How do I make a composite key with SQL Server Management Studio?
- Open the design table tab
- Highlight your two INT fields (Ctrl/Shift+click on the grey blocks in the very first column)
- Right click -> Set primary key
here is some code to do it:
-- Sample Tablecreate table myTable ( Column1 int not null, Column2 int not null)GO-- Add ConstraintALTER TABLE myTable ADD CONSTRAINT pk_myConstraint PRIMARY KEY (Column1,Column2)GOI added the constraint as a separate statement because I presume your table has already been created.
create table my_table ( id_part1 int not null, id_part2 int not null, primary key (id_part1, id_part2))