To store rich text in a SQL database, you can use the nvarchar(max) data type, which can store up to 2GB of Unicode text. Here's an example of how you can create a table to store rich text: 

Note that this example assumes that you have a SqlConnection object named connection, a SqlCommand object named command, and a RichTextBox control named myRichTextBox. You will need to replace "your connection string here" with your actual connection string.

Also note that if you're using a different database system (such as MySQL or PostgreSQL), the specific syntax for creating tables and inserting data may be different.