create ( ) - create a new relation insert - insert tuples into a relation delete ; - delete tuples from relations update from ; - update tuples within a relation print [] from [] ; - print tuples sort by ; - sort a relation file import into - import tuples from a file export [] ; - export tuples to a file extract [] ; - extract definition to a file compress - compress a relation file define - define a macro exit - exit SDB ::= using ::= into ::= ::= [where ] ::= ::= s> ::= [ .] ::= * | s> ::= { ascending | descending } ::= s>