Christoph Zwerschke <c...@online.de> wrote: > Am 26.04.2010 12:11, schrieb Takahiro Itagaki: >> Do you know how the SQL standard mention the behavior? IMHO, >> postgres' behavior is more reasonable because >> length(' '::char(1)) is 0. > > Just found http://troels.arvin.dk/db/rdbms/ which claims that this > is against the standard: > > "PostgreSQL: Stores CHARs in space padded form, but violates > the standard by (conceptually) truncating trailing white-space > before performing most functions, operators, and comparisons > (like the CHARACTER_LENGTH-function and the concatenation(||) > operator)." > > Not sure if this is correct and how well-defined the SQL standard > actually is in this regard. It seems Oracle does not remove > trailing spaces when converting from char to varchar. That is consistent with how I remember the standard (although I don't have time right now to fight my way through it to confirm). My recollection is that char(n) should be treated exactly like a varchar padded with spaces to n characters *except* for character string comparisons, where trailing spaces are supposed to be ignored. -Kevin
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