CODEWITHSUNDEEP
sqlsql-server-2008
Ganesamoorthy
Ganesamoorthy

Reputation: 3675

How to create composite primary key in SQL Server 2008

I want to create tables in SQL Server 2008, but I don't know how to create composite primary key. How can I achieve this?

Upvotes: 197

Views: 382765

Answers (8)

Fatih Mert Doğancan
Fatih Mert Doğancan

Reputation: 1092

For MSSQL Server 2012

CREATE TABLE usrgroup(
  usr_id int FOREIGN KEY REFERENCES users(id),
  grp_id int FOREIGN KEY REFERENCES groups(id),

  PRIMARY KEY (usr_id, grp_id)
)

UPDATE

I should add !

If you want to add foreign / primary keys altering, firstly you should create the keys with constraints or you can not make changes. Like this below:

CREATE TABLE usrgroup(
  usr_id int,
  grp_id int,

  CONSTRAINT FK_usrgroup_usrid FOREIGN KEY (usr_id) REFERENCES users(id),
  CONSTRAINT FK_usrgroup_groupid FOREIGN KEY (grp_id) REFERENCES groups(id),

  CONSTRAINT PK_usrgroup PRIMARY KEY (usr_id,grp_id)
)

Actually last way is healthier and serial. You can look the FK/PK Constraint names (dbo.dbname > Keys > ..) but if you do not use a constraint, MSSQL auto-creates random FK/PK names. You will need to look at every change (alter table) you need.

I recommend that you set a standard for yourself; the constraint should be defined according to the your standard. You will not have to memorize and you will not have to think too long. In short, you work faster.

Upvotes: 32

kevchadders
kevchadders

Reputation: 8335

Via Enterprise Manager (SSMS)...

  • Right Click on the Table you wish to create the composite key on and select Design.
  • Highlight the columns you wish to form as a composite key
  • Right Click over those columns and Set Primary Key

To see the SQL you can then right click on the Table > Script Table As > Create To

Upvotes: 57

FahadHussain
FahadHussain

Reputation: 7

CREATE TABLE UserGroup
(
  [User_Id] INT Foreign Key,
  [Group_Id] INT foreign key,

 PRIMARY KEY ([User_Id], [Group_Id])
)

Upvotes: -3

Ray K.
Ray K.

Reputation: 2521

I know I'm late to this party, but for an existing table, try:

ALTER table TABLE_NAME
ADD CONSTRAINT [name of your PK, e.g. PK_TableName] PRIMARY KEY CLUSTERED (column1, column2, etc.)

Upvotes: 37

Abhishek Jaiswal
Abhishek Jaiswal

Reputation: 1249

To create a composite unique key on table 

ALTER TABLE [TableName] ADD UNIQUE ([Column1], [Column2], [column3]);

Upvotes: -3

Sakthi Thanuskodi
Sakthi Thanuskodi

Reputation: 27

First create the database and table, manually adding the columns. In which column to be primary key. You should right click this column and set primary key and set the seed value of the primary key.

Upvotes: 1

Matthew Abbott
Matthew Abbott

Reputation: 61617

CREATE TABLE UserGroup
(
  [User_Id] INT NOT NULL,
  [Group_Id] INT NOT NULL

  CONSTRAINT PK_UserGroup PRIMARY KEY NONCLUSTERED ([User_Id], [Group_Id])
)

Upvotes: 187

Thilo
Thilo

Reputation: 262834

create table my_table (
     column_a integer not null,
     column_b integer not null,
     column_c varchar(50),
     primary key (column_a, column_b)
);

Upvotes: 264

Related Questions