joining two simular (but not identical tables)

I have two similar but not identical tables.
I would like to create a view that combines the contents of both tables
into a single view, where each record in each table is visible as a
separate record in the view.

table a
Column | Type | Modifiers
---------------+-----------------------+-----------
prcode | character varying(12) |
descr | character varying(55) |
rrp | numeric(10,5) |
sugcusmkdn | numeric(6,2) |
customerpr | numeric(7,2) |
costpr | numeric(11,6) |
lengths | character(1) |
profitpercent | numeric(6,2) |

table b
Column | Type | Modifiers
---------------+-----------------------+-----------
prcode | character varying(12) |
descr | character varying(55) |
rrp | numeric(10,5) |
customerpr | numeric(7,2) |
supdis | numeric(6,3) |
costpr | numeric(11,6) |
lengths | character(1) |
profitpercent | numeric(6,2) |
dnprice | numeric(7,2) |
stcode | character varying(18) |
dnprofit | numeric(5,2) |

Thanks for any help.

Regards Neil.