| 8 | php | 32 | 3 | 10 | popular | jazz | 2007-07-23 19:09:45 |
| 9 | asp.net | 12 | 15 | 13 | popular | country | 2007-07-23 19:09:45 |
| 10 | vb.net | 5 | 20 | 10 | popular | new age | 2007-07-23 19:09:45 |
| 11 | vc.net | 24 | 11 | 14 | popular | new age | 2007-07-23 19:09:45 |
| 12 | uml | 42 | 17 | 17 | classical | general | 2007-07-23 19:09:45 |
| 13 | www.java2s.com | 25 | 44 | 28 | classical | dance | 2007-07-23 19:09:45 |
| 14 | oracle | 32 | 15 | 12 | classical | general | 2007-07-23 19:09:45 |
| 15 | pl/sql | 20 | 10 | 5 | classical | opera | 2007-07-23 19:09:45 |
| 16 | sql server | 23 | 12 | 8 | classical | general | 2007-07-23 19:09:45 |
+---------+----------------+---------+---------+----------+------------+----------+---------------------+
16 rows in set (0.00 sec)
mysql>
mysql>
mysql> select name, department, category
-> from topic
-> where category is null
-> order by name;
empty set (0.00 sec)
mysql>
mysql>
mysql>
mysql> select name, department, category
-> from topic
-> where category = null
-> order by name;
empty set (0.00 sec)
mysql>
