SQL: Create Rerunnable Script to Insert Default Data Into a Table

Sometimes you need to initialize a database with default data such as lookup data. The following script will insert the data and is rerunnable so it can be run again without insert previously inserted data.

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--CONTENT TYPES
INSERT INTO	ContentTypes (Name, ContentTypeId)

SELECT		*
			
FROM		(
			SELECT	'Post' Name, 1 ContentTypeId UNION ALL
			SELECT	'Forum' Name, 2 ContentTypeId UNION ALL
			SELECT	'Thread' Name, 3 ContentTypeId UNION ALL
			SELECT	'Blog' Name, 4 ContentTypeId
			) AS DefaultData
			
WHERE		NOT EXISTS (SELECT TOP 1 * FROM ContentTypes ExistingData WHERE ExistingData.ContentTypeId = DefaultData.ContentTypeId)