├── README.md
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/README.md:
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  1 | # Ecommerce Management DBMS Project
  2 | 
  3 | As a part of our University Curriculum, we made this project for Database Management Systems (DBMS) - ITE1003.<br>
  4 | This project contains theoretical as well as implementation in SQL.<br>
  5 | If you liked the repo do :star: it. 
  6 | 
  7 | ## Pre-requisite
  8 | 
  9 | Oracle SQL Server (or) Oracle Community Edition
 10 | 
 11 | ## Contents
 12 | 
 13 | - Mini world and Project Description
 14 | - Basic structure
 15 |   - Functional requirements
 16 |   - Entity Relation (ER) diagram and constraints
 17 |   - Relational database schema
 18 | - Implementation
 19 |   - Creating tables
 20 |   - Inserting data
 21 | - Queries
 22 |   - Basic queries
 23 |   - PL/SQL function
 24 |   - Trigger function
 25 | 
 26 | ## 1. Mini world and Description
 27 | 
 28 | In this modern era of online shopping no seller wants to be left behind, moreover due to its simplicity the shift from offline selling model to an online selling model is witnessing a rampant growth.<br>
 29 | Therefore, as an engineer our job is to ease the path of this transition for the seller.
 30 | Amongst many things that an online site requires the most important is a database system. Hence in this project we are planning to design a database where small clothing sellers can sell their product online.
 31 | 
 32 | ## 2. Basic Structure
 33 | 
 34 | ### 2.1 Functional requirement
 35 | 
 36 | - A new user can register on the website.
 37 | - A customer can see details of the product present in the cart
 38 | - A customer can view his order history.
 39 | - Admin can start a sale with certain discount on every product.
 40 | - Customer can filter the product based on the product details.
 41 | - A customer can add or delete a product from the cart.
 42 | - A seller can unregister/ stop selling his product.
 43 | - A seller/ customer can update his details.
 44 | - Admin can view the products purchased on particular date.
 45 | - Admin can view number of products sold on a particular date.
 46 | - A customer can view the total price of product present in the cart unpurchased.
 47 | - Admin can view details of customer who have not purchased anything.
 48 | - Admin can view total profit earned from the website.
 49 | 
 50 | ### 2.2 Entity Relation Diagram
 51 | 
 52 | ![ER diagram](https://github.com/bhumijgupta/Ecommerce-management-DBMS-project/raw/master/images/new_er.png)
 53 | 
 54 | ### 2.3 Relational Database Schema
 55 | 
 56 | ![Relational diagram](https://github.com/bhumijgupta/Ecommerce-management-DBMS-project/raw/master/images/new_relational.png)
 57 | 
 58 | ## 3. Implementation
 59 | 
 60 | You can directly copy and paste all the commands from the text given here into the SQL console to create and insert values into your table.
 61 | 
 62 | ### 3.1 Creating Tables
 63 | 
 64 | ```sql
 65 |     CREATE TABLE Cart
 66 |     (
 67 |         Cart_id VARCHAR(7) NOT NULL,
 68 |         PRIMARY KEY(Cart_id)
 69 |     );
 70 | 
 71 |     CREATE TABLE Customer
 72 |     (
 73 |         Customer_id VARCHAR(6) NOT NULL,
 74 |         c_pass VARCHAR(10) NOT NULL,
 75 |         Name VARCHAR(20) NOT NULL,
 76 |         Address VARCHAR(20) NOT NULL,
 77 |         Pincode NUMBER(6) NOT NULL,
 78 |         Phone_number_s number(10) NOT NULL,
 79 |         PRIMARY KEY (Customer_id),
 80 |         Cart_id VARCHAR(7) NOT NULL,
 81 |         FOREIGN KEY(Cart_id) REFERENCES cart(Cart_id)
 82 |     );
 83 | 
 84 |     CREATE TABLE Seller
 85 |     (
 86 |         Seller_id VARCHAR(6) NOT NULL,
 87 |         s_pass VARCHAR(10) NOT NULL,
 88 |         Name VARCHAR(20) NOT NULL,
 89 |         Address VARCHAR(10) NOT NULL,
 90 |         PRIMARY KEY (Seller_id)
 91 |     );
 92 | 
 93 |     CREATE TABLE Seller_Phone_num
 94 |     (
 95 |         Phone_num NUMBER(10) NOT NULL,
 96 |         Seller_id VARCHAR(6) NOT NULL,
 97 |         PRIMARY KEY (Phone_num, Seller_id),
 98 |         FOREIGN KEY (Seller_id) REFERENCES Seller(Seller_id)
 99 |         ON DELETE CASCADE
100 |     );
101 | 
102 |     CREATE TABLE Payment
103 |     (
104 |         payment_id VARCHAR(7) NOT NULL,
105 |         payment_date DATE NOT NULL,
106 |         Payment_type VARCHAR(10) NOT NULL,
107 |         Customer_id VARCHAR(6) NOT NULL,
108 |         Cart_id VARCHAR(7) NOT NULL,
109 |         PRIMARY KEY (payment_id),
