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sub queries
Posted by: jmmal2
Date: October 10, 2004 01:50AM

hey all i was wondering if anyone was able to help me with my small problem.
mysql> describe film;
+-----------+----------------------+------+-----+------------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------+----------------------+------+-----+------------+-------+
| filmNo | smallint(4) unsigned | | PRI | 0 | |
| filmName | varchar(40) | | | | |
| dirId | smallint(4) unsigned | | | 0 | |
| dateAdded | date | | | 0000-00-00 | |
| yearMade | year(4) | YES | | NULL | |
+-----------+----------------------+------+-----+------------+-------+
5 rows in set (0.05 sec)
this is the film table

mysql> describe filmcopy;
+------------+----------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+------------+----------------------+------+-----+---------+-------+
| copyid | smallint(4) unsigned | | PRI | 0 | |
| filmid | smallint(4) unsigned | | PRI | 0 | |
| buyerid | smallint(4) unsigned | | | 0 | |
| mastercopy | enum('Y','N') | | | Y | |
| format | enum('Video','DVD') | | | Video | |
+------------+----------------------+------+-----+---------+-------+
5 rows in set (0.01 sec)
this is the filmcopy table

mysql> describe buyer;
+------------+----------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+------------+----------------------+------+-----+---------+-------+
| buyerid | smallint(4) unsigned | | PRI | 0 | |
| buyerfname | char(10) | | | | |
| buyersname | char(10) | | | | |
| pcode | char(4) | | | | |
| discount | float | YES | | NULL | |
+------------+----------------------+------+-----+---------+-------+
5 rows in set (0.05 sec)
this is the buyer copy


****now i need to find the film's that have not sold any copies?***

***This is what i have found so far***
mysql> select distinct (f.filmno), f.filmname
-> from film f;
+--------+----------------------------+
| filmno | filmname |
+--------+----------------------------+
| 1 | 2001: A Space Odyssey |
| 2 | Casablanca |
| 3 | Fanny nad Alexander |
| 4 | The Cars That Ate Paris |
| 5 | Picnic At Hanging Rock |
| 6 | Mad Max |
| 7 | Mad Max2: The Road Warrior |
| 8 | Clockwork Orange |
+--------+----------------------------+
8 rows in set (0.00 sec)
this shows all films available.

mysql> select distinct c.filmid
-> from filmcopy c
-> where c.buyerid >0;
+--------+
| filmid |
+--------+
| 1 |
| 2 |
| 4 |
| 6 |
| 7 |
| 8 |
| 5 |
+--------+
7 rows in set (0.01 sec)
*******this shows that film no 3 has sold know copies.********

*****How do i create a subquery to display filmno 3 **** has sold no copies


if anyone can help that would be great

**here is some more stuff that might help

mysql> select * from filmcopy;
+--------+--------+---------+------------+--------+
| copyid | filmid | buyerid | mastercopy | format |
+--------+--------+---------+------------+--------+
| 1 | 1 | 0 | Y | Video |
| 1 | 2 | 0 | Y | Video |
| 1 | 3 | 0 | Y | Video |
| 1 | 4 | 0 | Y | Video |
| 1 | 5 | 0 | Y | Video |
| 1 | 6 | 0 | Y | DVD |
| 1 | 7 | 0 | Y | DVD |
| 1 | 8 | 0 | Y | DVD |
| 2 | 1 | 1 | N | Video |
| 2 | 2 | 3 | N | Video |
| 2 | 4 | 4 | N | Video |
| 2 | 5 | 0 | Y | DVD |
| 2 | 6 | 5 | N | DVD |
| 2 | 7 | 1 | N | DVD |
| 2 | 8 | 4 | N | DVD |
| 3 | 2 | 5 | N | Video |
| 3 | 4 | 5 | N | Video |
| 3 | 5 | 2 | N | DVD |
| 3 | 6 | 0 | Y | Video |
| 3 | 7 | 5 | N | DVD |
| 3 | 8 | 5 | N | DVD |
| 4 | 5 | 5 | N | DVD |
| 4 | 6 | 2 | N | Video |
| 5 | 5 | 1 | N | Video |
| 5 | 6 | 4 | N | DVD |
+--------+--------+---------+------------+--------+
25 rows in set (0.00 sec)

mysql> select * from film;
+--------+----------------------------+-------+------------+----------+
| filmNo | filmName | dirId | dateAdded | yearMade |
+--------+----------------------------+-------+------------+----------+
| 1 | 2001: A Space Odyssey | 1 | 1990-01-15 | 1968 |
| 2 | Casablanca | 2 | 1990-01-15 | 1942 |
| 3 | Fanny nad Alexander | 4 | 1990-01-15 | 1983 |
| 4 | The Cars That Ate Paris | 5 | 1992-04-22 | 1974 |
| 5 | Picnic At Hanging Rock | 5 | 1992-04-22 | 1975 |
| 6 | Mad Max | 3 | 1992-04-22 | 1979 |
| 7 | Mad Max2: The Road Warrior | 3 | 1992-04-22 | 1971 |
| 8 | Clockwork Orange | 1 | 2002-09-28 | 1971 |
+--------+----------------------------+-------+------------+----------+
8 rows in set (0.01 sec)
mysql> select * from buyer;
+---------+------------+------------+-------+----------+
| buyerid | buyerfname | buyersname | pcode | discount |
+---------+------------+------------+-------+----------+
| 1 | Christine | Slater | 3145 | 0 |
| 2 | George | Rice | 3142 | 2.5 |
| 3 | Cheryl | Gregory | 3146 | 2.5 |
| 4 | Ray | Gregory | 3146 | 5 |
| 5 | Andy | Campbell | 3147 | 5 |
+---------+------------+------------+-------+----------+
5 rows in set (0.00 sec)

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Posted
sub queries
October 10, 2004 01:50AM
October 12, 2004 01:20PM


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