creating customer database

Author: appu22

airthmatic.sql

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+select 5-6 as substarction, 5+5 as addition ,5*6 as multiplication , 20/2 as division;
+
+select 5>6 as greaterthan;
+select 5<6 as lessthan;
+
+select 9 >= 10 as lessthanequalto; 
+
+select 25=25 as comparetwovalues;
+
+select 5=6 && 1=2 as result;
+
+select 5=5 AND 1=1 as result , 5=5 OR 1=2 as result;
+
+select !0 as result , !1 ;
+
+
+
+

customer.sql

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+create database CUSTOMER;
+create table customer_details(
+	CUSTOMER_IDcustomer_detailscustomer_detailscustomer_details int ,
+	CUSTOMER_Name varchar(15),
+	CUSTOMER_Number bigint,
+	CUSTOMER_Address varchar(200)
+    
+);
+select * from customer_details;
+
+desc customer_details;
+
+create table customer_order(
+customer_order_ID int,
+customer_order_Name varchar(15),
+customer_order_Price double
+
+);
+
+select * from customer_order;
+
+desc customer_order;
+show columns from customer_order;
+
+create table customer_transaction(
+transaction_Id int ,
+transaction_Time time unique,
+transaction_Amount double check (transaction_Amount>1),
+transaction_Type varchar(10) not null,
+transaction_status boolean,
+primary key (transaction_Id)
+);
+desc customer_transaction;
+
+alter table customer_transaction modify transaction_status boolean  default false;
+desc customer_transaction;
+alter table customer_transaction modify transaction_status varchAR(20)  default false;
+desc customer_transaction;
+alter table customer_transaction add transaction_Addreses varchAR(20)  not null;
+alter table customer_transaction drop transaction_Addreses;
+desc customer_transaction;
+show tables;
+
+create table  product(
+product_id int,
+product_Name varchar(15),
+product_price double,
+primary key (product_id)
+);
+show tables;
+select * from product;
+drop table  product;
+create database student;
+
+drop database student;
+
+alter table product rename to product_Details;
+alter table product_details rename column product_price to productPRice;
+desc product_details;
+alter table product_details rename column product_price to product_Price;
+insert into product_details (product_id,product_Name,productPRice) values (1,'tv',15000.0);
+insert into product_details (product_id,product_Name,productPRice) values (2,"watch",4500.0);
+insert into product_details (product_id,product_Name,productPRice) values (3,'MObile',10000.0);
+-- insert into product_details values (4,'Bike',450000.0),(5,'Sanitizer',50);  
+insert into product_details (product_id,productPRice) values (5,15000.0);
+select * from product_details;
+
+-- delete the table records ------------------------------
+truncate product_details;
+select * from product_details;
+-- -------------------------------------------------------- 
+
+
+
+
+
+
+
+

sql.txt

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+SQL : 
+Data -->
+DataBase -->
+RDBMS --->
+DT----------------------------
+		integer-	BigINT,smallInt,int , tiny int -->127 to -128
+		String - 	Character -->size[255]
+		integer+String->	Address-->VarChar size[255]
+		integer+String->	text -->n number of lines 
+		folating------->	float,double,decimal
+		boolean-------->	true , false
+		
+		Date ----------->  date,datetime,time,timestamp
+---------------------------------
+Opeartions
+		Airthmatic 
+		comparative /relatives ope
+		logical--And -(both) OR--(one) NOT ()
+		AND -----both side will be true--0
+		OR ------One side will be true --1
+		
+SCHEMAS ---it is collection of DATABASE 
+	Database --
+	logical structure   ---tables ,database
+	phyical structure   ---size , memory 
+	
+	
+	keywords
+	
+	fasle---0
+	true---1
+	
+	declarative ---how to do not saying what to do 
+	
+	Types of commands 
+		create ---database ,tables
+		database
+		syntax : - create database databaseName;
+tables	
+		create table tablename(
+		//query
+		
+		);
+		
+		
+		example: create database customer;
+		
+		create table customer_Details(
+		customer_ID int ,//int size defaultt 11
+		customer_name varchar(15)//name should be less than 15 character
+		customer_number bigint,
+		customer_Address varchar(200)
+	);
+	select * from customer_details;//tables view 
+	desc customer_details;//table description
+	show columns from customer_order;//columns
+	constraint //not null 
+				keywords/rule to write 
+	unique----id should be 
+	
+	check ----restrict the timings 
+			condition, check age >18	
+	
+	primary key-- combination of is not null and unique
+	
+	foreign key --parent to child (any properties u can make it as primary key)
+	
+	alter--->it is change the structure of the table 
+	
+	modify---
+	alter table customer_transaction modify transaction_status boolean  default false;
+	
+	add----
+	alter table customer_transaction add transaction_Addresee varchAR(20)  not null;
+	
+	drop-----
+	alter table customer_transaction drop transaction_Addreses;
+	desc---
+	desc customer_transaction;
+	
+11/04/2021
+Administartive commonds
+		show databases  it wil show the all database name 
+		show tables
+DDL -- data defination language -----create ,alter,drop,
+DML -- data manipulation language ---insert, 
+
+reaname table 
+		alter table product rename to product_Details;
+rename column name 		
+		alter table product_details rename column product_price to productPRice;
+truncate		
+			
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