[SQL][Oracle] 계층적 쿼리(START WITH, CONNECT BY PRIOR)

#SQL,#SQLORACLE,#SQL계층형,#계층형데이터,#SYS_CONNECT_BY_PATH,#CONNECT_BY,#SQLCONNECTBY,#SQL계층,#SQL계층형질의,#SQL계층적질의,#SQL계층데이터,#오라클계층형,#오라클계층데이터,#CONNECT_BY_ISLEAF,#SQLLEVEL