MySql Query Replace NULL with Empty String in Select

Question

How do you replace a NULL value in the select with an empty string? It doesnt look very professional to output \"NULL\" values.

This is very unusual and based on my synt

Answer 1

select IFNULL(`prereq`,'') as ColumnName FROM test

this query is selecting "prereq" values and if any one of the values are null it show an empty string as you like So, it shows all values but the NULL ones are showns in blank