mysql - SQL. Unique and Primary Key -


my requirement having table of products cannot have similar vendor, product , version @ same time.

but, want table referenced on table primary key, distinct vendor, product version use unique.

create table products     (     vendor varchar(100),     product varchar(100),     version varchar(30),     unique (vendor, product, version, cve)         );

but way cannot reference product_id, want in table:

create table product_cve(      product_id int,     cve varchar(14),     foreign key (product_id) references products(product_id),     foreign key (cve) references vulnerabilitiescve(cve) );

, thing can that

   create table products     (     product_id int not null auto_increment,     vendor varchar(100),     product varchar(100),     version varchar(30),     primary key (product_id)      );

this way, going end having duplicated products...

the solution simple:

create table products     (     product_id int auto_increment     vendor varchar(100),     product varchar(100),     version varchar(30),     unique(vendor, product, version, cve),     primary key (product_id)         );

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