Admissions by Zipcode

Start with the basic count of intakes between two dates, grouped by zip code:

SELECT
   zip,
   COUNT(*) AS "N"
FROM 
   sos.rv_patients
WHERE
   intakedate BETWEEN '2004-01-01' AND '2004-12-31'
GROUP BY 
   zip
ORDER BY 
   zip

Next, let’s make it a little more interesting by breaking the results down further by year and month:

SELECT
   zip,
   YEAR(intakedate) AS "Yr",
   MONTH(intakedate) AS "Mon",
   COUNT(*) AS "N"
FROM 
   sos.rv_patients
WHERE
   intakedate BETWEEN '1990-01-01' AND '2005-12-31'
GROUP BY 
   zip, 
   "Yr", 
   "Mon"
ORDER BY 
   zip, 
   "Yr", 
   "Mon"

You could, of course, change the order of the columns in the SELECT clause and in the ORDER BY line
to reorganize the output.