---
title: "Multiple Forms: Unions are not supported"
date: 2026-04-23
author: "GravityKit"
link: "https://www.gravitykit.com/docs/gravityview-pro/multiple-forms/multiple-forms-unions-are-not-supported/"
---

The current version of the Multiple Forms extension can only perform a [JOIN](https://www.w3schools.com/sql/sql_join.asp) operation, not a [UNION](https://www.w3schools.com/sql/sql_union.asp) operation (yet).

## How a `UNION` works (not yet possible with GravityView)

It can't combine the information of two forms like this...

![Form A with duplicate entries for names and emails](https://www.gravitykit.com/wp-content/uploads/2025/10/file-lmruokmDZX.png)
*!*[Form B table showing contact details with headers: First, Last, Email. Entries underlined in first row](https://www.gravitykit.com/wp-content/uploads/2025/10/file-bvmaB7v8wa.png)...into a View like this:

![Two tables with names and emails, illustrating the issue of unsupported unions in data forms](https://www.gravitykit.com/wp-content/uploads/2025/10/file-22aReCos03.png)

### **That's not possible!** 

## How a `JOIN` works

What the plugin allows instead is the following, known as a "JOIN":

![Form A with duplicate entries for names and emails](https://www.gravitykit.com/wp-content/uploads/2025/10/file-lmruokmDZX.png)
*!*[Table with duplicate names, different email addresses in "Form B". Email: alice@alice.com, bob@alice.com](https://www.gravitykit.com/wp-content/uploads/2025/10/file-dV4i17Zd9v.png)Joining these two forms by the email address and outputting a View like this:

![Data source selection with options to join Form A and Form B by email](https://www.gravitykit.com/wp-content/uploads/2025/10/file-AJ75Z3i4an.png)
*![Table shows joined view A with B, listing names and emails under columns First, Last, and Email](https://www.gravitykit.com/wp-content/uploads/2025/10/file-SZkqEKaVov.png)*