psql question

Hi,

The following 'SELECT' query fails in psql, but it works
in Oracle sqlplus ...

mydb=# create table emp
mydb-# (firstname varchar(255),lastname varchar(255),empno int);
CREATE
mydb=# insert into emp (firstname,lastname,empno) values ('John','Doe',1234);

INSERT 44968 1
mydb=# select empno from emp where ((firstname,lastname) IN
mydb-# (('John','Doe'),('Joe','Blow')));
ERROR: parser: parse error at or near "'"
ERROR: parser: parse error at or near "'"

Whereas in sqlplus:

SQL> select empno from emp where ((firstname,lastname) IN
2 (('John','Doe'),('Joe','Blow')));

EMPNO
----------
1234

Can anyone tell me what syntax _will_ work in psql?

Many thx,
Mark