> 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/microsoft-sql-server.md).

# Microsoft SQL Server

Before ingesting your data from Microsoft SQL Server, you must establish a connection to your database.

## Create a SQL Server connection

#### Simple example

A SQL Server connection can be created as follows:

```sql
CREATE MSSQL CONNECTION my_sqlserver_connection
  CONNECTION_STRING = 'jdbc:sqlserver://ms-sqlserver-1.myendpoint;DatabaseName=MyDb'
  USER_NAME = '<user_name>'
  PASSWORD = '<password>';
```

## Alter a SQL Server connection

Some connection options are considered mutable, meaning that in some cases, you can run a SQL command to alter an existing SQL Server connection rather than create a new one.&#x20;

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:

```sql
ALTER MSSQL CONNECTION my_sqlserver_connection
    SET CONNECTION_STRING = 
       'jdbc:sqlserver://ms-sqlserver-1.myendpoint;DatabaseName=customers'
```

## Drop a SQL Server connection

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

```sql
DROP CONNECTION my_sqlserver_connection;
```

However, note that if existing tables or jobs depend upon the connection, the connection cannot be dropped.

***

{% 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 [Microsoft SQL Server](/content/reference-1/sql-commands/connections/create-connection/microsoft-sql-server.md).
{% endhint %}


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