MySQL fjerner alle mellemrum fra hele kolonnen

For at erstatte all spaces :

UPDATE `table` SET `col_name` = REPLACE(`col_name`, ' ', '')

For at fjerne alle tabs tegn :

UPDATE `table` SET `col_name` = REPLACE(`col_name`, '\t', '' )

For at fjerne al new line tegn :

UPDATE `table` SET `col_name` = REPLACE(`col_name`, '\n', '')

https://dev.mysql.com/doc /refman/5.0/da/string-functions.html#function_replace

For at fjerne first and last space(s) af kolonne :

UPDATE `table` SET `col_name` = TRIM(`col_name`)

https://dev.mysql.com/doc /refman/5.0/da/string-functions.html#function_trim