SQL case conversion, remove the space before and after

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-- toggle case Change to lowercase

UPDATE file_selection SET mash=LOWER(mash) WHERE xxxxx = '0';

-- toggle case Capitalize

UPDATE file_selection SET mash=UPPER(mash) WHERE xxxxx = '0';

-- Remove the space in the field The space before the character

UPDATE file_selection SET mash=ltrim(mash)

-- Remove the space in the field Space after character

UPDATE file_selection SET mash=rtrim(mash)

-- Remove the space in the field Spaces in characters

UPDATE file_selection SET mash=replace(mash, ' ', '')  WHERE xxxxx = '0';