--基数数据1 SELECT ID, 2 mt.materialtypename, 3 mt.parenttypeid 4 FROM material_type mt;
使用递归还是与LEVEL
1 SELECT ID, 2 mt.materialtypename, 3 mt.parenttypeid, 4 SUBSTR(SYS_CONNECT_BY_PATH(mt.materialtypename,‘->‘),3) DisplayLevel, 5 level 6 FROM material_type mt 7 START WITH nvl(mt.parenttypeid,0)=0 8 CONNECT BY PRIOR ID=mt.parenttypeid;
CONNECT BY 子句定义表的相互联系
START WITH 子句定义的开始起点
level 查询深度
时间: 2024-08-02 04:34:42