I have a MySql table 'Products' with three columns:
Date | Product | Qty
My aim is to SUM the qty of each product for every week.
Getting the SUM between two given dates would be easy:
SELECT SUM(qty) FROM products WHERE date >= '2010-01-01' AND date < '2011-01-1'
I can generate a list of weeks in Php using something like:
$today = date('Y-m-d', strtotime('last week Monday'));
$future = date('Y-m-d', strtotime('+90 days'));
$period = new DatePeriod(
new DateTime($today),
new DateInterval('P7D'),
new DateTime($future)
);
foreach ($period as $key => $value) {
$dates .= $value->format('Y-m-d');
}
Is there a MySql query that would work to Group By and SUM by dates? Or would I be better off looping through in Php?
您可以通过类似的组来实现
GROUP BY week(date)
GROUP BY也是如此
SELECT SUM(qty) FROM products GROUP BY WEEK(date);
Year()
and Week()
functions in MySQL, to get the year and week number for a given date. Week()
function will return week number from 0 to 53. So, you will be needed to use Year()
function alongwith, if you have data spanning over multiple years. DayOfWeek()
. It returns the weekday index for a given date ( 1 = Sunday, 2 = Monday, …, 7 = Saturday ) Date_Add()
function using the weekday index value and the actual date value, to determine the starting week date and ending week date for a given date. Try the following ( if the Week starts on Sunday ) :
SELECT
DATE_ADD(`date`, INTERVAL(1 - DAYOFWEEK(`date`)) DAY) AS week_start_date,
DATE_ADD(`date`, INTERVAL(7 - DAYOFWEEK(`date`)) DAY) AS week_end_date,
SUM(qty)
FROM
products
GROUP BY week_start_date, week_end_date
If the week starts on Monday, another handy function is WeekDay()
. It returns the weekday index for date ( 0 = Monday, 1 = Tuesday, … 6 = Sunday ).
Try the following ( if the Week starts on Monday ) :
SELECT
DATE_ADD(`date`, INTERVAL(0 - WEEKDAY(`date`)) DAY) AS week_start_date,
DATE_ADD(`date`, INTERVAL(6 - WEEKDAY(`date`)) DAY) AS week_end_date,
SUM(qty)
FROM
products
GROUP BY week_start_date, week_end_date
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