MySQL query get 0 if no result for day - php

Question

I am creating a line graph in flot, I have it all working except for the days which do not have a result I need them to come back with a result 0 + date. Is this possible in mysql? Here is my current query:
$chartQuery = "SELECT count(date) as counted_leads, UNIX_TIMESTAMP(date) as time FROM enquiries WHERE visibility != 'deleted' group by date";
Or would I need to do it in my php? Here is my code:
<?php
$last_key = end(array_keys($chartResults));
foreach ($chartResults as $item => $value)
{
$timestamp = round($value['time'] * 1000);
if ($item == $last_key)
{
// last element
echo '['.$timestamp.', '.htmlentities($value['counted_leads']).']';
}
else
{
// not last element
echo '['.$timestamp.', '.htmlentities($value['counted_leads']).'],';
}
}
unset($value);
?>

Answer 1

SELECT
ifnull(count(date),0) as counted_leads,
UNIX_TIMESTAMP(date) as time
FROM enquiries WHERE visibility != 'deleted'
group by date
Use if null for defult value

Answer 2

I think this is what you are looking for:
SELECT time, SUM(counted_leads) AS counted_leads
FROM(
SELECT UNIX_TIMESTAMP(date) AS time, count(1) AS counted_leads
FROM enquiries
WHERE visibility != 'deleted'
GROUP BY time
UNION ALL
SELECT a.Date AS time, 0 AS counted_leads
FROM (
SELECT CURDATE() - INTERVAL (a.a + (10 * b.a) + (100 * c.a)) DAY AS Date
FROM (SELECT 0 AS a UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) AS a
CROSS JOIN (SELECT 0 AS a UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) AS b
CROSS JOIN (SELECT 0 AS a UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) AS c
) a
WHERE a.Date BETWEEN (SELECT MIN(date) FROM enquiries) AND (SELECT MAX(date) FROM enquiries)
) a
GROUP BY time;