Get single unique row from duplicate data with multiple tables in mysql - mysql

Question

I want to get the unique data from multiple tables with the highest id
Refer below data
Users Table
id firstname_english
------ --------------------
2 Lama
4 Akram
6 Ammar
8 Basil
10 Sami
12 Hasan
14 Adnan
16 Mamoon
18 Sulaiman
20 Wasfi
22 Mervat
Users form status with their id
id users_id status_id
------ ----------- -----------
3 2 10
368 4 10
5 4 10
402 6 9
7 6 10
9 8 10
11 10 10
223 10 10
13 12 10
3253 14 2
15 14 10
17 16 10
1488 16 9
231 16 10
19 18 10
22 20 10
750 20 9
232 22 10
24 22 10
2935 22 9
297 22 10
The Result I need
id firstname_english status_id form_id
------ -------------------- --------------------
2 Lama 10 3
4 Akram 10 368
6 Ammar 9 402
8 Basil 10 8
10 Sami 10 223
12 Hasan 10 12
........and so on
I need to display the highest data from the table 2 with the matching id of table 1

Answer 1

For MySql 8.0+ use row_number() window function:
select
u.id, u.firstname_english,
f.status_id, f.id form_id
from users u inner join (
select *,
row_number() over (partition by users_id order by id desc) rn
from users_form
) f on f.users_id = u.id
where f.rn = 1
See the demo.
For previous versions of MySql:
select
u.id, u.firstname_english,
f.status_id, f.id form_id
from users u inner join (
select uf.* from users_form uf
where not exists (
select 1 from users_form
where users_id = uf.users_id and id > uf.id
)
) f on f.users_id = u.id
See the demo.
Results:
| id | firstname_english | status_id | form_id |
| --- | ----------------- | --------- | ------- |
| 2 | Lama | 10 | 3 |
| 4 | Akram | 10 | 368 |
| 6 | Ammar | 9 | 402 |
| 8 | Basil | 10 | 9 |
| 10 | Sami | 10 | 223 |
| 12 | Hasan | 10 | 13 |
| 14 | Adnan | 2 | 3253 |
| 16 | Mamoon | 9 | 1488 |
| 18 | Sulaiman | 10 | 19 |
| 20 | Wasfi | 9 | 750 |
| 22 | Mervat | 9 | 2935 |