Question

Please allow me to as a stupid question again.
It is really hard for me to call query mysql from both tables.

post_table

    PostID | UID_frm

    10     | 1
    10     | 2
    10     | 3
    10     | 4
    10     | 5

user_table

    Name   | FID

    tom    | 2
    tom    | 3
    henry  | 4

I want to have this below as result.

UID_frm
2
3
1
4
5

It is the result from column UID_frm but priority order by user_table.FID.
Please advise I want to call like this:(but doesn’t work)

select UID_frm 
from post_table 
where PostID='10'  
order by (select FID 
            from user_table 
           where Name='tom')

Answer 1

I think this is what you are looking for:

SELECT UID_frm
FROM post_table a
     LEFT JOIN user_table b
        ON a.UID_frm = b.FID
WHERE PostID = '10'
ORDER BY (IF(b.Name = 'tom', b.FID, NULL)) ASC, a.UID_frm ASC