diff --git a/src/app/db/schema/relations.ts b/src/app/db/schema/relations.ts
new file mode 100644
index 00000000..6640da27
--- /dev/null
+++ b/src/app/db/schema/relations.ts
@@ -0,0 +1,102 @@
+// This script contains ALL relations for the database, used by drizzle-orm
+
+import { relations } from "drizzle-orm";
+import { property, propertyTargets } from "./property";
+import {
+  plan,
+  planRecommendations,
+  recommendation,
+  recommendationMaterials,
+} from "./recommendations";
+import { material } from "./materials";
+import { portfolio, portfolioUsers } from "./portfolio";
+import { user } from "./users";
+
+// Define the other side of the one to many relation between a property and its recomendations
+export const recommendationsRelations = relations(
+  recommendation,
+  ({ one, many }) => ({
+    property: one(property, {
+      fields: [recommendation.propertyId],
+      references: [property.id],
+    }),
+    recommendationMaterials: many(recommendationMaterials),
+  })
+);
+
+// We construct a relationship between a recommendation and recommendationMaterials
+// On recommendationMaterial will map to a single recommendation
+
+// Define the relationships for the material table
+export const materialRelations = relations(material, ({ many }) => ({
+  recommendationMaterials: many(recommendationMaterials),
+}));
+
+// Define the relationships for the recommendationMaterials table
+export const recommendationMaterialsRelations = relations(
+  recommendationMaterials,
+  ({ one }) => ({
+    recommendation: one(recommendation, {
+      fields: [recommendationMaterials.recommendationId],
+      references: [recommendation.id],
+    }),
+    material: one(material, {
+      fields: [recommendationMaterials.materialId],
+      references: [material.id],
+    }),
+  })
+);
+
+// create a one to many relation to map a plan to the details in the underlying recommendation
+// create a many to many map from a plan to a recommendation
+// A recommendation can be in multiple plans and therefore we have a many to many relationship between
+// plan and recommendations. This relationship is facilitated by the planRecommdnations table
+
+export const planRelations = relations(plan, ({ many }) => ({
+  planRecommendations: many(planRecommendations),
+}));
+
+export const planRecommendationsRelations = relations(
+  planRecommendations,
+  ({ one }) => ({
+    plan: one(plan, {
+      fields: [planRecommendations.planId],
+      references: [plan.id],
+    }),
+    recommendation: one(recommendation, {
+      fields: [planRecommendations.recommendationId],
+      references: [recommendation.id],
+    }),
+  })
+);
+
+// one to one relationship between property and propertyTargets, and also to the recommendations table
+export const propertyRelations = relations(property, ({ one, many }) => ({
+  target: one(propertyTargets, {
+    fields: [property.id],
+    references: [propertyTargets.propertyId],
+  }),
+  recommendations: many(recommendation),
+}));
+
+// We have a many to many relationship between users and portfolios
+// One user can have many portfolios, and one portfolio can have many users
+// We use the Dizzle relational queries pattern to facilitate this
+
+// Define relation from users to portfolios
+export const usersToPortfolioRelations = relations(user, ({ many }) => ({
+  portfolios: many(portfolio),
+}));
+
+// Define relation from portfolios to users
+export const portfolioToUsersRelations = relations(portfolio, ({ many }) => ({
+  users: many(user),
+}));
+
+// Define relation from portfolioUsers to portfolios (we can have many users to a portfolio)
+export const portfolioUsersToPortfolioRelations = relations(
+  portfolioUsers,
+  ({ many }) => ({
+    portfolio: many(portfolio),
+  })
+);