diff --git a/src/dbStructure.ts b/src/dbStructure.ts
index 1ca68d8..26de25e 100644
--- a/src/dbStructure.ts
+++ b/src/dbStructure.ts
@@ -102,7 +102,6 @@ export class joinCross implements Joins{
 
 export interface Constraint {
     name: string;
-    serialize(handler: Handler): QueryBuilder;
     uses(attr: Attribute): boolean;
     check(table: Table): boolean | string;
 }
@@ -120,9 +119,6 @@ export class checkConstraint implements Constraint {
     uses(attr: Attribute): boolean {
         throw new Error("Method not implemented.");
     }
-    serialize(handler: Handler): QueryBuilder {
-        throw new Error("Method not implemented.");
-    }
 }
 
 export class uniqueConstraint implements Constraint {
@@ -142,10 +138,6 @@ export class uniqueConstraint implements Constraint {
     uses(attr: Attribute): boolean {
         return this.attrs.includes(attr);
     }
-    serialize(handler: Handler): QueryBuilder {
-        throw new Error("Method not implemented.");
-    }
-
 }
 
 export class foreignConstraint implements Constraint {
@@ -161,9 +153,6 @@ export class foreignConstraint implements Constraint {
         this.onUpdate = onUpdate;
         this.onDelete = onDelete;
     }
-    serialize(handler: Handler): QueryBuilder {
-        throw new Error("Method not implemented.");
-    }
     uses(attr: Attribute): boolean {
         throw new Error("Method not implemented.");
     }