проблемы в получении счета

Question

Вот моя таблица полной схемы, я хочу, чтобы получить количество каждой категории Продажи,

Как получить, что каждая категорию количество продажи,

CREATE TABLE IF NOT EXISTS `tblbasket` (
    `BID` int(20) NOT NULL 
    AUTO_INCREMENT, 
    `BasketSessionID` varchar(100) NOT NULL DEFAULT '0', 
    `ProductCode` varchar(50) NOT NULL, 
    `Quantity` int(20) NOT NULL, 
    `AfterDiscount` double NOT NULL DEFAULT '0', 
    `ProductCost` double NOT NULL, 
    `SaleMode` varchar(10) NOT NULL DEFAULT 'p' COMMENT 'p Price f Free', 
    `BillType` varchar(5) NOT NULL DEFAULT 's' COMMENT 's sale r Returns', 
    `EntryUser` int(20) NOT NULL, 
    `EntryTimestamp` int(50) NOT NULL, 
    `EntryDate` datetime NOT NULL, 
    `UpdatedUser` int(20) NOT NULL, 
    `UpdatedDate` datetime NOT NULL, 
    `Status` int(3) NOT NULL DEFAULT '1', 
    PRIMARY KEY (`BID`) 
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=6 ; 

CREATE TABLE IF NOT EXISTS `tblcategory` (
    `CatID` int(11) NOT NULL AUTO_INCREMENT, 
    `CatName` varchar(20) NOT NULL, 
    `Discount` int(11) NOT NULL, 
    `EntryUser` int(10) NOT NULL, 
    `EntryDate` datetime NOT NULL, 
    `UpdateUser` int(20) NOT NULL, 
    `UpdatedDate` datetime NOT NULL, 
    `Status` int(3) NOT NULL DEFAULT '1', 
    PRIMARY KEY (`CatID`), 
    KEY `CatName` (`CatName`) 
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=11 ; 

CREATE TABLE IF NOT EXISTS `tblsale` (`SaleID` int(20) NOT NULL AUTO_INCREMENT, 
    `BillNo` varchar(30) NOT NULL DEFAULT '0', 
    `BasketSessionID` varchar(200) NOT NULL, 
    `AfterDiscount` double NOT NULL, 
    `ProductCost` double NOT NULL, `VAT` int(20) NOT NULL DEFAULT '0', 
    `BillType` varchar(5) NOT NULL DEFAULT 's' COMMENT 'same like tblbasket table', 
    `EntryUser` int(20) NOT NULL, 
    `EntryDate` datetime NOT NULL, 
    `UpdatedUser` int(20) NOT NULL, 
    `UpdateDate` datetime NOT NULL, 
    `OfficeNotesTS` text NOT NULL, 
    `Status` int(5) NOT NULL DEFAULT '1', 
    PRIMARY KEY (`SaleID`), 
    UNIQUE KEY `BillNo` (`BillNo`), 
    UNIQUE KEY `BasketSessionID` (`BasketSessionID`) 
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=5 ; 

CREATE TABLE IF NOT EXISTS `tblstock` (
    `StockID` int(20) NOT NULL AUTO_INCREMENT, 
    `ProductCode` varchar(50) NOT NULL,   
    `ManufacturerID` int(20) NOT NULL, 
    `CategoryID` int(20) NOT NULL, 
    `ProductTitle` varchar(150) NOT NULL, 
    `Timestamp` int(50) NOT NULL, 
    `EntryUser` int(20) NOT NULL, 
    `EntryDate` datetime NOT NULL, 
    `UpdateUser` int(20) NOT NULL, 
    `UpdatedDate` datetime NOT NULL, 
    `Status` int(3) NOT NULL DEFAULT '1', 
    PRIMARY KEY (`StockID`), 
    KEY `ManufacturerID` (`ManufacturerID`), 
    KEY `CategoryID` (`CategoryID`) 
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=2175 ; 

CREATE TABLE IF NOT EXISTS `tblstockhistory` (
`STID` int(20) NOT NULL AUTO_INCREMENT, 
    `StockID` int(20) NOT NULL, 
    `SupplierID` int(20) NOT NULL, 
    `InvoiceNO` varchar(20) NOT NULL, 
    `InvoiceDate` datetime NOT NULL, 
    `InvoiceAmount` float NOT NULL DEFAULT '0', 
    `Quantity` int(20) NOT NULL, 
    `Cost` float NOT NULL, 
    `MRP` float NOT NULL, 
    `Discount` int(20) NOT NULL DEFAULT '0', 
    `VAT` float NOT NULL, 
    `EntryUser` int(10) NOT NULL, 
    `EntryDate` datetime NOT NULL, 
    `UpdateUser` int(20) NOT NULL, 
    `UpdatedDate` datetime NOT NULL, 
    `Status` int(10) NOT NULL DEFAULT '1', 
    PRIMARY KEY (`STID`), 
    KEY `StockID` (`StockID`) 
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=2190 ; 

ALTER TABLE `tblstock` 
    ADD CONSTRAINT `tblStock_ibfk_1` 
    FOREIGN KEY (`ManufacturerID`) 
    REFERENCES `tblmanufacturer` (`ManufacturerID`); 

ALTER TABLE `tblstockhistory` 
    ADD CONSTRAINT `tblStockHistory_ibfk_1` 
    FOREIGN KEY (`StockID`) 
    REFERENCES `tblstock` (`StockID`); 

Answer 1

попробовать что-то вроде этого (его трудно понять без внешнего ключа, и немного объяснить):

SELECT st.CategoryID,SUM(b.ProductCost*b.Quantity) FROM tblsale s 
LEFT JOIN tblbasket b ON b.BasketSessionID = s.BasketSessionID 
LEFT JOIN tblstock st ON st.ProductCode = b.ProductCode GROUP BY st.CategoryID