How many types of function in SQL Server ?

There are three types of UDF

Scalar function
In-line function
Multi-statement functions.

Sclare Function

Scalar UDFs return a single value. They are similar to built-in functions such as DB_NAME(), GETDATE(), or USER_ID(), which return a single string, date, or integer

Inline Function

In-line UDFs return a single row or multiple rows and can contain a single SELECT statement. Because in-line UDFs are limited to a single SELECT, they can't contain much logic

Multi-Statement Function

Multi-statement UDFs can contain any number of statements that populate the table variable to be returned. Notice that although you can use INSERT, UPDATE, and DELETE statements against the table variable being returned, a function cannot modify data in permanent tables

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