[SQL] sql foregein key

[GANESH KUMAR]

sir ,

    i am working 6.5.2 postgresql 
in creation foregein key in table 

syntax i am writing is
1)create table gk
(sno  int primary key);

2)create table kk
(sno int references gk,
sname varchar(2));
i am getting message like this foregein key is not
implemented .
please write which version it supports .
please send reply assp

ganesh 

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