GUID in SQL Server
Problem Please provide T-SQL examples that illustrate how to create and use GUID values in SQL Server . Also, show how to analyze GUID values with T-SQL. Include a couple of examples on how to detect duplicate values in a column of GUIDs . Additionally, discuss how duplicate values can exist in columns of globally unique values.
To generate a GUID in SQL Server , use the NEWID () function. It produces a globally unique alphanumeric value of 128 bits, ideal for primary keys or unique identifiers in databases.
uniqueidentifier (Transact
uniqueidentifier (Transact- SQL ) Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fabric SQL database in Microsoft Fabric Is a 16-byte GUID .
As discussed above GUID datatype is represented by uniqueidentifier. A primary key is a unique identifier for every entry in a table that prevents duplicate values from occurring. So, Instead of using integers as the primary key, you can use GUIDs as the PRIMARY KEY Column of a table which brings in some advantages. SQL Server GUID Example
An Essential Guide To SQL Server GUID By Examples
Learn what a GUID is and how to use the NEWID() function to generate it in SQL Server . See the advantages and disadvantages of using GUID as a primary key and a practical example.
Learn what a GUID is, how to create and use it in SQL Server , and how it can solve the problem of redundant primary keys across tables and databases. See examples, scripts, and output of the GUID data type in action.
What data type is GUID in SQL server
Performance wise, normal GUID is slower than INT in SQL Server If you plan to use GUID , use uniqueidentifier instead of varchar as data type. Microsoft did not mention how they implement it, there is some speed optimization when you use uniqueidentifier as the data type.
In SQL Server , in addition to the uniqueidentifier, we can also use binary, Unicode, and non-Unicode datatypes (variable or fixed length) to store GUID values - more on that in the following section. Let's store a big, positive numeric value into a UNIQUEIDENTIFIER and in a BINARY data type of the same size (16bytes), and see what happens.
NEWID (Transact
B. Using NEWID in a CREATE TABLE statement Applies to: SQL Server The following example creates the 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 CustomerID column.
Learn about SQL Server uniqueidentifier and identity values to generate a unique value for for you SQL Server tables.