The length of the substring to extract from string_expression.
If n2 < 0, the function returns an error
If string_expression is a BYTE or CHAR type and you omit n2 , trailing binary zeros or pad characters are trimmed
The length of the substring to extract from string_expression.
If n2 < 0, the function returns an error
If string_expression is a BYTE or CHAR type and you omit n2 , trailing binary zeros or pad characters are trimmed