# Resolvers

Resolvers tell Kontrl **where your data lives**. If you want data from PostgreSQL then you can use the **PostgreSQL resolver**. If you need data from MySQL you'll be using the **MySQL resolver** and so forth.

Your data does **not** all to come from the same place. But you need a resolver for every place your data is coming from. More about this in the "table" section.

## Popular resolvers

No need to write your own resolver when one already exists.

- [postgres](#postgres-resolver)

## Postgres resolver

The postgres resolver works with the [node-postgres](https://node-postgres.com/) library.
The resolver takes **2 parameters**.

1. The postgres **Client** or **Pool**. 
2. The table **name**

```js
const kontrl = require("kontrl");

const resolver = kontrl.resolver.postgres(pgclient, "users");
```