardCost            money              NOT NULL,
13>      Size                    nvarchar(5)        NULL,
14>      Weight                  decimal(8, 2)      NULL,
15>      ProductLine             nchar(20)           NULL,
16>      SellStartDate           datetime           NOT NULL,
17>      SellEndDate             datetime           NULL
18>  )
19>  GO
1> insert into Product values(1,'Product A', '1','Red',123.123,'1',1,'ProductLine A','1999-03-22','2000-03-22');
2> GO

(1 rows affected)
1>
2>
3> insert into Product values(2,'Product B', '2','Yellow',234.234,'1',3,'ProductLine B','2000-03-22','2001-03-22');
4> GO

(1 rows affected)
1>
2>
3> insert into Product values(3,'Product C', '3','Pink',345.345,'1',3,'ProductLine V','2001-09-22','2006-02-22');
4> GO

(1 rows affected)
1>
2>
3> insert into Product values(4,'Product D', '4','White',456.456,'1',4,'ProductLine D','2002-08-22','2006-03-22');
4> GO

(1 rows affected)
1>
2>
3> insert into Product values(5,'Product E', '5','Black',567.567,'1',5,'ProductLine E','2003-01-22','2003-04-22');
4> GO

(1 rows affected)
1>
2>
3> insert into Product values(6,'Product F', '6','Blue',678.678,'1',6,'ProductLine W','2004-02-22','2005-05-22');
4> GO

(1 rows affected)
1>
2>
3> insert into Product values(7,'Product G', '7','Drak',789.789,'1',7,'ProductLine Q','2005-03-22','2006-03-22');
4> GO

(1 rows affected)
1>
2>
3> insert into Product values(8,'Product H', '8','Gray',234.123,'1',8,'ProductLine F','2006-04-22','2006-09-22');
4> GO

(1 rows affected)
1>
2>
3> insert into Product values(9,'Product I', '9','Red',543.123,'1',9,'ProductLine R','2007-05-22','2008-03-22');
4> GO

(1 rows affected)
1>
2>
3> insert into Product values(0,'Product J', '0','Gold',765.123,'1',0,'ProductLine J','2008-06-22','2009-03-22');
4> GO

(1 rows affected)
1>
2>
3>
4>
5>
6> SELECT ProductID
7>  , Name
8>  , SubCategory = CASE ProductID
9>    WHEN 1 THEN 'Mountain Bike'
10>    WHEN 2 THEN 'Road Bike'
11>     WHEN 3 THEN 'Touring Bike'
12>     WHEN Null THEN 'Something Else'
13>     ELSE '(No Subcategory)'
14>   END
15>  FROM Product
16>  GO
ProductID   Name                      SubCategory
----------- ------------------------- ----------------
          1 Product A                 Mountain Bike
          2 Product B                 Road Bike
          3 Product C                 Touring Bike
          4 Product D                 (No Subcategory)
          5 Product E                 (No Subcategory)
          6 Product F                 (No Subcategory)
          7 Product G                 (No Subcategory)
          8 Product H                 (No Subcategory)
          9 Product I                 (No Subcategory)
          0 Product J                 (No Subcategory)

(10 rows affected)
1>
2>
3> drop table Product;
4> GO