Initial data commit

Task/Fibonacci-sequence/PL-pgSQL/fibonacci-sequence-4.sql

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+CREATE OR REPLACE FUNCTION fibTailRecursive(n INTEGER, prevFib INTEGER DEFAULT 0, fib INTEGER DEFAULT 1)
+RETURNS INTEGER AS $$
+BEGIN
+  IF (n = 0) THEN
+    RETURN prevFib;
+  END IF;
+  RETURN fibTailRecursive(n - 1, fib, prevFib + fib);
+END;
+$$ LANGUAGE plpgsql;