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Editorial Team
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Asked: 2026-06-05T05:07:13+00:00

Am working on a project that needs to create children and grandchildren using a

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Am working on a project that needs to create children and grandchildren using a root ID

It works in this way
user_1 registers himself, he(user_1) also registers 2, 3, 4, 5, 6 and have total(maximum) of 5 children
user_2 registers 7, 8, 9, 10, 11
user_3 registers 12, 13, 14, 15, 16
and so on

ON user_1’s profile a tree table lists out his children and from his children,
the grandchildren he has from each of the registered children is also displayed.

                                   1
 ----------------------------------------------------------------------
    |                  |                  |               |                |
     2                3                  4               5                6
---------------     ---------------   ---------------  ------------   -------------- 
|   |   |  |  |     |   |   |  |  |   |  |   |  |  |   |  |  |  |  |  |  |  |   |   |
7   8   9  10 11    12  13 14 15  16  17 18  19 20 21  22 23 24 25 26 27 28 29 30  31

The User_ID’s would not necessarily be in order but just an example
Then also, USER 1 would see the total of children and grandchildren he has
The maximum of Children = 5, grandchildren = 20 == (25)

I have created a table like this

 id | name  | password | totalfamily | grandparent | parent_id
 ---------------------------------------------------------------

I would want the table to be hold info like this the one below

id | name  | password | totalfamily | grandparent | parent_id
1     jon     ******                  NULL          NULL
2     mel     ******                  NULL          1
3     al      ******                  NULL          1
4     me      ******                  1             3

if there is need for new table structure to make it work, that will be ok too.

I have done the procedures for registration(including checking for the parent_id and grandparent_id) and the logging in

But am in a fix concerning how to QUERY the database to help me list out the names like a tree structure to show the children and the grandchildren

I know it needs complex querying statements to execute

I am in urgent need of solving this(hope it doesn’t break the rules) as I have spent days reading Hierarchical data structuring tutorials for my Mysql+PHP yet none seems easy to be heading my direction.

Help anyone???
Thanks in advance.

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1 Answer

  1. Editorial Team

    I have just created table with id,name parent_id

    +----+--------+-----------+
| id | name   | parent_id |
+----+--------+-----------+
|  1 | one    |      NULL |
|  2 | two    |         1 |
|  3 | three  |         1 |
|  4 | four   |         2 |
|  5 | five   |         2 |
|  6 | six    |         2 |
|  7 | seven  |         2 |
|  8 | eight  |         3 |
|  9 | nine   |         3 |
| 10 | ten    |         3 |
| 11 | eleven |         3 |
+----+--------+-----------+

    and when user 1 want to get all the child. Query will like this

    select * from users where parent_id in(select id from users where parent_id = 1) or parent_id = 1;

    I think it may help you

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