PRIMARY KEY (cust_id) : Primary Key « Constraints « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Constraints » Primary Key 
7. 2. 4. PRIMARY KEY (cust_id)
2CREATE TABLE customer
3(
4> cust_id      int          IDENTITY  NOT NULL,
5> cust_name    varchar(30)  NOT NULL,
6>                           PRIMARY KEY (cust_id)
7)
8> GO
1>
2> EXEC sp_helpconstraint customer
3> GO
Object Name



--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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customer




constraint_type                                                                                                                                    constraint_name
                                                                            delete_action update_action status_enabled status_for_replication constraint_keys











-------------------------------------------------------------------------------------------------------------------------------------------------- -----------------------------------------------------
--------------------------------------------------------------------------- ------------- ------------- -------------- ---------------------- ----------------------------------------------------------
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------------------------
PRIMARY KEY (clustered)                                                                                                                            PK__customer__3C00B29C
                                                                            (n/a)         (n/a)         (n/a)          (n/a)                  cust_id












No foreign keys reference table 'customer', or you do not have permissions on referencing tables.
1>
2> drop table customer;
3> GO
7. 2. Primary Key
7. 2. 1. Primary Key Constraint
7. 2. 2. The PRIMARY KEY Clause
7. 2. 3. Define constraint name for primary key
7. 2. 4. PRIMARY KEY (cust_id)
7. 2. 5. You cannot add another primary key to table
7. 2. 6. NONCLUSTERED PRIMARY KEY
7. 2. 7. Using a Multicolumn Primary Key
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