Question

I have a single Column table with ID column as Identity. I need to have a Function that can Insert and Return Newly inserted Identity on Function call. I have created a function but we cant use INSERT in SCALAR functions. What else could be a solution

Answer 1

You can use default function of sql server Scope_Identity() to get the newly inserted identity field. Please refer the link
SCOPE_IDENTITY (Transact-SQL)
for more details.

DECLARE @Identity INT
INSERT INTO TableName (Column1, Column2, )VALUES(@value1, @value2, ...)
SET @Identity=Scope_Identity()

You can make the same as stored procedure. Ex

CREATE PROCEDURE USP_ProcedureName
(
    @Input1 INT,
    @Identity INT OUTPUT
)
AS
BEGIN
    INSERT INTO TableName (Col1) VALUES (@Input1)
    SET @Identity=Scope_Identity()
END
GO

Out put parameter can be retrieved by executing the stored procedure using EXEC command. Like

DECLARE @OutVar INT
EXEC USP_ProcedureName 1, @OutVar OUTPUT
SELECT @OutVar