Creating a UNIQUE Constraints when creating a table : Unique « Constraints « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Constraints » Unique

7. 10. 6. Creating a UNIQUE Constraints when creating a table


5>

6>    CREATE TABLE Shippers

7>    (

8>       ShipperID     int    IDENTITY    NOT NULL

9>          PRIMARY KEY,

10>       ShipperName   varchar(30)        NOT NULL,

11>       Address       varchar(30)        NOT NULL,

12>       City          varchar(25)        NOT NULL,

13>       State         char(2)            NOT NULL,

14>       Zip           varchar(10)        NOT NULL,

15>       PhoneNo       varchar(14)        NOT NULL

16>          UNIQUE

17>    )

18>    GO

1>

2>    drop table Shippers;

3>    GO

7. 10. Unique
	7. 10. 1.	Adding a UNIQUE Constraint to an Existing Table
	7. 10. 2.	Unique constraints will also allow one NULL, whereas primary keys will not.
	7. 10. 3.	Unique Constraint: Enforce uniqueness on a column which is not the column used to primarily identify each row.
	7. 10. 4.	Unique constraints can be created when initially creating the table or added after.
	7. 10. 5.	Unique constraint
	7. 10. 6.	Creating a UNIQUE Constraints when creating a table
	7. 10. 7.	Creating UNIQUE Constraints on Existing Tables

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