tolong di koreksi yahhh :)

===============mulai=================
CREATE PROCEDURE sp_Perhitungan_Stok 
@kdbarang char(15),
@barangdibeli float,
@jlm float
AS
if @jlm = ''
begin
    declare @max1 float
    select @max1=sum(jumlah) from t_fifo where kdbarang = @kdbarang
select @[EMAIL PROTECTED]
end

update tabel_stock 
set qty = (@jlm - @barangdibeli) where kdbrg = @kdbarang and status = 'A'
===============selesai====================

disini ada 2 tabel
1 tabel fifo (setiap barang masuk di buat record baru)
2 tabel stok (setiap barang masuk di jumlahkan barang masuk + barang yg ada)
di kasir saya memakai tabel fifo untuk transaksi
contoh kasus:
tabel fifo ada 2record :   qty =1 kdbrg=01
                                             qty = 9 kdbrg=01
pertanyaan saya kenapa
pada saat transaksi saya memilih qty yg 9 tapi kenapa tabel stoknya 8 yah bukan 
9

tolong bantuannya THX



 
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