Hi everybody,

I'm using VFP8 SP1. I have the following tables: Styles with IDX Styles with index on Style field, Orders with PON field and IDX on it and Or_Items with Style and PON field with indexes on Style and PON + Style (IDX).

My task is to find styles with 0 or negative in stock, where in_stock is a field in Styles table, but we may have special kind of Orders where PON = "HOUSE", which means these styles are going to be brought in.

Here is my current code with various attempts to speed the process, but all unsuccessful so far:

[One select statement takes ~230 sec., 4 select statements with index creation take 145 sec., which is still too slow].

lSelectWay = AskNo("Do you want to use SQL-Select solution?") &&.T. && Set to true if you prefer select solution

IF m.lSelectWay
	ltStartTime = DATETIME()
	LOCAL lcWhere, lcOldANSI
	lcOldANSI = SET("Ansi")
	SET ANSI OFF

	lcWhere = [Styles.Style NOT IN ("F","S","X","D","M", "CD", "PK") ] + ;
		[and NOT Styles.Style LIKE "%.%"] && [Styles.In_Stock <=1 ]

	DO CASE
	CASE m.cact = "A" && Active
		lcWhere = m.lcWhere + [ and Styles.DisContinu = "A"]

	CASE m.cact = "I" && Inactive
		lcWhere = m.lcWhere + [ and Styles.DisContinu = "I"]

	CASE m.cact = "B" && Both 
		lcWhere = m.lcWhere + [ and Styles.DisContinu IN ("A","I")]
	ENDCASE

	USE styles INDEX styles IN 0 && Style
	USE or_items INDEX or_style, or_items IN 0 && Style, PON + Style
	USE orders INDEX orders IN 0 && PON

	LOCAL loThermo, lcClass
	lcClass = "cusSQLThermo"
	loThermo = CREATEOBJECT(m.lcClass) && we need visual indication for long select
	
	SELECT styles.STYLE as Style, styles.RESERVED AS nReserved, styles.in_stock AS nInStock ;
	FROM Styles WHERE &lcWhere AND Reserved >= In_Stock INTO CURSOR curStyles readwrite
*	INDEX ON Style TAG cStyle
*!*		
*!*		SELECT PON, Style as cStyle, qty, shiped, can_qty FROM Or_Items ;
*!*		WHERE Style in (select cStyle FROM curStyles) INTO CURSOR curOr_Items readwrite
*!*		INDEX ON PON TAG PON
*!*		INDEX ON cStyle TAG cStyle
*!*		
*!*		SELECT PON, Acc, Approved, App_Date FROM Orders ;
*!*		WHERE PON in (select PON FROM curOr_Items) ;
*!*		INTO CURSOR curOrders readwrite
*!*		INDEX ON PON TAG PON
*!*		
*!*		SELECT curStyles.cStyle, curStyles.nReserved, curStyles.nInStock, ;
*!*		SUM(IIF(curOrders.acc = "HOUSE" AND (NOT curOrders.Approved == "" OR NOT curOrders.app_date = {}), ;
*!*			curOr_items.qty - curor_items.shiped - curor_items.can_qty, 000000000)) AS nHouseOrder ;
*!*		FROM curStyles INNER JOIN curOr_Items ON curStyles.cStyle = curOr_Items.cStyle ;
*!*		INNER JOIN curOrders ON curOr_Items.PON = curOrders.PON ;
*!*		GROUP BY 1,2,3 HAVING (nHouseOrder + nInStock) - nReserved <=0 ;
*!*			INTO CURSOR dummy READWRITE
*!*		** Close unused cursors
*!*		USE IN curOr_Items
*!*		USE IN curStyles
*!*		USE IN curOrders		
*!*		
	SELECT or_Items.Style, sum(or_items.qty-or_items.shiped-or_items.can_qty) as nHouseOrder ;
	FROM Or_Items WHERE Or_Items.Style IN (select Style FROM curStyles) ;
	AND Or_Items.PON + Or_Items.Style IN ;
	(select PON FROM Orders WHERE orders.acc = "HOUSE" AND (NOT approved == "" OR NOT app_date = {})) ;
	GROUP BY 1 INTO CURSOR curOr_Items
	
	SELECT curStyles.Style FROM curStyles LEFT JOIN curOr_Items ON ;
	curStyles.Style = curOr_Items.Style ;
	WHERE (nReserved - nStock) >= NVL(nHouseOrder,0) INTO CURSOR Dummy ;
	ORDER BY 1
	
*!*		SELECT or_items.Style, SUM(IIF(orders.acc = "HOUSE" AND (NOT approved == "" OR NOT app_date = {}), ;
*!*			or_items.qty-or_items.shiped-or_items.can_qty, 000000000)) AS nHouseOrder ;
*!*			FROM orders INNER JOIN Or_Items ON Orders.PON = Or_Items.PON ;
*!*			WHERE Style in (select Style FROM curStyles) ;
*!*			GROUP BY 1 INTO CURSOR curTemp READWRITE
*!*			
*!*		INDEX ON Style TAG cStyle
*!*		
*!*		SELECT curStyles.Style FROM curStyles ;
*!*		INNER JOIN curTemp ON curStyles.Style = curTemp.Style ;
*!*		WHERE (nHouseOrder + nInStock) - nReserved <=0 INTO CURSOR Dummy
	RELEASE loThermo
	USE IN curStyles
	USE IN curOr_Items
	SELECT dummy