How can non-alphanumeric characters be removed from T-SQL?

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Non-alphanumeric characters can be removed from T-SQL using the REPLACE function. This function replaces all occurrences of a specified string or character within another string with a new string. Here's an example:

SELECT REPLACE('Hello World!#@', '#', '')

This will replace the "#" character with an empty string and return the result as "Hello World!". You can use this function repeatedly to replace all non-alphanumeric characters with an empty string:

SELECT REPLACE(REPLACE('Hello World!#@', '#', ''), '@', '')

This will remove both "#" and "@" characters, and return "Hello World!".