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

If there are not too many columns, you could just
directly UPDATE each by your_column_name, via the TRIM() function:

UPDATE mytable SET 
mycolumn1 = TRIM(mycolumn1), 
mycolumn2 = TRIM(mycolumn2),
mycolumn3 = TRIM(mycolumn3),
mycolumn4 = TRIM(mycolumn4)

Otherwise, ZweiStein's answer above for a single table,
or Izhar Aazmi's answer for an entire database seem the way to go.

Hiram's answer to another SO Post includes a check to only TRIM VARCHAR fields: excellent feature!

Or, if using T-SQL, or others which do not support TRIM, use the LTRIM(RTRIM(...)) trick,
suggested by Jim Rubenstein and Denis de Bernardy above.