Question

I want to update my table so that every column that has a value of NULL is updated to be and empty string.

Currently I have the following query, but it would only update one column and I want to update all columns that are NULL to empty string.

UPDATE table SET column1='' WHERE column1 IS NULL

Answer 1

You can update multiple columns with one statement by doing something like this:

UPDATE table SET column1='', column2='', column3='' WHERE column1 IS NULL

HOWEVER thsi will only update based on the where clause.

For what you are trying to do, you’ll need separate statements.

UPDATE table SET column1='' WHERE column1 IS NULL
UPDATE table SET column2='' WHERE column2 IS NULL
UPDATE table SET column3='' WHERE column3 IS NULL

EDIT Try this:

UPDATE table SET column1= IfNull(column1,''), column2= IfNull(column2,'') , column3= IfNull(column3,'')