By contrast, COALESCE with non-null parameters is considered to be NULL. You must specify at least two expressions. Using the SQL Coalesce function in SQL Server Let us handle the NULL values using a function called SQL COALESCE.
SQL Coalesce function - how to use it with SQL Coalesce function - how to use it with examples. Unterschiede zwischen ISNULL und COALESCE Es gibt keine Unterschiede zwischen ISNULL und COALESCE. The function returns the value of the first of its input parameters that is not NULL. Daher weisen der ISNULL (NULL, 1)-Ausdruck und der COALESCE (NULL, 1)-Ausdruck unterschiedliche Werte f r die NULL -Zul ssigkeit auf, obwohl sie gleich sind.
If all occurrences of expr evaluate to null, then the function returns null. The number of parameters you pass to COALESCE is up to you. The SQL Coalesce function receives a list of parameters that are seperated by commas.
Unterschiede zwischen ISNULL und COALESCE
So, in this case, use the coalesce SQL function to replace any middle name NULL values with a value (Char(13)-space).