sql server unique key for each partition -

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i have table contain 3 columns:

id int [primary key]

branchref int [foreign key]

code int

i need [code] unique in each [branchref]

like:

id      branchref      code 1           1            1 2           1            2 3           2            1 4           2            2 5           1            3

i appreciate help

add unique constraint.

alter table mytable add constraint unique(branchref, code);

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