Oracle Connect By Prior用法(实现递归查询)
2011-12-02 11:03
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SQL: select id,pid,treename,url,treetype from web_menu_tree where roleid = 1 and delflag = 1 start with id = 1 connect by prior id = pid 表结构 -- Create table create table WEB_MENU_TREE ( ID NUMBER not null, PID NUMBER, TREENAME VARCHAR2(200), URL VARCHAR2(200), ROLEID NUMBER, TREETYPE NUMBER, ORDERNUM NUMBER, DELFLAG NUMBER, CREATETIME DATE default SYSDATE ) tablespace IBM_DATA pctfree 10 initrans 1 maxtrans 255 storage ( initial 64K minextents 1 maxextents unlimited ); start with...connect by prior子句用法 connect by 是结构化查询中用到的, 基本语法是: select * from tablename start with 条件1 connect by 条件2 where 条件3; 最近在写一棵目录树的时候,由于设计时表结构设计的不是特别好,所以只有采用递归查询来处理 顺便请教了我们公司的Oracle DB大师的精典写法,了解一下吧,好处不少。很多地方可以用得到。
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