How to Check if a GUID is NULL?
It is a very important factor to check whether a GUID is null or not because it is important for us to create a GUID if it is a null if we do not create a GUID in case it is null then it can throw errors as we have understood the GUID can be used to link multiple databases or servers together using a common column etc. so now let us understand how to check if a GUID is null or not.
It is very simple and straightforward to check whether a GUID is null or not. For this, we can simply use the IS NULL keyword. Let’s understand how:
This is the SQL Server code that we will use for checking if the GUID is NULL or not:
Declare @guidtest Uniqueidentifier
If(@guidtest IS NULL)
Begin
Print 'The GUID is NULL.'
End
Else
Begin
Print 'The GUID is not NULL.'
End
Output:
Explanation of the Code
As we can see that we have declared a GUID using a @ that we have added, this @ symbol allows us to have a user-defined variable that continues beyond the query which defines the variables. Secondly, we are running an if statement that checks if the GUID (@guidtest in this case), is null or not by using the built-in operator IS NULL of MS SQL Server. lastly, we have two statements after the if statement, The first one is used to print the content of the print statement if the values are NULL, and the second print statement returns if the values are not NULL.
How to Check GUID is Null or Empty in SQL Server
GUID stands for Globally Unique Identifier, the GUID is a 16-byte long binary data type. the GUID is special because it is globally unique across all the databases, tables, and servers available. In the GUID there is a unique reference number present which is generated by the algorithm every time we execute the query to generate GUID. the GUID is stored as a 128-bit value but when it is displayed by the machine or system it is displayed as 32 hexadecimal digits. in this article we will learn what is GUID, why they are used as well as how to create them, and whether a GUID is null or empty in the SQL Server.
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