NEWID
Creates a unique value of type uniqueidentifier.
Syntax
NEWID ( )
Return Types
uniqueidentifier
Examples
A. Use the NEWID function with a variable
This example uses NEWID to assign a value to a variable declared as the uniqueidentifier data type. The value of the uniqueidentifier data type variable is printed before the value is tested.
-- Creating a local variable with DECLARE/SET syntax.
DECLARE @myid uniqueidentifier
SET @myid = NEWID()
PRINT 'Value of @myid is: '+ CONVERT(varchar(255), @myid)
Here is the result set:
Value of @myid is: 6F9619FF-8B86-D011-B42D-00C04FC964FF
Note The value returned by NEWID is different for each computer. This number is shown only for illustration.
B. Use NEWID in a CREATE TABLE statement
This example creates cust table with a uniqueidentifier data type, and uses NEWID to fill the table with a default value. In assigning the default value of NEWID(), each new and existing row has a unique value for the cust_id column.
-- Creating a table using NEWID for uniqueidentifier data type.
CREATE TABLE cust
(
cust_id uniqueidentifier NOT NULL
DEFAULT newid(),
company varchar(30) NOT NULL,
contact_name varchar(60) NOT NULL,
address varchar(30) NOT NULL,
city varchar(30) NOT NULL,
state_province varchar(10) NULL,
postal_code varchar(10) NOT NULL,
country varchar(20) NOT NULL,
telephone varchar(15) NOT NULL,
fax varchar(15) NULL
)
GO
-- Inserting data into cust table.
INSERT cust
(cust_id, company, contact_name, address, city, state_province,
postal_code, country, telephone, fax)
VALUES
(newid(), 'Wartian Herkku', 'Pirkko Koskitalo', 'Torikatu 38', 'Oulu', NULL,
'90110', 'Finland', '981-443655', '981-443655')
INSERT cust
(cust_id, company, contact_name, address, city, state_province,
postal_code, country, telephone, fax)
VALUES
(newid(), 'Wellington Importadora', 'Paula Parente', 'Rua do Mercado, 12', 'Resende', 'SP',
'08737-363', 'Brazil', '(14) 555-8122', '')
INSERT cust
(cust_id, company, contact_name, address, city, state_province,
postal_code, country, telephone, fax)
VALUES
(newid(), 'Cactus Comidas para Ilevar', 'Patricio Simpson', 'Cerrito 333', 'Buenos Aires', NULL,
'1010', 'Argentina', '(1) 135-5555', '(1) 135-4892')
INSERT cust
(cust_id, company, contact_name, address, city, state_province,
postal_code, country, telephone, fax)
VALUES
(newid(), 'Ernst Handel', 'Roland Mendel', 'Kirchgasse 6', 'Graz', NULL,
'8010', 'Austria', '7675-3425', '7675-3426')
INSERT cust
(cust_id, company, contact_name, address, city, state_province,
postal_code, country, telephone, fax)
VALUES
(newid(), 'Maison Dewey', 'Catherine Dewey', 'Rue Joseph-Bens 532', 'Bruxelles', NULL,
'B-1180', 'Belgium', '(02) 201 24 67', '(02) 201 24 68')
GO
C. Use uniqueidentifier and variable assignment
This example declares a local variable called @myid as a variable of uniqueidentifier data type. Then, the variable is assigned a value using the SET statement.
DECLARE @myid uniqueidentifier
SET @myid = 'A972C577-DFB0-064E-1189-0154C99310DAAC12'
GO