> For the complete documentation index, see [llms.txt](https://upsolver.gitbook.io/content/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://upsolver.gitbook.io/content/how-to-guides-1/connectors/create-connections/postgresql.md).

# PostgreSQL

Before you can write your transformed data to a table in PostgreSQL, you should first establish a connection to your PostgreSQL database.

## Create a PostgreSQL connection

#### Simple example

A PostgreSQL connection can be created as follows:

```sql
CREATE POSTGRES CONNECTION postgress_connection
   CONNECTION_STRING = 
    'jdbc:postgresql://cdc2.c02eyuedjkh9.eu-west-1.rds.amazonaws.com:5432/auction'
   USER_NAME = 'your username'
   PASSWORD = 'your password';
```

When using PostgreSQL, it is not necessary to specify the database itself in the connection string.

## Alter a PostgreSQL connection

Some connection options are considered mutable, meaning that in some cases, you can run a SQL command to alter an existing PostgreSQL connection rather than create a new one.

To change the database you are connecting to but keep everything else the same without having to create an entirely new connection, you can run the following command:

{% code overflow="wrap" %}

```sql
ALTER POSTGRES CONNECTION my_postgres_connection
    SET CONNECTION_STRING = 'jdbc:postgresql://postgresql-cluster-1.cnpkgni9k2tq.us-east-1.rds.amazonaws.com/database'
```

{% endcode %}

## Drop a PostgreSQL connection

If you no longer need a certain connection, you can easily drop it with the following SQL command:

```sql
DROP CONNECTION my_postgres_connection; 
```

However, note that if there are existing tables or jobs that are dependent upon the connection in question, the connection cannot be deleted.

***

{% hint style="success" %}
**Learn More**

To discover which connection options are mutable, and to learn more about the options, please see the SQL command reference for [PostgreSQL](/content/reference-1/sql-commands/connections/create-connection/postgresql.md).
{% endhint %}


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