da qui https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_substring
For all forms of SUBSTRING(), the position of the first character in the string from which the substring is to be extracted is reckoned as 1.
da qui https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_substring
For all forms of SUBSTRING(), the position of the first character in the string from which the substring is to be extracted is reckoned as 1.
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