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In SQL Server, user-defined functions (UDFs) allow you to encapsulate reusable logic that can return either a scalar value or a table. Below are the steps and examples for creating scalar and table-valued functions.
Scalar-Valued Function
A scalar function returns a single value of a specified data type.
Steps:
Use the CREATE FUNCTION statement.
Define input parameters and their data types.
Specify the return data type using RETURNS.
Write the function logic inside the BEGIN and END block.
Use the RETURN statement to specify the output.
Example:
CREATE FUNCTION dbo.CalculateSquare (@Number INT)RETURNS INTASBEGINRETURN @Number * @Number;END;GO-- Usage:SELECT dbo.CalculateSquare(5) AS SquareResult;Copied!✕CopyThis function calculates the square of a given number.
Inline Table-Valued Function
An inline table-valued function returns a table based on a single SELECT statement.
Steps:
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