Question

我的数据存储在我的MySQL（paid）中。我需要对列进行总结。

$sql= "SELECT SUM(furniture) FROM paid"; 
$stmt = $connect->prepare($sql);
$stmt->execute();
$furniture = (int) $stmt->fetchColumn();

$sql= "SELECT SUM(groceries) FROM paid"; 
$stmt = $connect->prepare($sql);
$stmt->execute();
$groceries = (int) $stmt->fetchColumn();

//so on....

数据库中有morthan 50列。我的问题是，有没有更短的方法来写这个，所以我可以获得每列的SUM并将其分配给变量？

Answer 1

尝试单一查询

$sql = "SELECT  SUM(`furniture`) AS sumFurniture, 
                SUM(`groceries`) AS sumGroceries ,
                ...
        FROM `paid` ";

结果可以通过

获得

$sth = $connect->prepare($sql);
$sth->execute();
$result = $sth->fetch();

$sumFurniture = $result['sumFurniture'];
$sumGroceries = $result['sumGroceries'];
....

Answer 2

您可以将它们组合为单个SQL查询

SELECT SUM(furniture) AS furniture, SUM(groceries) AS groceries....... FROM paid

Answer 3

如果您的r子句相同，您可以像这样组合查询：

where

从php，您可以获取它：使用数组索引＆＃34; column_name1＆＃34;，＆＃34; column_name2＆＃34;

总和多个列

3 个答案: