The expression in the select list subtracts the Reserved value from the total : Simple Select « Select Clause « SQL / MySQL

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SQL / MySQL » Select Clause » Simple Select 
The expression in the select list subtracts the Reserved value from the total
       
mysql>
mysql>
mysql> CREATE TABLE CDs
    -> (
    ->     CDID SMALLINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
    ->     CDName 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 (0.01 sec)

mysql>
mysql> INSERT INTO CDs (CDName, InStock, OnOrder, Reserved, Department, CategoryVALUES
    -> ('Xml', 1053'Popular', 'Rock'),
    -> ('Java', 1053'Classical', 'Opera'),
    -> ('SQL', 1741'Popular', 'Jazz'),
    -> ('MySQL', 942'Classical', 'Dance'),
    -> ('CSS', 2425'Classical', 'General'),
    -> ('HTML', 1668'Classical', 'Vocal'),
    -> ('Oracle', 2256'Popular', 'Blues'),
    -> ('Javascript', 32310'Popular', 'Jazz'),
    -> ('Data type', 121513'Popular', 'Country'),
    -> ('Flash', 52010'Popular', 'New Age'),
    -> ('Ajax', 241114'Popular', 'New Age'),
    -> ('Photoshop', 421717'Classical', 'General'),
    -> ('Word', 254428'Classical', 'Dance'),
    -> ('iPhone', 321512'Classical', 'General'),
    -> ('MacBook', 20105'Classical', 'Opera'),
    -> ('Linux', 23128'Classical', 'General'),
    -> ('Shell', 231017'Popular', 'Country'),
    -> ('Pascal', 182010'Popular', 'Jazz'),
    -> ('Ruby', 2257'Popular', 'Blues'),
    -> ('Sql Server', 281716'Classical', 'General'),
    -> ('Opera', 103512'Classical', 'Opera'),
    -> ('Safari', 153014'Popular', 'Blues'),
    -> ('C'4208'Popular', 'Blues'),
    -> ('C++', 1688'Classical', 'General');
Query OK, 24 rows affected (0.00 sec)
Records: 24  Duplicates: 0  Warnings: 0

mysql>
mysql>
mysql> SELECT CDName, InStock+OnOrder-Reserved AS Total
    -> FROM CDs;
+------------+-------+
| CDName     | Total |
+------------+-------+
| Xml        |    12 |
| Java       |    12 |
| SQL        |    20 |
| MySQL      |    11 |
| CSS        |    21 |
HTML       |    14 |
| Oracle     |    21 |
| Javascript |    25 |
| Data type  |    14 |
| Flash      |    15 |
| Ajax       |    21 |
| Photoshop  |    42 |
| Word       |    41 |
| iPhone     |    35 |
| MacBook    |    25 |
| Linux      |    27 |
| Shell      |    16 |
| Pascal     |    28 |
| Ruby       |    20 |
| Sql Server |    29 |
| Opera      |    33 |
| Safari     |    31 |
| C          |    34 |
| C++        |    16 |
+------------+-------+
24 rows in set (0.00 sec)

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

mysql>

   
    
    
    
    
    
    
  
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