how do I make a composite key with SQL Server Management Studio?

问题

how do I make a composite key with SQL Server Management Studio?

I want two INT columns to form the identity (unique) for a table

回答1:

1. Open the design table tab
2. Highlight your two INT fields (Ctrl/Shift+click on the grey blocks in the very first column)
3. Right click -> Set primary key

回答2:

here is some code to do it:

-- Sample Table
create table myTable 
(
    Column1 int not null,
    Column2 int not null
)
GO

-- Add Constraint
ALTER TABLE myTable
    ADD CONSTRAINT pk_myConstraint PRIMARY KEY (Column1,Column2)
GO

I added the constraint as a separate statement because I presume your table has already been created.

回答3:

create table my_table (
    id_part1 int not null,
    id_part2 int not null,
    primary key (id_part1, id_part2)
)

回答4:

In design mode (right click table select modify) highlight both columns right click and choose set primary key

回答5:

Open up the table designer in SQL Server Management Studio (right-click table and select 'Design')

Holding down the Ctrl key highlight two or more columns in the left hand table margin

Hit the little 'Key' on the standard menu bar at the top

You're done..

:-)

回答6:

Highlight both rows in the table design view and click on the key icon, they will now be a composite primary key.

I'm not sure of your question, but only one column per table may be an IDENTITY column, not both.

回答7:

create table myTable 
(
    Column1 int not null,
    Column2 int not null
)
GO


ALTER TABLE myTable
    ADD  PRIMARY KEY (Column1,Column2)
GO

来源：https://stackoverflow.com/questions/1545571/how-do-i-make-a-composite-key-with-sql-server-management-studio