SQLJan 20,2014

DBMS

• Stores data as records, tables etc.

• Accepts data and stores that data for later use

• Uses query languages for searching, sorting, reporting etc and help users to make sense of collected data

• Provides multiuser access to data, along with security features

DBMS

ADVANTAGES

• Reduced updating errors • Systematic storage of data• Improved data access to users through use of query languages • Improved data security • Reduced data entry, storage, and retrieval costs • Helps in development of new applications program

RDBMS• Relational Database Management System

• RDBMS store the data into collection of tables, which might be related by common fields

• A RDBMS is a DBMS in which data is stored in the form of tables

• The relationship among the data is also stored in the form of tables.

Structured Query Language

• SQL stands for Structured Query Language. • SQL is used to communicate with a database.• It is the standard language for relational

database management systems• All SQL statements should end with a ";".

• SQL statements are used to perform tasks like

• Creating new database and tables• Deleting tables• update data on a database• retrieve data from a database etc.

Structured Query Language

Examples• Some common RDBMS that use SQL are: • Oracle, • Microsoft SQL Server, • My SQL • Access etc.

• SQL can be divided into two parts:

• The Data Manipulation Language (DML)

• The Data Definition Language (DDL).

Structured Query Language

Data Definition Language (DDL)

• The DDL part of SQL permits

• database tables to be created or deleted.

• defines indexes (keys),

• specify links between tables,

• imposes constraints between tables.

Data Manipulation Language (DML)

• The DML part of SQL permits

• Retrieving records.

• Updating records

• Adding new records,

• Deleting records etc.

DDL - CREATE TABLE • used to create a new table

• SYNTAX

• CREATE TABLE "table_name"("column 1" "data_type_for_column_1","column 2" "data_type_for_column_2",... )

DDL - CREATE TABLE • EXAMPLE

• CREATE TABLE customer(First_Name char(50),Last_Name char(50),Address char(50),City char(50),Country char(25),Birth_Date date,

Amount number(6)) ;

• Create a table ‘customer’ with fields First_Name, Last_Name, Address, City, Country, Birth_date, amount

DML - Insert into• used to insert a new row in a table

• Syntax:

• INSERT INTO "table_name" ("column1", "column2", ...) VALUES ("value1", "value2", ...)

DML - Insert into• Example:

• INSERT INTO Customers (First_Name ,Last_Name,Address ,City , Country, Birth_Date ,amount) VALUES(‘Roshan’,’Mathew’,’Palayam’,’Trivandrum’,’India’,’19-Jan-76’,2000);

Home Work

• Write SQL statement to create a table called ‘Friends_tb’ with fields Friend_name, Address, Phone, Email, Birthday

• Write Sql statements to Insert any two records