No,In the entire  table,there will be only one primary key.
A primary key is nothing but a collection of one or more 
coloumns  used to identify a row in a table.

yes any table has only one primary key.but the basic idea 
of pk is ....primary key=NOTNULL+UNIQUE KEY.which we can 
give any column to a table and act as primary key

yes, a table may have more than 1 primary keys but, of them
we only choose 1 column as identifiable column called
primary key. The other columns are called surrogate keys or
candidate key.

Yes we can use.  for Example

create table emp(empno number(5), ename varchar2(20), 
deptno number(5) add primary key Pk_constraint( empno, 
deptno))

no a table can have only one primary key.
u can make one or column to have primary key 
that is called a composite primary key


Dev
ddlamani@yahoo.com

A table can have Only One Primary key. But a table can have 
composite Primary key. that means we can create composite 
primary key 
upto 16 columns only.

suresh.
suresh_somayajula@hotmail.com

primary key is only and only one in a table.
it may be in more column in table means 
In one table --one primary key and more than one column on 
the same table

Hi
A table can have only one primary key.but a primary key can
have two column fields
Ex i have a employee table.and i have fields eno,ename,esal
i can declare primarykey(esal,ename)

let me know if i am wrong

A table can have only one primary key constraint but it can 
consist one or multiple columns.If a primary key is made up 
of more than one columns then it is know as composite 
primary key.

VD

create table emp
(empno varchar2(10) constraint empnopk primary key,
e_id varchar2(10) constraint eiduk unique not null);

Yes table can have two or more primary key,when we want to 
create more then one primary we use unique constranit with 
not null or we can create with triggre.

ya..it's possible when, a table contains more than one
fields. we can able to set the primary for two or more..

thanks.,

A Table can't have two primary key.

Yes table can have two or more primary key.

yes table can contain one or more than one primary keys 
but only one is considered as a primary key .

yes

No, a table should allows only one primary key with the 
properties of NOT NULL + UNIQUE  . But user can be able to 
give more than one primary keys in a table with the help of 
NOT NULL and UNIQUE KEYs but not directly using PRIMARY KEY 
constraint.

No, a table can have one and only one primary key.