How to add an independent column into a query result - sql

Question

I try to googling for this issue and still couldn't find the solution.
I have 2 column to combine like below:
First table:
ID Name Item
42 america 1433
42 america 1695
42 america 1234
8 london 1433
8 london 1705
8 london 1432
Second table:
ID CreatedBy
42 John
42 Erica
8 Amy Song
8 Alfred
If I just join both table it will become like this:
ID Name Item CreatedBy
42 america 1433 John
42 america 1695 John
42 america 1234 John
42 america 1433 Erica
42 america 1695 Erica
42 america 1234 Erica
8 london 1433 Amy Song
8 london 1705 Amy Song
8 london 1432 Amy Song
8 london 1433 Alfred
8 london 1705 Alfred
8 london 1432 Alfred
Column Created By is only related to ID, and not related to Name and Item.
I just want to insert CreatedBy as a new column into first table that only linked to ID, so the expected result will be like below.
Is there any way I could get result like this?
ID Name Item CreatedBy
42 america 1433 John
42 america 1695 Erica
42 america 1234 NULL
8 london 1433 Amy Song
8 london 1705 Alfred
8 london 1432 NULL
Let say we change second table like this:
Second table:
ID CreatedBy
42 John
8 Amy Song
Result will be like this:
ID Name Item CreatedBy
42 america 1433 John
42 america 1695 NULL
42 america 1234 NULL
8 london 1433 Amy Song
8 london 1705 NULL
8 london 1432 NULL
I really apreacite for your help, and thank you in advanced masta.
NOTE: Column CreatedBy is the independent column that only relate to ID and not relate to Name and Item.

Answer 1

So, I will answer you even though some guys that discussed it here on comments may disagree as there is no a proper logic to your problem.
It is important to note that this answer is for this SPECIFIC case if it won't get you the right data for a larger dataset you have to provide more info on it.
What I did:
I've created a subset from the first set ordering it (and indexing it, window function) by the name then I created another subset from the second set ordering it by the id so, i have:
select id, name, item, row_number() over (partition by name order by name) idx from tablea
And
select id, createdby, row_number() over (partition by id order by id) idx from tableb
Then I LEFT JOIN the tablea with tableb by the id and the order created colum idx so
select a.id, a.name, a.item, b.createdby
from (select id, name, item, row_number() over (partition by name order by name) idx from tablea) a
left join
(select id, createdby, row_number() over (partition by id order by id) idx from tableb) b
on (a.id = b.id and a.idx=b.idx)
order by a.name
The order by is just to get the result as you asked on your question.
See it here: http://sqlfiddle.com/#!3/7ef70/3
For your second sample data: http://sqlfiddle.com/#!3/675625/1