How do I group a date field to get quarterly results in MySQL?

Question

I have a job table that holds jobs and leaddate is the field for the job entry.

The result I want to get is the number of jobs I have in each quarter. My query count

Answer 1

I usually combine quarter and year into a single YEAR-QUARTER field:

select jobid, count(jobid) as jobcount, 
CONCAT( YEAR(leaddate),'-',QUARTER(leaddate) ) as year_qtr
from jobs
where contactid='19249'
group by year_qtr

RETURNS data like:

19249, 324, 2011-3
19249,   4, 2011-2
19249,  34, 2011-1