syntax 1 connect by [nocycle] start with syntax 2 start with connect by [nocycle] 实验之:scott用户下emp表 SQL> select * from emp; EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO ---------- ---------- --------- ----------
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.oracle.com/pls/asktom/f?p=100...
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。 1 SELECT LEVEL AS 等级, 2 CONNECT_BY_ISLEAF AS 是否是叶子节点, 3 CONNECT_BY_ROOT ENAME, 4 LPAD(' ', LEVEL * 2 - 1) || SYS_CONNECT_BY_PATH(ENAME, '=>'), 5 E.* 6 FROM EMP ...
Input-CONNECT BYOutputInput - CONNECT BY multiple tablesThe syntax shows the relationship between each child row and its parent row. It uses the CONNECT BY xxx PRIOR clau
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.oracle.com/pls/asktom/f?p=100:11:0:::P11_QUESTION_ID:489772591421 http...
可见是全部level的树形结构,当扫描对象是dual时,即一个level只生成一条记录. 二、如何解决from dual只显示100行的问题: selectlevel from dual connectbylevel <=300 只显示100行,但据说只是9i的显示问题,解决方法如下: select * from (level from dual connectbylevel <=300) ...
4、SYS_CONNECT_BY_PATH Oracle 9i提供了sys_connect_by_path(column,char),其中column 是字符型或能自动转 换成字符型的列名。它的主要目的就是将父节点到当前节点的”path”按照指定的模式展现出现。这个函数只能使用在层次查询中。 1SELECTLEVELAS等级,2CONNECT_BY_ISLEAFAS是否是叶子节点,3LPAD('',LEVEL*2...
syntax: select ... [start with initial-condition] connect by [nocycle] recurse-conditionlevel With level it is possible to show the level in the hierarchical relation of all the data.--oracle 9i sys_connect_by_path With sys_connect_by_path it is possible to show the entire path from ...
syntax: select ... [start with initial-condition] connect by [nocycle] recurse-condition level With level it is possible to show the level in the hierarchical relation of all the data. --oracle 9i sys_connect_by_path With sys_connect_by_path it is possible to show the entire path from...
可以通过运行以下命令打开Tablefunc：如Stradas I报告查询所示：例如，我们在PostgreSQL中有一个表，它的...