Question

I have a category table in MySql database that holds the following data.

id  name                      parent
-------------------------------------
1   Web development           0
2   Application development   0
3   Linux                     0
4   Misc                      0
5   Php                       1
6   Mysql                     1
7   Javascript                1
8   CSS                       1
9   C plus plus               2
10  wxWidgets                 2
11  Tutorials                 3
12  My thoughts               4
13  Java                      1
14  JSP                       13
15  Spring                    14
16  Spring 3.0                15
17  Spring 3.1                15
18  JSF                       13
19  Oracle                    0
20  Oracle 8i                 19
21  Oracle 91                 19
22  JSF 2.0                   18
23  JSF 2.2                   18

I need the following output.

5   Php                       1
9   C plus plus               2
11  Tutorials                 3
12  My thoughts               4
6   Mysql                     1
7   Javascript                1
8   CSS                       1
10  wxWidgets                 2
22  JSF 2.0                   18
23  JSF 2.2                   18
16  Spring 3.0                15
17  Spring 3.1                15
20  Oracle 8i                 19
21  Oracle 91                 19

The result set should contain only the last level of each category. This can be done using a function in MySql. but is there a way to achieve this using an SQL query only?

Answer 1

please check it .. It will work

SELECT id, name, parent
FROM category 
WHERE id NOT 
IN ( SELECT parent FROM category )