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sqlite [sqlite] Collating Sequences

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작성자 rootman
댓글 0건 조회 4,943회 작성일 11-10-28 11:40

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When SQLite compares two strings, it uses a collating sequence or collating function (two words for the same thing) to determine which string is greater or if the two strings are equal. SQLite has three built-in collating functions: BINARY, NOCASE, and RTRIM.

BINARY - Compares string data using memcmp(), regardless of text encoding.
NOCASE - The same as binary, except the 26 upper case characters of ASCII are folded to their lower case equivalents before the comparison is performed. Note that only ASCII characters are case folded. SQLite does not attempt to do full UTF case folding due to the size of the tables required.
RTRIM - The same as binary, except that trailing space characters are ignored.

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