All spaces
UPDATE 'tableName' SET 'columnName' = REPLACE('columnName', ' ', '')
All tabs
UPDATE 'tableName' SET 'columnName' = REPLACE('columnName', '\t', '')
New lines
UPDATE 'tableName' SET 'columnName' = REPLACE('columnName', '\n', '')
First and last spaces
UPDATE 'tableName' SET 'columnName' = TRIM('columnName')