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[英]How to get the first and last day of the last x (x = 3, 6 or 12) months in php?
[英]PHP - MYSQL: Last 12 months first to last day of each month
我参与的一个项目需要获得最近12个月中每个月的平均发票总额。 我可以通过执行12个查询(每个月1个查询)轻松地获得所需的信息,但是非常丑陋,我最终得到12个唯一变量(id而不是具有loop),而且我知道有更好的方法。
任何人都可以以最佳方式获得以下帮助:
SELECT AVG(invoice_total) FROM invoice WHERE date between '2015-01-01' AND '2015-01-31'
SELECT AVG(invoice_total) FROM invoice WHERE date between '2015-02-01' AND '2015-02-28'
SELECT AVG(invoice_total) FROM invoice WHERE date between '2015-03-01' AND '2015-03-31'
等等...
我将它们绘制在图表上,因此我每个月都需要一个数据点。
最终结果将是这样的:
Jan: $2323
Feb: $3523
March: $6453
等等...但将从当月的12个月前开始。
谢谢。
附注:为了方便起见,这是我最近90天的绘制方式:
$get_unconfirmed_appointments = "
SELECT total
, invoice_date
FROM invoice
WHERE clinic_id = 20
AND invoice_date >= '$date'
AND invoice_date <= '$date_two'
ORDER
BY invoice_date ASC
";
$result = $conn->query($get_unconfirmed_appointments) or die($conn->error.__LINE__);
while($row = $result->fetch_assoc()) {
$totals[$row['invoice_date']][] = $row['total'];
}
$sub_arrays = array_chunk($totals, 3);
foreach ($sub_arrays as $threedays) {
foreach ($threedays as $value) {
foreach ($value as $val) {
$all[] = $val;
}
}
$average = array_sum($all) / count($all);
$data_point=round($average,2);
plot($data_point);
}
我需要与上述相同的想法,但需要持续12个月。 每个月的平均值。
您可以使用MONTHNAME函数并按以下方式分组:
http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_month
您的SQL将是这样的:
SELECT AVG(invoice_total), MONTHNAME(invoice_date) FROM invoice WHERE invoice_date BETWEEN '2014-11-11' AND '2015-02-09' GROUP BY MONTHNAME(invoice_date)
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