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1907105DDL.sql

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+drop table managements;
+drop table payment;
+drop table product_availability;
+drop table orders;
+drop table product;
+drop table buyerinfo;
+
+
+
+--Buyer_info table created
+create table buyerinfo(
+Buyer_ID number(30) NOT NULL CHECK (Buyer_ID >0) PRIMARY KEY,
+Buyer_Name varchar(40) NOT NULL,
+Buyer_Address varchar(40) NOT NULL,
+Buyer_email varchar(40) NOT NULL,
+Buyer_phone varchar(11) NOT NULL CHECK(Length(Buyer_phone)=11)
+);
+--Product table created
+create table Product(
+Product_ID varchar(40) NOT NULL Primary key,
+Product_type varchar(40),
+Product_Name varchar(40),
+Price DECIMAL (10,2) NOT NULL CHECK(Price>=0),
+Product_Brand varchar(40)
+);
+--Order table created
+create table orders(
+Buyer_ID number(30) NOT NULL CHECK (Buyer_ID >0),
+Order_ID number(30) NOT NULL CHECK (Order_ID >0),
+Product_ID varchar(40) NOT NULL ,
+Quantity INT DEFAULT 1 NOT NULL Check (Quantity>=1) ,
+Product_status varchar(40),
+order_date date NOT NULL,
+Primary key (order_id),
+foreign key (Buyer_ID) references buyerinfo(Buyer_ID) on delete cascade,
+foreign key (Product_ID) references product(Product_ID) on delete cascade
+);
+--Product Availability table created
+create table product_availability(
+Product_ID varchar(40) NOT NULL,
+Product_availabilityID varchar(40) NOT NULL Check(Product_availabilityID in ('Available','Unavailable')) ,
+Product_details varchar (120),
+Primary Key (Product_ID),
+foreign key (Product_ID) references product(Product_ID) on delete cascade
+);
+--Payment table created
+create table payment(
+order_id number(30) NOT NULL CHECK (Order_ID >0),
+Payment_ID varchar(40) NOT NULL ,
+Payment_Type varchar(40) NOT NULL Check(Payment_Type in ('Credit Card','Cash','Mastercard','Visa Card','Mobile Banking','Debit Card')),
+Payment_amount DECIMAL (10,2) DEFAULT 0 CHECK(Payment_amount>=0) ,
+Primary key(ORDER_ID,Payment_ID),
+foreign key (order_id) references orders(order_id) on delete cascade
+);
+--Managements table created
+create table managements(
+Salesman_name varchar(40),
+Buyer_ID number(30) NOT NULL CHECK (Buyer_ID >0),
+order_id number(30) NOT NULL CHECK (Order_ID >0),
+Payment_ID varchar(40) NOT NULL ,
+Payment_Date date  ,
+foreign key (buyer_ID) references buyerinfo(buyer_id) on delete cascade,
+foreign key (order_ID,Payment_ID) references Payment(order_ID,Payment_ID) on delete cascade
+);
+
+--Altering-adding managers column to existing managements table
+alter table managements add managers char(20);
+describe managements;
+
+--Altering-modifying managers column from char to varchar on existing managements table
+alter table managements modify managers varchar(40);
+describe managements;
+
+--Altering-renaming managers column to managers_name column on existing managements table
+alter table managements rename column managers to managers_name;
+describe managements;
+
+--Altering-dropping managers column from existing managements table
+alter table managements drop column managers_name;
+describe managements;