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  • i tried it but its not working, may be there are some extra characters in between Commented Jan 20, 2015 at 12:04
  • LTRIM(RTRIM(column_A)) = '', isn't that exactly the same as column_A = '' ? Commented Jan 20, 2015 at 12:16
  • @t-clausen.dk: you're right :) Edited my answer to take it into account. Commented Jan 20, 2015 at 12:23