Question

我有一个php函数来获取morris饼图的日期，它运行正常。

但现在我有更多数据（去年和今年前3个月的日期）。它现在显示重复的月份。在这种情况下，去年2月和今年的数据现在显示在同一个饼图上。

我想在php中编写一些mysql代码，只显示过去12个月。我有以下代码：

function writesql($rec) {
$year = date('Y') -1;
$month = date('m');
$lastyear = $year - $month; // I know this is a problem.It's subtracting the two variables

$sql = "";
$sql = $sql . " SELECT";
$sql = $sql . " YEAR(`value`)as 'Year',";
$sql = $sql . " MONTH(`value`)as 'Month',";
$sql = $sql . " `value` , ";
$sql = $sql . " COUNT(`value`) as 'Calls' ,";
$sql = $sql . " ROUND(SUM( `value` ),2) as 'Value'";
$sql = $sql . " FROM `table`";
$sql = $sql . " GROUP BY";
$sql = $sql . " YEAR(`value`),";
$sql = $sql . " MONTH(`value`)" ;
$sql = $sql . " ORDER BY";
$sql = $sql . " YEAR(`value`),";
$sql = $sql . " MONTH(`value`)";
$sql = $sql." WHERE (`value`)='".$lastyear."'";// I also know this is wrong too but im lost as to how to fix it.

return $sql;
}

然后其余部分如下，我只想获取过去12个月的数据，我应该如何执行此操作。

Answer 1

你可以WHERE value >= DATE_SUB(CURDATE(),INTERVAL 1 YEAR);

这将显示截至当前日期的12个月。

Answer 2

你很亲密。进行这些更改

$year = date('Y') -1; // This will give last year

$sql." WHERE YEAR(`value`)='".$year."'"

更新了查询

$sql = "
SELECT YEAR(`value`) as 'Year', MONTH(`value`) as 'Month', `value`,
COUNT(`value`) as 'Calls', ROUND(SUM( `value` ),2) as 'Value'
FROM `table`
WHERE YEAR(`value`) = '$year'
GROUP BY YEAR(`value`), MONTH(`value`)
ORDER BY YEAR(`value`), MONTH(`value`)";

Answer 3

首先，我发现这更容易阅读：

    $sql = "
    SELECT YEAR(value) Year
         , MONTH(value) Month 
         , value
         , COUNT(value) Calls
         , ROUND(SUM(value),2) Value
      FROM `table`
     GROUP 
        BY YEAR(value)
         , MONTH(value)
     ORDER 
        BY YEAR(value)
         , MONTH(value)
     WHERE (value) = '".$lastyear."'
     ";

但是这个查询在语法上是不正确的。所以这是一个语法正确的版本：

$sql = "
SELECT YEAR(`value`) Year
     , MONTH(`value`) Month 
     , COUNT(value) Calls
     , ROUND(SUM(value),2) Total_Value
  FROM `table`
 WHERE value = '".$lastyear."'
 GROUP 
    BY YEAR(value)
     , MONTH(value)
 ORDER 
    BY YEAR(value)
     , MONTH(value);
 ";

现在查看准备和绑定查询

php和mysql查询获取过去12个月的日期

3 个答案: