Data update

Task/Anonymous-recursion/DuckDB/anonymous-recursion.duckdb

@@ -0,0 +1,11 @@
+create or replace function fib(n) as (
+  if ( n < 0, error('negative arguments not allowed'),
+  (with recursive fib(i,e,f) as (
+     select 1, 1, 1
+     union all
+     select i+1, e+f, e from fib
+     where i <= n)
+   select last(f order by i)
+   from fib)
+  )
+);