Se agregó una tarea en carpeta dia3

dia3/Entidad_Relacion.sql

+CREATE TABLE "Lot" (
+  "LotNumber" SERIAL PRIMARY KEY,
+  "CreateDate" date,
+  "Cost_Of_Materials" float
+);
+
+CREATE TABLE "Lot_Raw_Materials" (
+  "id" SERIAL PRIMARY KEY
+);
+
+CREATE TABLE "Raw_Materials" (
+  "material_id" SERIAL PRIMARY KEY,
+  "UniCost" float,
+  "type" varchar
+);
+
+CREATE TABLE "Production_Units" (
+  "serial" SERIAL PRIMARY KEY,
+  "exactWeight" float,
+  "ProductType" varchar,
+  "ProductDesc" float
+);
+
+ALTER TABLE "Lot" ADD FOREIGN KEY ("LotNumber") REFERENCES "Lot_Raw_Materials" ("id");
+
+ALTER TABLE "Raw_Materials" ADD FOREIGN KEY ("material_id") REFERENCES "Lot_Raw_Materials" ("id");
+
+ALTER TABLE "Production_Units" ADD FOREIGN KEY ("serial") REFERENCES "Lot" ("LotNumber");