MySQL showing the last two months sales - mysql

Question

I am trying to extract a report that shows the last two full calendar months sales as per the following format:
Customer August 2013 September 2014
Company A 1,250 2,543
Company B 4,245 1,423
Company C 1,432 1,642
I have a table with the customer and individual transaction with a cost. I am fine getting this out but have no idea how to get two columns next to each other.
select customers.customer as Customer,
sum(job.price) as August_2014
from job,customers
where customers.cust_id=job.customer
and
job.collect_date between '2014-08-01' and '2014-08-31'
group by customer
order by August_2014 desc
limit 0,10
Thanks for any help.
John

Answer 1

Use case expressions inside the SUM() function, like this:
SELECT
customers.customer AS Customer
, SUM(case when job.collect_date >= '2014-08-01' and job.collect_date < '2014-09-01' THEN job.price ELSE 0 END) AS August_2014
, SUM(case when job.collect_date >= '2014-09-01' and job.collect_date < '2014-10-01' THEN job.price ELSE 0 END) AS September_2014
FROM job
INNER JOIN customers ON customers.cust_id = job.customer
WHERE ( job.collect_date >= '2014-08-01' AND job.collect_date < '2014-10-01' )
GROUP BY
customers.customer
ORDER BY
August_2014 DESC
limit 0,10
;
I changed the join syntax, explicit joins like this are strongly recommended.
Also note I have changed the method for "date ranges". Just do NOT trust "between" for this. Always use the method shown above and you will not have any gaps or overlaps in the data (i.e. your numbers will be accurate).
( date_field >= lower_date_here AND date_field < higher_date_here )
As you can see, the "higher date" is one day more than your original, that's because we use LESS THAN on the higher date

Answer 2

Try this:
SELECT
customers.customer AS Customer,
MONTH(job.collect_date) AS Month,
sum(job.price) AS SumPrice
FROM
job,
customers
WHERE
customers.cust_id = job.customer
GROUP BY
customer,
MONTH(job.collect_date)
You cannot do the order by price anymore. I'm sure you can make the table yourself?
No, people cannot write PHP themselves, and want an example:
// the sql command
$sql = "SELECT
customers.customer AS Customer,
MONTH(job.collect_date) AS Month,
sum(job.price) AS SumPrice
FROM
job,
customers
WHERE
customers.cust_id = job.customer
GROUP BY
customer,
MONTH(job.collect_date)";
// fetching data
if ($result = $mysqli->query($sql))
{
while($row = $result->fetch_assoc())
{
extract($row);
$data[$Customer][$Month] = $SumPrice;
}
$result->close();
}
// render
foreach($data as $customer => $prices)
{
echo $customer;
foreach($prices as $month => $price)
{
echo ' '.$price;
}
echo '<br>';
}
Note that the table rendering is the very basic, but it given you the idea, you need to work a bit on it to make it nicer. This will work regardless of which months are in the database. The main advantage is the simplicity of the SQL query.