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The ISNULL function will replace null values with the value noted in the second parameter, which in this example is an empty string.
As you can see in the example below, the Mailing Name is no longer NULL as it replaced the NULL values with an empty string.
Below is an example is using ISNULL along with the plus sign for concatenation.
This means you have to know the column combinations that appear in the clause.
Defining an optimal index is therefore very difficult for external consultants because they don't have an overview of the application's access paths. They do not exploit the extra benefit the index could bring for other queries.
Developers have a feeling for the data and know the access path.
They can properly index to get the best benefit for the overall application without much effort. He is on a mission to introduce developers to the evolution of SQL in the 21st century.