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Home Backend Development PHP Tutorial 怎么才能把数据库的中的数据以一个条件查询出来,然后统计里面的另一个字段中存的数据累加一共是多少.

怎么才能把数据库的中的数据以一个条件查询出来,然后统计里面的另一个字段中存的数据累加一共是多少.

May 21, 2018 am 11:43 AM

有这样一个要求,就是我要先把润安大厦显示出来,然后再统计润安大厦 一共领取了多少台电脑    

回复讨论(解决方案)

读取时自己累加就是了

读取时自己累加就是了  
麻烦您说的具体点...谢谢了!

	$sql="select sum(number) as total where where area='润安大厦'";	
	$result=mysql_query($sql);	
	while($row=mysql_fetch_array($result)){		
	$total=$row['total'];	
	}	
	echo "润安大厦:".$total."台";
Copy after login
Copy after login

还要怎么具体呢?
有数组
array(
array('a', 1),
array('a', 2),
array('b', 1),
array('c', 1),
array('a', 1),
)
现要求按第一列分别对第二列求和,你说该如何做?

还要怎么具体呢?
有数组
array(
array('a', 1),
array('a', 2),
array('b', 1),
array('c', 1),
array('a', 1),
)
现要求按第一列分别对第二列求和,你说该如何做?

		$query = "select * from tbl_apply_register where area = '润安大厦'";		
		$sql = mysql_query($query);		
		while($row = mysql_fetch_array($sql)){			
		$tmp[] = $row[number];			
		}		
		echo array_sum($tmp);
Copy after login
Copy after login

	$sql="select sum(number) as total where where area='润安大厦'";	
	$result=mysql_query($sql);	
	while($row=mysql_fetch_array($result)){		
	$total=$row['total'];	
	}	
	echo "润安大厦:".$total."台";
Copy after login
Copy after login
		$query = "select * from tbl_apply_register where area = '润安大厦'";		
		$sql = mysql_query($query);		
		while($row = mysql_fetch_array($sql)){			
		$tmp[] = $row[number];			
		}		
		echo array_sum($tmp);
Copy after login
Copy after login

$sql="select sum(number) as total where  where area='润安大厦'";  
不好意思,多了个where  
你的方法跟我的本质相同,不过我的是在数据库中直接算出来。

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