Question

(SELECT * FROM table1 
INNER JOIN table2 
ON table1.id = table2.id) 
AS t1 
JOIN (SELECT ROUND(RAND() * (SELECT MAX(table1.id) FROM table1)) AS id) 
AS t2 
WHERE t1.id >= t2.id 
LIMIT 1) 

I try to use RAND() max(id) to get a random mysql result, but get a #1064 error.

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AS t1 JOIN (SELECT ROUND(RAND() * (SELECT MAX(table1.id) FROM table1))' at line 1

Where is the problem? thanks.

Answer 1

(assuming that this code snippet is an entire query)

May be wrong but your statement does not have a SELECT … in short it looks like this:

t1 JOIN t2 WHERE …

There is no SELECT something FROM t1 JOIN t2 WHERE …

Not sure if I make myself clear…

Addendum:

Not sure what you re trying to achieve, but this code bellow returns random IDs from your tables (variation of your query) so perhaps you can use it. A bit messy perhaps but then again I have no idea what are you trying to achieve :).

SELECT * FROM 
  (SELECT table1.id as id1 
    FROM table1 
    INNER JOIN table2 
    ON table1.id = table2.id)  as t1
JOIN (
  (SELECT ROUND(RAND() * (SELECT MAX(table1.id) FROM table1)) AS id2) 
AS t2 )
WHERE t1.id1 >= t2.id2
LIMIT 1

You can select id1 or id2 instead of *, depending on what is your goal…