在php中怎樣將數(shù)據(jù)庫(kù)中文本型數(shù)據(jù)求和

可以直接使用mysql的sum函數(shù)求和,mysql會(huì)自動(dòng)轉(zhuǎn)換為數(shù)字型進(jìn)行求和.

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如何在PHP中顯示數(shù)據(jù)庫(kù)中的求和函數(shù)計(jì)算出的值

php+mysql,

舉個(gè)例子

...........省略數(shù)據(jù)庫(kù)連接3步驟

$sql

=

"select

sum(price)

from

table";

//查詢price字段下所有值的和

$query

=

mysql_query($sql);

//執(zhí)行sql語(yǔ)句

$result

=

mysql_fetch_row($query);

//取得搜索結(jié)果中的數(shù)據(jù)(一個(gè)數(shù)組)

echo

$result[0];

//

數(shù)組中只有一條數(shù)據(jù),所以索引

就可以了

echo就是顯示啦,

希望能幫到你

php 數(shù)據(jù)庫(kù) 求和

SELECT SUM(分?jǐn)?shù)) FROM 表a WHERE 性別='男'

SELECT SUM(分?jǐn)?shù)) FROM 表a WHERE 性別='女'

----測(cè)試

CREATE TABLE MASK_TEST(

ID INT,

姓名 varchar(20),

性別 varchar(20),

年齡 int,

分?jǐn)?shù) int

)

INSERT INTO MASK_TEST VALUES(11,'ZHANG SAN','男',20,88)

INSERT INTO MASK_TEST VALUES(11,'LIU SHAN','女',20,83)

INSERT INTO MASK_TEST VALUES(11,'WANG SAN','男',20,87)

INSERT INTO MASK_TEST VALUES(11,'ZHANG TING','女',20,83)

INSERT INTO MASK_TEST VALUES(11,'ZHAO YAN','女',20,88)

INSERT INTO MASK_TEST VALUES(11,'ZHOU HU','男',20,78)

INSERT INTO MASK_TEST VALUES(11,'WANG QIANG','男',20,98)

INSERT INTO MASK_TEST VALUES(11,'LI QIAN','女',21,68)

SELECT SUM(分?jǐn)?shù)) FROM MASK_TEST WHERE 性別='男'

SELECT SUM(分?jǐn)?shù)) FROM MASK_TEST WHERE 性別='女'

----結(jié)果：

(1 行受影響)

(1 行受影響)

(1 行受影響)

(1 行受影響)

(1 行受影響)

(1 行受影響)

(1 行受影響)

(1 行受影響)

-----------

351

(1 行受影響)

-----------

322

(1 行受影響)

php與mysql表中如何求遞歸求和匯總?

function?sumShuzi($tree,?$updateData?=?array())?{

$sum?=?0;

//?foreach($tree?as?$key?=?$item)?{??//這句話有毒

foreach($tree?as?$key?=?$item)?{

if(isset($item['children']))?{

$oldPshuzi?=?$tree[$key]['Pshuzi'];

$tree[$key]['Pshuzi']?=?sumShuzi($item['children'],?$updateData);

if($oldPshuzi?!=?$tree[$key]['Pshuzi'])?{

$updateData[$item['id']]?=?array($tree[$key]['Pshuzi'],?$tree[$key]['Pname_ch']);

}

}

$sum?+=?$tree[$key]['Pshuzi'];

}

return?$sum;

}

$tree?=?json_decode('[{"id":"1","Pid":"0","Pname_ch":"\u6e20\u9053\u90e8","Pshuzi":"1638000","children":[{"id":"4","Pid":"1","Pname_ch":"\u9500\u552e\u4e8c\u90e8","Pshuzi":"895000","children":[{"id":"13","Pid":"4","Pname_ch":"\u5468\u7ecf\u7406","Pshuzi":"28","children":[{"id":"28","Pid":"13","Pname_ch":"\u6e56\u5357","Pshuzi":"158000"},{"id":"35","Pid":"13","Pname_ch":"\u65b0\u7586","Pshuzi":"19000"}]},{"id":"40","Pid":"4","Pname_ch":"\u9648\u7ecf\u7406","Pshuzi":"5000"}]}]}]',?true);

//$tree是具有父子關(guān)系的數(shù)據(jù)樹(shù)

sumShuzi($tree,?$updateData);

foreach?($updateData?as?$id?=?$item)?{

$sql?=?"update?your_table?set?Pshuzi={$item[0]}?where?id={$id}";

mysqli_query($db,?$sql);????//$db是你的數(shù)據(jù)庫(kù)連接結(jié)果

}