Implementation of methods in an abstract class

Question

Hi friends,

I want to know that Is it mandatory to implement all the methods which are there in abstract class if we inherit that abstract class? Please Explain in brief?

Answer 1

Do not execute this query directly first understand all statements and thing about your requirement... here is basic queries, let me know next queries later after understanding this...

--get current stock of product
Select ProductID, ProductName, ClosingStockQTy, ClosingStockRs from ProductMaster where Product = 1

--on purchase add stock
insert into Purchases (BillNo, BillDate, ProductID, Rate, Discount, Qty, TotalAmount)
values
(
    'CP1',
    getdate(),
    @ProductID,
    @Rate,
    @Discount,
    @Qty,
    @TotalAmount
)

declare @StockQTy as int=0;
set @StockQTy = (select top 1 ClosingStockQty from ProductMaster where ProductID = 1);
set @StockQTy = @StockQTy + @Qty;

Update ProductMaster
set
    ClosingStockQTy = @StockQTy
Where
    ProductID = 1


--on sale decrease stock
insert into Sales (BillNo, BillDate, ProductID, Rate, Discount, Qty, TotalAmount)
values
(
    'CS1',
    getdate(),
    @ProductID,
    @Rate,
    @Discount,
    @Qty,
    @TotalAmount
)

declare @StockQTy as int=0;
set @StockQTy = (select top 1 ClosingStockQty from ProductMaster where ProductID = 1);
set @StockQTy = @StockQTy - @Qty;

Update ProductMaster
set
    ClosingStockQTy = @StockQTy
Where
    ProductID = 1

Answer 2

You can use inner join and left join to get the result.

select PM.ProductID, PM.ProductName, PM.MRP,
Purchase.BillDate as PurchaseBillDate,Purchase.Rate as PurchaseRate,
Sales.BillDate as SalesBillDate,Sales.Rate as SalesRate
from Productmaster PM
inner join Purchase on PM.ProductID=Purchase.ProductID
left join Sales on PM.ProductID = Sales.ProductID
where PM.ProductID= 1000