110 |         FOREIGN KEY (Customer_id) REFERENCES Customer(Customer_id),
111 |         FOREIGN KEY (Cart_id) REFERENCES Cart(Cart_id),
112 |         total_amount numeric(6)
113 |     );
114 | 
115 |     CREATE TABLE Product
116 |     (
117 |         Product_id VARCHAR(7) NOT NULL,
118 |         Type VARCHAR(7) NOT NULL,
119 |         Color VARCHAR(15) NOT NULL,
120 |         P_Size VARCHAR(2) NOT NULL,
121 |         Gender CHAR(1) NOT NULL,
122 |         Commission NUMBER(2) NOT NULL,
123 |         Cost NUMBER(5) NOT NULL,
124 |         Quantity NUMBER(2) NOT NULL,
125 |         Seller_id VARCHAR(6),
126 |         PRIMARY KEY (Product_id),
127 |         FOREIGN KEY (Seller_id) REFERENCES Seller(Seller_id)
128 |         ON DELETE SET NULL
129 |     );
130 | 
131 |     CREATE TABLE Cart_item
132 |     (
133 |         Quantity_wished NUMBER(1) NOT NULL,
134 |         Date_Added DATE NOT NULL,
135 |         Cart_id VARCHAR(7) NOT NULL,
136 |         Product_id VARCHAR(7) NOT NULL,
137 |         FOREIGN KEY (Cart_id) REFERENCES Cart(Cart_id),
138 |         FOREIGN KEY (Product_id) REFERENCES Product(Product_id),
139 |         Primary key(Cart_id,Product_id)
140 |     );
141 | 
142 |     alter table Cart_item add purchased varchar(3) default 'NO';
143 | ```
144 | 
145 | ### 3.2 Inserting Values
146 | 
147 | These are some demo values. Full data will be updated in future commits
148 | 
149 | ```sql
150 |     insert into Cart values('crt1011');
151 | 
152 |     insert into Customer values('cid100','ABCM1235','rajat','G-453','632014',9893135876, 'crt1011');
153 | 
154 |     insert into Seller values('sid100','12345','aman','delhi cmc');
155 | 
156 |     insert into Product values('pid1001','jeans','red','32','M',10,10005,20,'sid100');
157 | 
158 |     insert into Seller_Phone_num values('9943336206','sid100');
159 | 
160 |     insert into Cart_item values(3,to_date('10-OCT-1999','dd-mon-yyyy'),'crt1011','pid1001','Y');
161 | 
162 |     insert into Payment values('pmt1001',to_date('10-OCT-1999','dd-mon-yyyy'),'online','cid100','crt1011',NULL);
163 | ```
164 | 
165 | ## 4. Queries
166 | 
167 | ### 4.1 Basic Queries
168 | 
169 | #### If the customer wants to see details of product present in the cart
170 | 
171 | ```sql
172 |     select * from product where product_id in(
173 |         select product_id from Cart_item where (Cart_id in (
174 |             select Cart_id from Customer where Customer_id='cid100'
175 |         ))
176 |     and purchased='NO');
177 | ```
178 | 
179 | #### If a customer wants to see order history
180 | 
181 | ```sql
182 |     select product_id,Quantity_wished from Cart_item where (purchased='Y' and Cart_id in (select Cart_id from customer where Customer_id='cid101'));
183 | ```
184 | 
185 | #### Customer wants to see filtered products on the basis of size,gender,type
186 | 
187 | ```sql
188 |     select product_id, color, cost, seller_id from product where (type='jeans' and p_size='32' and gender='F' and quantity>0)
189 | ```
190 | 
191 | #### If customer wants to modify the cart
192 | 
193 | ```sql
194 |     delete from cart_item where (product_id='pid1001' and Cart_id in (select cart_id from Customer where Customer_id='cid100'));
195 | ```
196 | 
197 | #### If a seller stops selling his product
198 | 
199 | ```sql
200 |     delete  from seller where seller_id = 'sid100';
201 |     update product set quantity = 00 where seller_id is NULL;
202 | ```
203 | 
204 | #### If admin want to see what are the product purchased on the particular date
205 | 
206 | ```sql
207 |     select product_id from cart_item where (purchased='Y' and date_added='12-dec-2018');
208 | ```
209 | #### How much product sold on the particular date
210 | 
211 | ```sql
212 |     select count(product_id) count_pid,date_added from Cart_item where purchased='Y'  group by(date_added);
213 | ```
214 | #### If a customer want to know the total price present in the cart
215 | 
216 | ```sql
217 |     select sum(quantity_wished * cost) total_payable from product p join cart_item c on p.product_id=c.product_id where c.product_id in (select product_id from cart_item where cart_id in(select Cart_id from customer where customer_id='cid101') and purchased=’Y’);
218 | ```
219 | #### Show the details of the customer who has not purchased any thing
220 | 
221 | ```sql
222 |     Select * from customer where customer_id not in (select customer_id from Payment);
223 | ```
224 | #### Find total profit of the website from sales.
