Giving the result of column calculation an alias name : Alias « Select Query « MySQL Tutorial

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MySQL Tutorial » Select Query » Alias 
2. 8. 1. Giving the result of column calculation an alias name
 
mysql>
mysql> CREATE TABLE Topic(
    ->    TopicID     SMALLINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
    ->    Name        VARCHAR(50NOT NULL,
    ->    InStock     SMALLINT UNSIGNED NOT NULL,
    ->    OnOrder     SMALLINT UNSIGNED NOT NULL,
    ->    Reserved    SMALLINT UNSIGNED NOT NULL,
    ->    Department  ENUM('Classical', 'Popular') NOT NULL,
    ->    Category    VARCHAR(20NOT NULL,
    ->    RowUpdate   TIMESTAMP NOT NULL
    -> );
Query OK, rows affected (0.02 sec)

mysql>
mysql>
mysql> INSERT INTO Topic (Name,          InStock, OnOrder, Reserved, Department,   CategoryVALUES
    ->                   ('Java',          10,      5,       3,        'Popular',    'Rock'),
    ->                   ('JavaScript',    10,      5,       3,        'Classical',  'Opera'),
    ->                   ('C Sharp',       17,      4,       1,        'Popular',    'Jazz'),
    ->                   ('C',             9,       4,       2,        'Classical',  'Dance'),
    ->                   ('C++',           24,      2,       5,        'Classical',  'General'),
    ->                   ('Perl',          16,      6,       8,        'Classical',  'Vocal'),
    ->                   ('Python',        2,       25,      6,        'Popular',    'Blues'),
    ->                   ('Php',           32,      3,       10,       'Popular',    'Jazz'),
    ->                   ('ASP.net',       12,      15,      13,       'Popular',    'Country'),
    ->                   ('VB.net',        5,       20,      10,       'Popular',    'New Age'),
    ->                   ('VC.net',        24,      11,      14,       'Popular',    'New Age'),
    ->                   ('UML',           42,      17,      17,       'Classical',  'General'),
    ->                   ('www.java2s.com',25,      44,      28,       'Classical',  'Dance'),
    ->                   ('Oracle',        32,      15,      12,       'Classical',  'General'),
    ->                   ('Pl/SQL',        20,      10,      5,        'Classical',  'Opera'),
    ->                   ('Sql Server',    23,      12,      8,        'Classical',  'General');
Query OK, 16 rows affected (0.00 sec)
Records: 16  Duplicates: 0  Warnings: 0

mysql>
mysql> select from Topic;
+---------+----------------+---------+---------+----------+------------+----------+---------------------+
| TopicID | Name           | InStock | OnOrder | Reserved | Department | Category | RowUpdate           |
+---------+----------------+---------+---------+----------+------------+----------+---------------------+
|       | Java           |      10 |       |        | Popular    | Rock     | 2007-07-23 19:09:48 |
|       | JavaScript     |      10 |       |        | Classical  | Opera    | 2007-07-23 19:09:48 |
|       | C Sharp        |      17 |       |        | Popular    | Jazz     | 2007-07-23 19:09:48 |
|       | C              |       |       |        | Classical  | Dance    | 2007-07-23 19:09:48 |
|       | C++            |      24 |       |        | Classical  | General  | 2007-07-23 19:09:48 |
|       | Perl           |      16 |       |        | Classical  | Vocal    | 2007-07-23 19:09:48 |
|       | Python         |       |      25 |        | Popular    | Blues    | 2007-07-23 19:09:48 |
|       | Php            |      32 |       |       10 | Popular    | Jazz     | 2007-07-23 19:09:48 |
|       | ASP.net        |      12 |      15 |       13 | Popular    | Country  | 2007-07-23 19:09:48 |
|      10 | VB.net         |       |      20 |       10 | Popular    | New Age  | 2007-07-23 19:09:48 |
|      11 | VC.net         |      24 |      11 |       14 | Popular    | New Age  | 2007-07-23 19:09:48 |
|      12 | UML            |      42 |      17 |       17 | Classical  | General  | 2007-07-23 19:09:48 |
|      13 | www.java2s.com |      25 |      44 |       28 | Classical  | Dance    | 2007-07-23 19:09:48 |
|      14 | Oracle         |      32 |      15 |       12 | Classical  | General  | 2007-07-23 19:09:48 |
|      15 | Pl/SQL         |      20 |      10 |        | Classical  | Opera    | 2007-07-23 19:09:48 |
|      16 | Sql Server     |      23 |      12 |        | Classical  | General  | 2007-07-23 19:09:48 |
+---------+----------------+---------+---------+----------+------------+----------+---------------------+
16 rows in set (0.00 sec)

mysql>
mysql> SELECT Name, InStock+OnOrder-Reserved AS Available
    -> FROM Topic
    -> WHERE Name LIKE '%bach%'
    -> ORDER BY Name;
Empty set (0.00 sec)

mysql>
mysql> drop table Topic;
Query OK, rows affected (0.00 sec)

        
2. 8. Alias
2. 8. 1. Giving the result of column calculation an alias name
2. 8. 2. To sort the output by alias
2. 8. 3. Use Aliasing in table joins
2. 8. 4. Aliasing the function in select statement
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