Question

so I’m having trouble working this out:

I need to display the name and telephone number of the people who own the most properties from these tables:

owners:

ownerno | fname | lname | telno 
_________________________________
B6      | John  | g     | 67869
_________________________________
B5      | Tom   | f     | 46876
_________________________________
B4      | Sally | s     | 23456
_________________________________
B3      | Ann   | a     | 23786

Propertyowned:

propertyno | ownerno 
_____________________
BH5        | B6
_____________________
BG6        | B5
_____________________
BJ7        | B6
_____________________
BF5        | B5
_____________________
BD4        | B4

Hope you can help me out
Thanks

Answer 1

This should do:

SELECT 
    count(p.propertyno) as numproperties, 
    o.fcname, 
    o.lname, o.telno
FROM 
    property p, 
    owner o 
WHERE 
    o.ownerno = p.ownerno 
GROUP BY 
    o.ownerno
ORDER BY
    numproperties desc
LIMIT 1