diff --git a/lib/query-interface.d.ts b/lib/query-interface.d.ts
index 94786f0..f0da143 100644
--- a/lib/query-interface.d.ts
+++ b/lib/query-interface.d.ts
@@ -1,5 +1,5 @@
 import { DataType } from './data-types'
-import { Logging, Model, ModelAttributeColumnOptions, ModelAttributes, Transactionable } from './model'
+import { Logging, Model, ModelAttributeColumnOptions, ModelAttributes, Transactionable, WhereOptions } from './model'
 import { Promise } from './promise'
 import QueryTypes = require('./query-types')
 import { Sequelize } from './sequelize'
@@ -77,6 +77,7 @@ export interface QueryOptionsWithType {
 export interface QueryInterfaceOptions extends Logging, Transactionable {}
 
 export interface QueryInterfaceCreateTableOptions extends QueryInterfaceOptions {
+    collate?: string
     engine?: string
     charset?: string
     /**
@@ -111,6 +112,41 @@ export interface QueryInterfaceIndexOptions extends QueryInterfaceOptions {
     indexType?: string
 }
 
+export interface AddUniqueConstraintOptions {
+  type: 'unique'
+  name?: string
+}
+
+export interface AddDefaultConstraintOptions {
+  type: 'default'
+  name?: string
+  defaultValue?: any
+}
+
+export interface AddCheckConstraintOptions {
+  type: 'check'
+  name?: string
+  where?: WhereOptions
+}
+
+export interface AddPrimaryKeyConstraintOptions {
+  type: 'primary key'
+  name?: string
+}
+
+export interface AddForeignKeyConstraintOptions {
+  type: 'foreign key'
+  name?: string
+  references?: {
+    table: string
+    field: string
+  }
+  onDelete: string
+  onUpdate: string
+}
+
+export type AddConstraintOptions = AddUniqueConstraintOptions | AddDefaultConstraintOptions | AddCheckConstraintOptions | AddPrimaryKeyConstraintOptions | AddForeignKeyConstraintOptions
+
 /**
  * The interface that Sequelize uses to talk to all databases.
  *
@@ -275,6 +311,16 @@ export class QueryInterface {
      */
     public removeIndex(tableName: string, indexName: string, options?: QueryInterfaceIndexOptions): Promise<void>
     public removeIndex(tableName: string, attributes: string[], options?: QueryInterfaceIndexOptions): Promise<void>
+                                                                                   
+    /**
+     * Adds constraints to a table
+     */
+    public addConstraint(tableName: string, attributes: string[], options?: AddConstraintOptions | QueryInterfaceOptions): Promise<void>
+
+    /**
+     * Removes constraints from a table
+     */
+    public removeConstraint(tableName: string, constraintName: string, options?: QueryInterfaceOptions): Promise<void>
 
     /**
      * Shows the index of a table
diff --git a/test/query-interface.ts b/test/query-interface.ts
index e3b748d..ac05800 100644
--- a/test/query-interface.ts
+++ b/test/query-interface.ts
@@ -39,6 +39,12 @@ queryInterface.createTable(
         engine: 'MYISAM', // default: 'InnoDB'
         charset: 'latin1', // default: null
     }
+  },
+  {
+    engine: 'MYISAM', // default: 'InnoDB'
+    collate: 'latin1_general_ci',
+    charset: 'latin1' // default: null
+  }
 )
 
 queryInterface.dropTable('nameOfTheExistingTable')
@@ -133,3 +139,10 @@ queryInterface.removeIndex('Person', 'SuperDuperIndex')
 // or
 
 queryInterface.removeIndex('Person', ['firstname', 'lastname'])
+
+queryInterface.addConstraint('Person', ['firstname', 'lastname'], {
+  type: 'unique',
+  name: 'firstnamexlastname'
+})
+
+queryInterface.removeConstraint('Person', 'firstnamexlastname')
\ No newline at end of file