mysql怎么递归 mysql怎么递归查询 _递归

Mysql中怎么进行递归查询?概念说不一定理解，给你一个例子你自己参悟。
SELECT TEACHER
FROM C AS X
WHERE UNIQUE(SELECT TEACHER
FROM C AS Y
WHERE Y.TEACHER=X.TEACHER);
mysql foreach和递归查询嵌套怎么写？我给你举个递归查询嵌套的例子，你看一下就明白了。
【mysql怎么递归 mysql怎么递归查询】select yr_student_info.name from yr_student_info where yr_student_info.school_id in (select yr_school_info.id from yr_school_info where yr_school_info.province='上海' and yr_school_info.city='上海')
mysql 怎么实现sql的with递归概念说不一定理解mysql怎么递归，给mysql怎么递归你一个例子mysql怎么递归你自己参悟。SELECT TEACHER FROM C AS X WHERE UNIQUE(SELECT TEACHER FROM C AS Y WHERE Y.TEACHER=X.TEACHER);
php与mysql表中如何求递归求和汇总?function sumShuzi($tree, $updateData = https://www.04ip.com/post/array()) {
$sum = 0;
// foreach($tree as $key = $item) {//这句话有毒
foreach($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;
}
$tree = json_decode('[{"id":"1","Pid":"0","Pname_ch":"渠道部","Pshuzi":"1638000","children":[{"id":"4","Pid":"1","Pname_ch":"销售二部","Pshuzi":"895000","children":[{"id":"13","Pid":"4","Pname_ch":"周经理","Pshuzi":"28","children":[{"id":"28","Pid":"13","Pname_ch":"湖南","Pshuzi":"158000"},{"id":"35","Pid":"13","Pname_ch":"新疆","Pshuzi":"19000"}]},{"id":"40","Pid":"4","Pname_ch":"陈经理","Pshuzi":"5000"}]}]}]', true);
//$tree是具有父子关系的数据树
sumShuzi($tree, $updateData);
foreach ($updateData as $id = $item) {
$sql = "update your_table set Pshuzi={$item[0]} where id={$id}";
mysqli_query($db, $sql);//$db是你的数据库连接结果
}
mysql 实现递归查询，节点有多个[sql] view plain copy
CREATE FUNCTION `getChildList`(rootId INT)
RETURNS varchar(1000)
BEGIN
DECLARE sChildList VARCHAR(1000);
DECLARE sChildTemp VARCHAR(1000);
SET sChildTemp =cast(rootId as CHAR);
WHILE sChildTemp is not null DO
IF (sChildList is not null) THEN
SET sChildList = concat(sChildList,',',sChildTemp);
ELSE
SET sChildList = concat(sChildTemp);
END IF;
SELECT group_concat(id) INTO sChildTemp FROM user_role where FIND_IN_SET(parentid,sChildTemp)0;
END WHILE;
RETURN sChildList;
END;
[sql] view plain copy
/*获取子节点*/
[sql] view plain copy
mysql递归查询你这个表设计有问题，重设计个表pid为院系下级为班级
暂时想这么多，自己考虑吧
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mysql怎么递归 mysql怎么递归查询

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