prueba tecnica

db/06_CheckRateExists.sql

@@ -0,0 +1,15 @@
+DROP FUNCTION IF EXISTS public.check_rate_exists(INTEGER);
+
+CREATE OR REPLACE FUNCTION public.check_rate_exists(p_id INTEGER)
+RETURNS INTEGER
+AS $$
+    SELECT CASE
+             WHEN EXISTS (
+                    SELECT 1
+                      FROM public.rates
+                     WHERE id = p_id
+                 )
+             THEN 1
+             ELSE 0
+           END;
+$$ LANGUAGE SQL STABLE;