Mysql:Trim all fields in database

Question

UPDATE mytable SET mycolumn= LTRIM(RTRIM(mycolumn));

works fine on trimming columns removing trailer spaces, but how can i adjust it to trim all column

Answer 1

you expand the query for each column:

UPDATE mytable
SET mycolumn = LTRIM(RTRIM(mycolumn)),
    mycolumn2 = LTRIM(RTRIM(mycolumn2)),
    ...;