(mysql.info) string-collating

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 5.11.5 String Collating Support
 -------------------------------
 
 If the sorting rules for your language are too complex to be handled
 with the simple `sort_order[]' table, you need to use the string
 collating functions.
 
 The best documentation for this is the existing character sets.  Look
 at the `big5', `czech', `gbk', `sjis', and `tis160' character sets for
 examples.
 
 You must specify the `strxfrm_multiply_MYSET=N' value in the special
 comment at the top of the file.  N should be set to the maximum ratio
 the strings may grow during `my_strxfrm_MYSET' (it must be a positive
 integer).
 

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