Oracle递归查询(树型查询)

SELECT T.AREA_CODE, T.AREA_NAME, T.AREA_LEVEL
  FROM TBL_SYS_AREA_CODE T
CONNECT BY PRIOR T.AREA_CODE = T.PARENT_AREA_CODE
 START WITH T.PARENT_AREA_CODE = ‘父级‘;

SELECT T.AREA_CODE, T.AREA_NAME, T.AREA_LEVEL
  FROM TBL_SYS_AREA_CODE T
CONNECT BY  T.AREA_CODE = PRIOR T.PARENT_AREA_CODE
 START WITH T.Area_Name = ‘子级‘;