Summary: in this tutorial, you will learn about the SQL Server GUID and how to use the NEWID() function to generate GUID values.

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Introduction to SQL Server GUID

Nov 22, 2018  SCOPEIDENTITY is most recommended function to get last identity inserted value in SQL Server. It will return a value on the same scope and same session. Let’s do a simple insert on Student table and to get last identity inserted value. Return generated keys /. Copyright 2003 Sun Microsystems, Inc. ALL RIGHTS RESERVED. Use of this software is authorized pursuant to the terms of the license found at. AUTO INCREMENT Field. Auto-increment allows a unique number to be generated automatically when a new record is inserted into a table. Often this is the primary key field that we would like to be created automatically every time a new record is inserted.

All things in our world are numbered e.g., books have ISBNs, cars have VINs, and people have social security numbers (SSN).

The numbers, or identifiers, help us reference things unambiguously. For example, we can identify John Doe by using his unique social security number 123-45-6789.

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A globally unique identifier or GUID is a broader version of this type of ID numbers.

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A GUID is guaranteed to be unique across tables, databases, and even servers.

In SQL Server, GUID is 16-byte binary data type, which is generated by using the NEWID() function:

If you execute the above statement several times, you will see different value every time. Here is one of them:

In SQL Server, the UNIQUEIDENTIFIER data type holds GUID values.

The following statements declare a variable with type UNIQUEIDENTIFIER and assign it a GUID value generated by the NEWID() function.

Here is the output:

Using SQL Server GUID as primary key

Sometimes, it prefers using GUID values for the primary key column of a table than using integers.

Using GUID as the primary key of a table brings the following advantages:

• GUID values are globally unique across tables, databases, and even servers. Therefore, it allows you to merge data from different servers with ease.
• GUID values do not expose the information so they are safer to use in public interface such as a URL. For example, if you have the URL https://www.example.com/customer/100/ URL, it is not so difficult to find that there will have customers with id 101, 102, and so on. However, with GUID, it is not possible: https://www.example.com/customer/F4AB02B7-9D55-483D-9081-CC4E3851E851/

Besides these advantages, storing GUID in the primary key column of a table has the following disadvantages:

• GUID values (16 bytes) takes more storage than INT (4 bytes) or even BIGINT(8 bytes)
• GUID values make it difficult to troubleshoot and debug, comparing WHERE id = 100 with WHERE id = 'F4AB02B7-9D55-483D-9081-CC4E3851E851'.

SQL Server GUID example

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First, create a new table named customers in the marketing schema:

Second, insert new rows into the marketing.customers table:

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Third, query data from the marketing.customers table:

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Here is the output:

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In this tutorial, you have learned about the SQL Server GUID and how to use the NEWID() function to generate GUID values.