Sql Generate Primary Key Value

Summary: in this tutorial, you will learn how to use the SQL Server PRIMARY KEY constraint to create a primary key for a table. Introduction to SQL Server PRIMARY KEY constraint. A primary key is a column or a group of columns that uniquely identifies each row in a table. You create a primary key for a table by using the PRIMARY KEY constraint. If the primary key consists of only one column, you can define use PRIMARY KEY constraint as a column constraint.
Introduction to SQL Server PRIMARY KEY constraint A primary key is a column or a group of columns that uniquely identifies each row in a table. You create a primary key for a table by using the PRIMARY KEY constraint. If the primary key consists of only one column, you can define use PRIMARY KEY constraint as a column constraint.

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

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.

Introduction to SQL Server GUID

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.

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

Pengertian Primary Key

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

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

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

Third, query data from the marketing.customers table:

Here is the output:

Sql Generate Primary Key Value 2017

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