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Old December 12th, 2003, 10:58 PM
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Default mysql discount table

my tables are as below.
CREATE TABLE PRODUCT
(
    PROD_ID VARCHAR(5) NOT NULL,
    PROD_NAME VARCHAR(20) NOT NULL,
    PROD_DESC VARCHAR(20) NOT NULL,
    PROD_PRICE DECIMAL NOT NULL,
    PROD_CAT INT NOT NULL,
    PRIMARY KEY(PROD_ID),
    FOREIGN KEY(PROD_CAT) REFERENCES CATEGORY,
);
CREATE TABLE SALES
(
    SALES_ID INT NOT NULL,
    SALES_DATE DATE NOT NULL,
    CUST_ID VARCHAR(5) NOT NULL,
    EMP_ID VARCHAR(6) NOT NULL,
    PRIMARY KEY(SALES_ID),
    FOREIGN KEY (CUST_ID) REFERENCES CUSTOMER,
    FOREIGN KEY (EMP_ID) REFERENCES EMPLOYEE,
);

CREATE TABLE SALES_DETAIL
(
    SALES_ID INT NOT NULL,
    PROD_ID VARCHAR(5) NOT NULL,
    QUANTITY INT NOT NULL,
    PRIMARY KEY (SALES_ID, PROD_ID),
);

if some of the product have discount for a duration of some time, should i create a product table?
CREATE TABLE DISCOUNT
(
    DISCOUNT_ID INT NOT NULL,
    PROD_ID VARCHAR(5) NOT NULL,
    START_DATE DATE NOT NULL,
    END_DATE DATE NOT NULL,
);

This is my sql queries without the discount table. if the discount table is created, how am i going to make changes to the query to count the total after deducted the discount?

select month(s.sales_date), s.cust_id, sum((p.prod_price * sd.quantity)) as Total
from product p, sales_detail sd, sales s, category c
where sd.sales_id=s.sales_id and p.prod_id=sd.prod_id and c.category_id=p.prod_cat and year(s.sales_date) = '1999'
group by month(s.sales_date), s.cust_id;








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