SQL Query: Need order by count, most must be on top, the rest follows

Question

TABLEA

JobCode Job1 Job2 Job3 zip
------- ---- ---- ---- ----------
F       F    S    NULL 90030
F       F    S    NULL 90031
F       F    S    NULL 90031
F              


        

Answer 1

To accomplish this, you should join against a subquery which returns the count per zipcode. The joined subquery is only needed to provide the counts (even if not displayed), while the main table yourtable provides all the rest of the columns.

SELECT 
  JobCode, 
  Job1,
  Job2,
  Job3,
  subq.zip
FROM
  yourtable
  JOIN (
     /* Subquery returns count per zip group */
     SELECT zip, COUNT(*) AS numzip 
     FROM yourtable 
     GROUP BY zip
  ) subq ON yourtable.zip = subq.zip
ORDER BY numzip DESC