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The LOWER(character_expression) and UPPER(character_expression) functions convert all the characters of the argument accordingly to the lower and upper register. These functions turn out to be useful in comparison with the registerdepended strings.

A pair of the interesting functions SOUNDEX and DIFFERENCE

  1. SOUNDEX(character_expression )
  2. DIFFERENCE (character_expression _1, character_expression_2)
allow us to determine the similar-sounding of words. SOUNDEX returns a four-character code to evaluate the similarity, but DIFFERENCE just properly evaluates the similarity of two comparing character strings. Being that these functions do not support Cyrillic, I refer interested to BOL for the examples of its usage.

In conclusion we will adduce some functions and a few examples of the Unicode usage.

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