Hierarchical Queries If a table contains hierarchical data, then you can select rows in a hierarchical order using the hierarchical query clause 오라클에서만 사용할 수 있는 쿼리 계층형 정보를 표현하고자 오라클8부터 지원 [ 문법 ] START WITH condition1 CONNECT BY condition2 SELECT LPAD(' ', 2*(LEVEL-1)) || item_name item_names FROM BOM_SPHONE START WITH parent_id IS null CONNECT BY PRIOR item_id = parent_id START WITH condition1 c..