Mysql and php sum of values from colum depending on date

Question

I have a MYSQL table structured like this:

1st column: id;

2nd column: date;

3rd column: integer value;

The date can vary from 2010-01-01 to 2014-12-20 for example.

In the PHP code i have defined two variables in "Ymd" format , let's say the values are:

$first_date = "2011-10-17"

$last_date = "2014-11-04"

How can I get the sum of the values from the 3rd column for each month in the interval defined by the $first_date and $last_date ?

Answer 1

You would do a SQL query like this:

select date_format(date, '%Y-%m') as yyyymm, sum(value)
from table t
where date between $first_date and $second_date
group by date_format(date, '%Y-%m')
order by yyyymm;

I would recommend that you parameterize the query rather than putting the variables directly into the SQL string.