Oracle:connect by对应with recursive(递归查询) oracle的start with … connect by …prior start with 决定在哪个节点开始(决定哪个节点是根节点) prior 决定了上下查询,如果prior指向子节点则向下查询,如果指向父节点则向上查询 具体参考初步认识、常见问题、细节参考 pgsql的with recusive,如下: 建表 create table...
start with connect by prior 递归查询用法 这个子句主要是用于B树结构类型的数据递归查询,给出B树结构类型中的任意一个结点,遍历其最终父结点或者子结点。 先看原始数据: create table a_test ( parentid varchar2(10), subid varchar2(10)); insert into a_test values ( '1', '2' ); insert into.....
编号 具体的函数差异就不一一列举,关于树的递归查询,ORACLE提供了START WITH ... CONNECT BY PRIOR ...函数,MYSQL没有提供对应函数,我们用一个存储过程解决MYSQL递归遍历树的问题: CREATE DEFINER = `skpdb`@`%` FUNCTION `getChildList`(rootId VARCHAR(32)) RETURNS varchar(1000) BEGIN DECLARE pTemp VARCHA...
startwitha.id=450--需替换成自己希望查询的id connectbypriora.id = a.parentid 2、由子级递归父项 1 2 3 4 selecta.id,a.parentid,a.text fromtreeview a startwitha.id=450--需替换成自己希望查询的id connectbypriora.parentid = a.id 三、PostgreSQL中的写法 1、由父项递归下级 1 2 3 4 5 ...
start with connect by prior 递归查询用法 这个子句主要是用于B树结构类型的数据递归查询,给出B树结构类型中的任意一个结点,遍历其最终父结点或者子结点。 先看原始数据: create table a_test ( parentid varchar2(10), subid varchar2(10)); insert into a_test values ( '1', '2' ); insert into.....
pg9.x版本可以用函数string_agg实现 1 selectstring_agg(bm,'.')ascodePathfromtable oracle使用listagg函数实现 1 2 3 4 selectlistagg(bm,'.') WITHINGROUP(ORDERBYbm)ascxmlj fromtable startwithbm ='150203740000' connectbypriorssjgid = zzjgid...
那么,对于下面例子: SELECT * FROMt1,t2 WHEREt1.a=1 ort1.a=t2.a andt1.b=t2.b ort1.c in (SELECTt3.c FROMt3) START WITHt1.c=1 CONNECT BY PRIORt2.c=t1 来自:帮助中心 查看更多 → 华为人工智能工程师培训 low2.0实战 深度学习预备知识 介绍学习算法,机器学习的分类、整体流程、常见算法,...
None, the default, meaning that an attempt will be made to connect over SSL, but if this is rejected by the server then pg8000 will fall back to using a plain socket. True, means use SSL with an ssl.SSLContext with the minimum of checks. False, means to not attempt to create an ...
7th Edition of PGAV’s Voice of the Visitor (VOV 2022) - Lets evaluate the prior year’s industry performance and look forward to the coming year. Read More → Living Live Events Nov 3, 2021 “You Can Only Be Funny When You Are Not In Pain” And Other Good Things To Know To...
CONNECT BY-Klausel Beispiele für Unterabfragen Korrelierte Unterabfragen SELECT INTO SET SET SESSION AUTHORIZATION SET SESSION CHARACTERISTICS SHOW SHOW COLUMNS SHOW EXTERNAL TABLE SHOW DATABASES SHOW MODEL SHOW DATASHARES SHOW PROCEDURE SHOW SCHEMAS SHOW TABLE SHOW TABLES SHOW VIEW START TRANSACTION TRU...