foreign key not null constraint

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1
2create table orders
3(
4        ord_no numeric (5) ,
5
6        purch_amt decimal(8,2),
7
8        ord_date date,
9
10        customer_id numeric (5) ,
11        
12        salesman_id numeric(5) 
13        
14        foreign key(salesman_id)
15
16        references salesman (salesman_id)
17)
18go

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foreign key not null should we use foreign key as not null sql set fk key not null how to alter foreign key from null to not null in sql foreign key constraint set null foreign key not null constraint query doesn 27t work if foreign key is null foreign key not null constraint