How can I merge rows in TSQL to eliminate null values?

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You can use the COALESCE function to merge rows and eliminate null values in TSQL.

Here is an example:

Suppose you have a table called "Customers" with the following data:

| CustomerID | FirstName | LastName | Email | |------------|-----------|----------|---------------| | 1 | John | Smith | john@example.com | | 2 | Jane | Doe | NULL | | 3 | Bob | Jones | bob@example.com |

To merge rows and eliminate null values in the Email column, you can use the COALESCE function like this:

SELECT CustomerID, FirstName, LastName, COALESCE(Email, '') AS Email
FROM Customers

This will return the following result:

| CustomerID | FirstName | LastName | Email | |------------|-----------|----------|---------------| | 1 | John | Smith | john@example.com | | 2 | Jane | Doe | | | 3 | Bob | Jones | bob@example.com |

The COALESCE function replaces null values with an empty string (''). Therefore, the Email column in the second row is now an empty string instead of null.