DROP-SEQUENCE — Drop a database sequence.Function
nameThe name of the sequence as a string, symbol or SQL expression.
databaseA database object which defaults to *default-database*.
if-does-not-existA symbol. Meaningful values are :ignore or :error (the default).
Drops the sequence called name from
      database which defaults to
      *default-database*. If the sequence does not
      exist and if-does-not-exist is
      :ignore then
      drop-sequence returns NIL whereas an
      error is signalled if if-does-not-exist
      is :error.
      
(sequence-exists-p [foo])
=> T
(drop-sequence [foo] :if-does-not-exist :ignore)
=> 
(sequence-exists-p [foo])
=> NIL        
      
        An error is signalled if name is not a
        string, symbol or SQL expression. An error of type
        sql-database-data-error is signalled if
        name doesn't exist and
        if-does-not-exist has a value of
        :error.