::= | '(' ')' | '(' ')' ::= 'ISTREAM' | 'DSTREAM' | 'RSTREAM' ::= ::= 'SELECT' 'DISTINCT' | 'SELECT' | 'SELECT' 'DISTINCT' '*' | 'SELECT' '*' ::= 'FROM' ::= 'WHERE' | ::= 'GROUP' 'BY' | ::= ',' | ::= | ::= 'COUNT' '(' ')' | 'COUNT' '(' '*' ')' | 'SUM' '(' ')' | 'AVG' '(' ')' | 'MAX' '(' ')' | 'MIN' '(' ')' ::= '.' | ::= ',' | ::= ',' ::= '[' ']' | '[' ']' 'AS' | | 'AS' ::= 'RANGE' | 'NOW' | 'ROWS' | 'RANGE' 'UNBOUNDED' | 'PARTITION' 'BY' 'ROWS' ::= | 'SECOND' | 'MINUTE' | 'HOUR' | 'DAY' ::= 'AND' | ::= '<' | '<=' | '>' | '>=' | '=' | '!=' ::= | | '+' | '-' | '*' | '/' | '( ')' ::= '"' '"' | | ::= 'UNION' 'EXCEPT'