Update README.md

Author: Shantanu36

README.md

@@ -1,9 +1,8 @@
-# SQLBasics
---- Creating A Database---
+--- Creating A Database
 
 Create Database SampleGitHub
 
---- Creating a table inside above database and creating columns--
+--- Creating a table inside above database and creating columns
 
 create table Customer
 ( CustomerName varchar(20),
@@ -12,7 +11,7 @@ create table Customer
  )
 
 
- ---Inserting values inside a table--
+ ---Inserting values inside a table
 
  insert into Customer (CustomerName,CustomerSurname,Age)
  VALUES ( 'shantanu','jadhav',30);
@@ -32,3 +31,174 @@ insert into Customer (CustomerName,CustomerSurname,Age)
 
 
 
+ --- Using where clause to display perticular rows
+ 
+
+
+ select * from customer
+ where CustomerName='Amol'
+
+ --- Using AND/OR Operator along with where clause
+
+ select * from customer
+ where CustomerName='shantanu'      /* AND OPERATOR */
+ and age=30
+
+ select * from customer
+ where CustomerName ='swapnil'      /* OR OPERATOR */
+ or age ='31'
+
+ ---Using LIKE  OPERATOR
+  select * from customer             /*  LIKE OPERATOR */
+ where  CustomerSurname like 'a%'    /* selects Customers with surname starting with 'a' */
+ 
+ ---Using Like and '-' operators
+ select * from Customer
+ where  CustomerSurname like '_a%'       /* selects surnames having 2nd character as 'a' */
+
+
+ ---Using UPDATE commands for  Updating rows and changing values in columns 
+
+ Update Customer
+ set age=31
+ where CustomerName = 'shantanu'
+
+ ---Deleting complete data from the table 
+
+ Delete Customer 
+
+ ---Deleting a particular row/rows from the table
+ Delete from Customer
+ where CustomerName= 'shantanu'
+
+ ---Deleting whole table
+  Drop table Customer
+
+  --Altering table/ adding  one or more new columns wo the table
+
+  Alter table Customer
+  add City varchar (20)
+
+  select * from Customer
+
+  UPDATE customer SET City = 'Mumbai' where CustomerName='shantanu'
+
+  /* places city as 'Mumbai' in the all the null values inside city column */
+
+  UPDATE customer SET City = 'nashik' where CustomerName='swapnil'
+  
+  UPDATE customer SET City = 'Mumbai' where CustomerName='kruz'
+  
+  UPDATE customer SET City = 'nagpur' where CustomerName='amol'
+  
+  UPDATE customer SET City = 'thane' where CustomerName='pratik'
+
+  select * from Customer
+
+  /*Adding Primary Key to the current table*/
+
+
+  Alter table customer
+  add CustomerID int primary key identity (1,1)
+
+
+  -- Creating PRODUCT and ORDERS table
+
+
+ CREATE TABLE PRODUCT
+ (
+ ProductID int primary key identity (1,1),
+ productname varchar (20),
+ productprice int
+ )
+
+ insert into PRODUCT (productname,productprice)
+ values ('bat',30);
+  insert into PRODUCT (productname,productprice)
+ values ('ball',10);
+  insert into PRODUCT (productname,productprice)
+ values ('stumps',3300);
+  insert into PRODUCT (productname,productprice)
+ values ('gloves',80);
+  insert into PRODUCT (productname,productprice)
+ values ('shoes',400)
+                                 
+								 
+select * from PRODUCT
+
+
+
+create table orders 
+( 
+OrderID int primary key identity (1,1),
+OrderDate datetime,
+C_ID int,
+P_ID int
+)
+
+
+select * from orders
+select * from PRODUCT
+select * from customer
+
+
+---creating relationship between all 3 tables above i.e. Creating Foreign Key
+  
+  alter table orders
+  add foreign key (C_ID) references customer (CustomerID) 
+  /* Creates Foreign key in the orders table with reference to Customer table primary key*/
+
+  alter table orders
+  add foreign key (P_ID) references PRODUCT (ProductID)
+  /* Creates Foreign key in the orders table with reference to Product table primary key*/
+
+  insert into orders (OrderDate,C_ID,P_ID)
+  values (GetDate(),2,3);
+  insert into orders (OrderDate,C_ID,P_ID)
+  values (GetDate(),1,4);
+insert into orders (OrderDate,C_ID,P_ID)
+  values (GetDate(),3,2);
+  insert into orders (OrderDate,C_ID,P_ID)
+  values (GetDate(),5,4);
+  insert into orders (OrderDate,C_ID,P_ID)
+  values (GetDate(),5,1)
+
+
+
+
+
+---Creating JOINS between above 3 tables
+
+select * from orders
+inner join PRODUCT on orders.P_ID=PRODUCT.ProductID
+INNER JOIN customer on orders.C_ID=customer.customerID
+
+
+
+-- writing same above code using alias and selecting particular columns
+
+
+select O.orderDate,C.CustomerName,P.productname,P.productprice
+from orders as O inner join PRODUCT as P on O.P_ID=P.ProductID
+INNER JOIN customer AS C on O.C_ID=C.customerID
+
+
+
+
+--Trying out above table with few aggregate functions  and group by
+
+select C.CustomerName,sum(P.productprice)as total /* Using aggregate function 'SUM','AVG' */
+from orders as O inner join PRODUCT as P on O.P_ID=P.ProductID
+INNER JOIN customer AS C on O.C_ID=C.customerID
+GROUP BY CustomerName
+
+select P.productname,AVG(P.productprice)as total /* Using aggregate function 'SUM','AVG' */
+from orders as O inner join PRODUCT as P on O.P_ID=P.ProductID
+INNER JOIN customer AS C on O.C_ID=C.customerID
+GROUP BY productname
+
+
+
+
+
+