statement 

<statement> ::=
  BEGIN <statement_list> END
| BREAK
| CONTINUE
| CONTINUE EXECUTE
| <if_statement>
| <while_statement>
| <assignment_statement>
| <case_statement>
| <RETURN> [<expression>]
| STOP (<expression> [,<expression>] )
| TRY <statement_list>; CATCH <statement>
| <routine_sql_statement>