Most commonly, includes multiple executable SQL statements,
    associated variable declarations, and control statements within
    a BEGIN . . . END block; however, each of these arguments is
    optional. For instance, you can create an empty BEGIN . . . END
    block (BEGIN END;).

    SQL executes the compound statement when the procedure in which
    it is embedded is called by a host language module. See the
    Oracle Rdb SQL Reference Manual for more complete information
    about a compound statement.