mySQL SELECT in two tables

[tazanet]

I have two tables members and ads, members table has auto_increment \'ID\' , \'CREDIT\' and some members information.

ads table has \'AID\' auto_increment and \'ID\' to track who\'s link is that

 

Basically 1 member can have up to 5 link ads. I want to get from query LIMIT 5 ads who has enough credits and not from same members ID

 

I\'m using php, have 4000 members row and growing

 

also rand() gives me always first row its not accurate

 

please help how can i design it

[tazanet]

members table

---------------------------------

ID , CREDIT , fname , lname

1 , 24 , jon , smith

2 , 50 , mark , tween

3 , 23 , sam , jonson

4 , 61 , dave , derian

5 , 28 , gio , fery

6 , 95 , anna , lopez

 

ads table

--------------------------------

AID , ID , ACTIVE

1 , 1 , Y

2 , 1 , Y

3 , 1 , Y

4 , 2 , Y

5 , 2 , N

6 , 2 , Y

7 , 3 , Y

8 , 3 , Y

9 , 3 , Y

10 , 4 , N

11 , 4 , Y

12 , 4 , Y

 

 

 

members can have few ads few rows in ads table. I want to get LIMIT 5 ads from different member randomly every time different ad. Lets say if 1 member has 3 ads get 1 ad randomly from each member LIMIT 5 times

 

i\'m using php4 mysql3.23

 

 

this one works but problem is it gives me a first ad in group always, it doesn\'t randomize

 

SELECT * FROM members m inner join ads a ON m.ID=a.ID WHERE CRED>1 GROUP BY m.ID ORDER BY RAND() LIMIT 5