225 | 
226 | ```sql
227 |     select sum(quantity_wished * cost * commission/100) total_profit from product p join cart_item c on p.product_id=c.product_id where purchased=’Y’;
228 | ```
229 | 
230 | ### 4.2 PL/SQL function
231 | #### Procedure which returns the type of product with  the cost less than the given cost
232 | 
233 | ```sql
234 |     create or replace procedure cost_filter(c in number,t in varchar)
235 |     is
236 |     cs product.cost%type;
237 |     ty product.type%type;
238 |     id product.product_id%type;
239 |     cursor cf is
240 |     select product_id,cost,type from product where cost<c and type=t;
241 |     begin
242 |     open cf;
243 |     loop
244 |     fetch cf into id,cs,ty;
245 |     exit when cf%notfound;
246 |     dbms_output.put_line('Product' || id || 'has cost ' || cs || ' and the type is' || ty);
247 |     end loop;
248 |     close cf;
249 |     exception
250 |     when no_data_found then
251 |     dbms_output.put_line('Sorry no such products exist');
252 |     end;
253 | 
254 | ```
255 | 
256 | #### Function which returns total number of products which a particular seller sells
257 | 
258 | ```sql
259 |     create or replace function totalProducts(sId in varchar)
260 |     return number
261 |     is
262 |     total number(2):=0;
263 |     begin
264 |     select count(*) into total
265 |     from product
266 |     where seller_id=sId;
267 |     return total;
268 |     end;
269 |     /
270 | ```
271 | Function execution:
272 | ```sql
273 |     declare
274 |     c number(2);
275 |     begin
276 |     c:=totalProducts('sid102');
277 |     dbms_output.put_line('Total products is : '|| c);
278 |     end;
279 | ```
280 | 
281 | #### Procedure which returns the total quantity of product with the given ID
282 | Procedure with exception handling
283 | ```sql
284 |     create or replace procedure prod_details(p_id in varchar)
285 |     is
286 |     quan number(2);
287 |     begin
288 |     select quantity into quan from product where product_id=p_id;
289 |     exception
290 |     when no_data_found then
291 |     dbms_output.put_line('Sorry no such product exist !!');
292 |     end;
293 |     /
294 | ```
295 | ### 4.3 Triggers
296 | #### Trigger that will execute before inserting new customer to database and inserting a new cartId to the cart_items table
297 | Function to count number of cart items
298 | ```sql
299 |     create or replace function numCartId(cd in varchar)
300 |     return number
301 |     is
302 |     total number(2):=0;
303 |     begin
304 |     select count(*) into total
305 |     from cart_item
306 |     where cart_id=cd;
307 |     return total;
308 |     end;
309 |     Trigger
310 |     Create or replace trigger before_customer
311 |     before insert
312 |     on
313 |     customer
314 |     for each row
315 |     declare
316 |     c varchar(10);
317 |     n number(2);
318 |     begin
319 |     c:= :new.cart_id;
320 |     n:=numCartId(c);
321 |     if n>0 then
322 |     dbms_output.put_line('Sorry');
323 |     end if;
324 |     insert into cart values(c);
325 |     end;
326 | ```
327 | #### Trigger to update the total amount of user everytime he adds something to payment table
328 | ```sql
329 |     create or replace function total_cost(cId in varchar)
330 |     return number
331 |     is
332 |     total number(2) :=0;
333 |     begin
334 |     select sum(cost) into total from product,cart_item where product.product_id=cart_item.product_id and cart_id=cId;
335 |     return total;
336 |     end;
337 | 
338 |     create or replace trigger before_pay_up
339 |     before insert
340 |     on
341 |     payment
342 |     for each row
343 |     declare
344 |     total number(3);
345 |     begin
346 |     total :=total_cost(:new.cart_id);
347 |     insert into payment values(:new.payment_id,:new.payment_date,:new.payment_type,:new.customer_id,:new.cart_id,total);
348 |     end;
349 | ```
350 | ## Contributors
351 | Do check the contributors to follow some awesome projects
352 | 
353 | - [@bhumijgupta](https://www.github.com/bhumijgupta)
354 | - [@YashMeh](https://www.github.com/YashMeh)
355 | - [@roney_b](https://www.github.com)
356 | 
357 | > Feel free to fork the repository and contribute to this project.
358 | You made it till the end. Brofist :punch:!!!
359 | 


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