1 table-identifier 2? ( 2.1+ , 2.1 column-name 2.2 ) 3 AS ( fullselect ) 4? search-clause 5? cycle-clause search-clause 1 SEARCH 2 DEPTH FIRST 2 BREADTH FIRST 3 BY 4+ , 4 column-name 5 SET seq-column-name cycle-clause 1 CYCLE 2+ , 2 column-name 3 SET cycle-column-name TO constant DEFAULT constant 4? USING using-column-name