start with 子句:遍历起始条件,有个小技巧,如果要查父结点,这里可以用子结点的列,反之亦然. connect by 子句:连接条件.关键词prior,prior跟父节点列parentid放在一起,就是往父结点方向遍历:prior跟子结点列subid放在一起,则往叶子结点方向遍历, parentid.subid两列谁放在“=”前都无所谓,关键是prior跟谁在一起. order by 子句:排序. select * from 表名 start with sell_roleid = con
查询基本结构: select … from table_name start with 条件1 connect by 条件2 1.建测试用表 create table test_prior( ids number, son ), father ) ); 并插入数据 start with指定树的根(即父节点)实际上你还可以指定多个根的,比如 father in ('爷爷', '爸爸') 而connect by prior son = father相当于表名在递归的过程中,查
如:select distinct dep_id from t_sys_dep_dimensions start with dep_id = (select dept_id from t_sys_person where mdm_user_id='#userId#') connect by nocycle prior dep_id = parent_dep_id ; 查找#userId#所在部门的子部门. START WITH 定义数据行查询的初始起点: nocycle 防止循环查找: CO
存储过程或函数可以返回集合类型,方法很多,今天整理在一个包中,其它情况可照猫画虎. CREATE OR REPLACE PACKAGE PKG_COLLECTION_LHR AUTHID CURRENT_USER AS ----------------------------------------------------------------------------------- -- Created on 2013-05-24 14:37:41 by lhr --Changed on 20
with ash as (select /*+ materialize*/* from DBA_HIST_ACTIVE_SESS_HISTORY where sample_time between timestamp '2015-03-18 15:00:00' and timestamp '2015-03-18 15:01:00'), chains as ( select session_id, level lvl, sys_connect_by_path