Replace a NULL value to Not Set if another column is NULL

Question

I'm making a parameter of salespeople and I need a NULL value in the SalesID column but it needs to say Not Set in the Display name column. There are NULL values in the Display but they have SalesID that I want to use instead.

SELECT SalesID, 
ISNULL(DisplayName, SalesID) AS DisplayName
FROM SalesTable

Answer 1

use case when and COALESCE()

SELECT SalesID, 
case when DisplayName is null and  SalesID is null then 'Not Set' 
 else COALESCE(DisplayName,SalesID) end AS DisplayName
FROM SalesTable

Answer 2

Considering you are using SQL SERVER, You can extend COALESCE function -

SELECT SalesID, 
COALESCE(DisplayName, SalesID, 'Not Set') AS DisplayName
FROM SalesTable

Answer 3

Is this what you want?

SELECT SalesID, 
       COALESCE(DisplayName, 'Not Set') AS DisplayName
FROM SalesTable

Answer 4

SELECT SalesID, 
CASE WHEN (DisplayName IS NULL AND  SalesID IS NULL) THEN 'Not Set' ELSE DisplayName END AS DisplayName
FROM SalesTable