How do I create a foreign key in SQL Server? -

i have never "hand-coded" object creation code sql server , foreign key decleration seemingly different between sql server , postgres. here sql far:

drop table exams; drop table question_bank; drop table anwser_bank;  create table exams (     exam_id uniqueidentifier primary key,     exam_name varchar(50), ); create table question_bank (     question_id uniqueidentifier primary key,     question_exam_id uniqueidentifier not null,     question_text varchar(1024) not null,     question_point_value decimal,     constraint question_exam_id foreign key references exams(exam_id) ); create table anwser_bank (     anwser_id           uniqueidentifier primary key,     anwser_question_id  uniqueidentifier,     anwser_text         varchar(1024),     anwser_is_correct   bit ); 

when run query error:

msg 8139, level 16, state 0, line 9 number of referencing columns in foreign key differs number of referenced columns, table 'question_bank'.

can spot error?

create table question_bank (     question_id uniqueidentifier primary key,     question_exam_id uniqueidentifier not null,     question_text varchar(1024) not null,     question_point_value decimal,     constraint fk_questionbank_exams foreign key (question_exam_id) references exams (exam_id) );