LEVEL, SYS_CONNECT_BY_PATH(last_name,'/') "Path"FROMemployeesWHERElevel<=3ANDdepartment_id=80STARTWITHlast_name='King'CONNECTBYPRIOR employee_id=manager_idANDLEVEL<=4; ERROR: ORA-01436:CONNECTBYloopinuserdata CONNECT BY 条件中的 NOCYCLE 参数使 Oracle 尽管有循环仍返回行。 CONNECT_BY_ISCYCLE ...
6、CONNECT_BY_ROOT的使用,oracle10g新增connect_by_root,用在列名之前表示此行的根节点的相同列名的值。 1SELECTLEVELAS等级,2CONNECT_BY_ISLEAFAS是否是叶子节点,3CONNECT_BY_ROOT ENAME,4LPAD('',LEVEL*2-1)||SYS_CONNECT_BY_PATH(ENAME,'=>'),5E.*6FROMEMP E7CONNECTBYPRIOR E.EMPNO=E.MGR8STARTWI...
6、CONNECT_BY_ROOT的使用,oracle10g新增connect_by_root,用在列名之前表示此行的根节点的相同列名的值。 1SELECTLEVELAS等级,2CONNECT_BY_ISLEAFAS是否是叶子节点,3CONNECT_BY_ROOTENAME,4LPAD(' ',LEVEL*2-1)||SYS_CONNECT_BY_PATH(ENAME,'=>'),5E.*6FROMEMPE7CONNECTBYPRIORE.EMPNO=E.MGR8STARTWITHE....
Easiest to use an example on emp. if we start with "where mgr is null", we generate the set of employees that have no mgr (they are the top of the tree). if we connect by prior empno = /* current */ mgr that will take all of the prior records (the start with at first) and...
ConnectBy、Level、StartWith的使用 ConnectBy、Level、StartWith的使⽤ORACLE--Connect By、Level、Start With的使⽤(Hierarchical query-层次查询)Syntax 1CONNECT BY [NOCYCLE] <condition> START WITH <condition> Syntax 2START WITH <condition> CONNECT BY [NOCYCLE] <condition> 参考⽹址:http://asktom....
三、start with ... connect by 用法讲解: 构建如下table: ID NAME PID 1 10 0 2 11 1 3 20 0 4 12 1 5 121 2 code example1: select TBL_TEST.*, level from TBL_TEST start with pid= 1 -- 可写到 connect by 后面 connect by prior pid = id ...
connect by prior foo = bar This construct establishes the recursion. All records that are part of the next lower hierarchical level are found by having bar = foo. foo is a value found in the current hierarchical level. A simple example ...
其中START WITH ID IN里面的值也可以替换SELECT子查询语句. 注意由上层向下层递归与下层向上层递归的区别在于START WITH...CONNECT BY PRIOR...的先后顺序以及ID = PID和PID = ID的微小变化! for example: 树结构查询语句(START WITH ...CONNECT BY PRIOR )问题 ...
I've a table with hierarchical data relationship (parent-child) contained in one table.How i can query the table and return the records sorted by its hierarchical level?To those who are familiar with Oracle, i'm looking for the same thing that 'Connect by' does....
Either type theOracleTNS name in theInstancetext box, or provide one of the followingOracleEasy Connect strings: The name of theOracleserver/Oracleservice name or ID For example, ifOracleis installed on myserver and myosvc is theOracleservice name, type the following: ...