Displaying rows with count 0 with mysql group by

Question

I have two tables in MySql Company : (cname,city) works : (ename,cname,salary)

I want to display number of employees working for every company, even if that number i

Answer 1

Classic case for a LEFT JOIN:

SELECT
  c.cname,
  COUNT(w.ename) wcount 
FROM
  company c
  LEFT JOIN works w ON c.cname = w.cname
GROUP BY
  c.cname