一个查询树状结构的语句
SELECT 1,LEVEL,LNAME,NULL,CODE
FROM PRDGP CONNECT BY PRIOR CODE = P_CODE
START WITH P_CODE IS NULL
说明：P_CODE为父级，CODE为子集，P_CODE为空时为树的最顶级，即为Start with 起点，递归方式为CODE = P_CODE,LEVEL为树的等级
SELECT CODE,LNAME,CNAME
FROM PRDGP WHERE CODE <> 'LBL' AND TYPE= 'GMT' CONNECT BY PRIOR CODE=PARENTGRP AND PARENTGRP <> 'LBL'
START WITH PARENTGRP IS NULL ORDER BY CODE
posted on 2008-12-10 15:56
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Oracle