-- ================================================
-- Template generated from Template Explorer using:
-- Create Inline Function (New Menu).SQL
--
-- Use the Specify Values for Template Parameters 
-- command (Ctrl-Shift-M) to fill in the parameter 
-- values below.
--
-- This block of comments will not be included in
-- the definition of the function.
-- ================================================
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:		<Author,,Name>
-- Create date: <Create Date,,>
-- Description:	<Description,,>
-- =============================================
CREATE FUNCTION NumberOfPI 
(	
	-- Add the parameters for the function here
	@att1 varchar(50),
	@att2 varchar(50)
)
RETURNS INT 
AS
BEGIN
	DECLARE @numPI INT;

	SELECT 
	@numPI =
	count(distinct a1.value)
	FROM events as e1, events as e2, correlationAttributes as a1, correlationAttributes as a2
	WHERE a1.attribute = @att1 and a2.attribute = @att2 and a1.value=a2.value 
	AND a1.value<>'' AND a1.value IS NOT NULL
	AND a2.value<>'' AND a2.value IS NOT NULL
	and a1.idEvent<>a2.idEvent and a1.idEvent=e1.id and a2.idEvent=e2.id
	AND e1.timestamp<e2.timestamp;
	
	RETURN @numPI;


END;
GO