Question

i am trying to write an sql statement that will select items from one table and order it by the result of the other table..

the 2 tables are:

events:
id, name

attendance:
user, event

ive got this statement:

SELECT * 
FROM `attendance` 
WHERE event='1' 
  AND user IN (1,2,3,4,5,6,7,8,9,10,11,12,13,444,153)

I am using this to get the number of friends that coming to event number 1.

now I want to combine that statement with another one to create a statement that select all the events, and order it by the number of friends that going…
how can i write that statement?

Thank you very much, Amir.

Answer 1

I would try something like this:

SELECT
    id,
    name,
    (SELECT COUNT(*) FROM attendance att WHERE att.event = ev.id) AS attending
FROM
    event ev
ORDER BY
    attending DESC

However, although I would try something like that, fact is I haven’t, so this might not work as is.