postgresql - SQL Complex number constraint -


hello using postegresql , want constrain number(tax id number) obey following rules:

  • 9 digits
  • the last digit (z) calculated according to:

x = 8th * 2 + 7th * 3 + 6th * 4 + 5th * 5 + 4th * 6 + 3rd * 7 + 2nd * 8 + 1st + 9

y = x % 11   if (y == 0 || x == 1) z = 0; else z = 11 - y

is possible in sql?

yes, possible although cumbersome. looks this:

check ((col regexp_matches '^[0-9]{9}$) ,        (case when (substring(col, 1, 1) * 9 + substring(col, 2, 1) * 8 + substring(col, 3, 1) * 7 +                    substring(col, 4, 1) * 6 + substring(col, 5, 1) * 5 + substring(col, 6, 1) * 4 +                    substring(col, 7, 1) * 3 + substring(col, 8, 1) * 2                    ) % 11 = 0 or                   (substring(col, 1, 1) * 9 + substring(col, 2, 1) * 8 + substring(col, 3, 1) * 7 +                    substring(col, 4, 1) * 6 + substring(col, 5, 1) * 5 + substring(col, 6, 1) * 4 +                    substring(col, 7, 1) * 3 + substring(col, 8, 1) * 2                    ) = 1              0              else 11 -                   ((substring(col, 1, 1) * 9 + substring(col, 2, 1) * 8 + substring(col, 3, 1) * 7 +                     substring(col, 4, 1) * 6 + substring(col, 5, 1) * 5 + substring(col, 6, 1) * 4 +                     substring(col, 7, 1) * 3 + substring(col, 8, 1) * 2                     ) % 11                   )         end) = substring(col, 9, 1) + 0     )

personally, encapsulate in function , use function instead.


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