Structured Query Language -SQL

Nov 27, 2019Download as pptx, pdf0 likes82 views

SQL is a database computer language designed for the retrieval and management of data in a relational database. SQL stands for Structured Query Language. This tutorial will give you a quick start to SQL. It covers most of the topics required for a basic understanding of SQL and to get a feel of how it works. #saurabhupadhyay

STRUCTURED QUERY
LANGUAGE-SQL
BY- SAURABH UPADHYAY

WHAT IS SQL ?
• SQL IS STRUCTURED QUERY LANGUAGE, WHICH IS A COMPUTER LANGUAGE FOR
STORING, MANIPULATING AND RETRIEVING DATA STORED IN A RELATIONAL
DATABASE.
• SQL IS THE STANDARD LANGUAGE FOR RELATIONAL DATABASE SYSTEM. ALL THE
RELATIONAL DATABASE MANAGEMENT SYSTEMS (RDMS) LIKE MYSQL, MS ACCESS,
ORACLE, SYBASE, INFORMIX, POSTGRESQL AND SQL SERVER USE SQL AS THEIR
STANDARD DATABASE LANGUAGE.
• ALSO, THEY ARE USING DIFFERENT DIALECTS, SUCH AS −
• MS SQL SERVER USING T-SQL,
• ORACLE USING PL/SQL,
• MS ACCESS VERSION OF SQL IS CALLED JET SQL (NATIVE FORMAT) ETC.

WHY SQL?
• SQL IS WIDELY POPULAR BECAUSE IT OFFERS THE FOLLOWING ADVANTAGES −
• ALLOWS USERS TO ACCESS DATA IN THE RELATIONAL DATABASE MANAGEMENT
SYSTEMS.
• ALLOWS USERS TO DESCRIBE THE DATA.
• ALLOWS USERS TO DEFINE THE DATA IN A DATABASE AND MANIPULATE THAT DATA.
• ALLOWS TO EMBED WITHIN OTHER LANGUAGES USING SQL MODULES, LIBRARIES &
PRE-COMPILERS.
• ALLOWS USERS TO CREATE AND DROP DATABASES AND TABLES.
• ALLOWS USERS TO CREATE VIEW, STORED PROCEDURE, FUNCTIONS IN A DATABASE.
• ALLOWS USERS TO SET PERMISSIONS ON TABLES, PROCEDURES AND VIEWS.

SQL PROCESS
• WHEN YOU ARE EXECUTING AN SQL COMMAND FOR ANY RDBMS, THE SYSTEM DETERMINES
THE BEST WAY TO CARRY OUT YOUR REQUEST AND SQL ENGINE FIGURES OUT HOW TO
INTERPRET THE TASK.
• THERE ARE VARIOUS COMPONENTS INCLUDED IN THIS PROCESS.
• THESE COMPONENTS ARE −
• QUERY DISPATCHER
• OPTIMIZATION ENGINES
• CLASSIC QUERY ENGINE
• SQL QUERY ENGINE, ETC.
• A CLASSIC QUERY ENGINE HANDLES ALL THE NON-SQL QUERIES, BUT A SQL QUERY ENGINE
WON'T HANDLE LOGICAL FILES.
• FOLLOWING IS A SIMPLE DIAGRAM SHOWING THE SQL ARCHITECTURE −

SQL COMMANDS
• THE STANDARD SQL COMMANDS TO INTERACT WITH RELATIONAL DATABASES
ARE CREATE, SELECT, INSERT, UPDATE, DELETE AND DROP. THESE COMMANDS
CAN BE CLASSIFIED INTO THE FOLLOWING GROUPS BASED ON THEIR NATURE −
• DDL - DATA DEFINITION LANGUAGE

WHAT IS A TABLE ?
• THE DATA IN AN RDBMS IS STORED IN DATABASE OBJECTS WHICH ARE CALLED
AS TABLES. THIS TABLE IS BASICALLY A COLLECTION OF RELATED DATA ENTRIES
AND IT CONSISTS OF NUMEROUS COLUMNS AND ROWS.
• REMEMBER, A TABLE IS THE MOST COMMON AND SIMPLEST FORM OF DATA
STORAGE IN A RELATIONAL DATABASE. THE FOLLOWING PROGRAM IS AN
EXAMPLE OF A CUSTOMERS TABLE −

WHAT IS A COLUMN ?
• A COLUMN IS A VERTICAL ENTITY IN A TABLE THAT CONTAINS ALL
INFORMATION ASSOCIATED WITH A SPECIFIC FIELD IN A TABLE.
• FOR EXAMPLE, A COLUMN IN THE CUSTOMERS TABLE IS ADDRESS, WHICH
REPRESENTS LOCATION DESCRIPTION AND WOULD BE AS SHOWN BELOW −

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Structured Query Language -SQL

1. STRUCTURED QUERY LANGUAGE-SQL BY- SAURABH UPADHYAY

2. WHAT IS SQL ? • SQL IS STRUCTURED QUERY LANGUAGE, WHICH IS A COMPUTER LANGUAGE FOR STORING, MANIPULATING AND RETRIEVING DATA STORED IN A RELATIONAL DATABASE. • SQL IS THE STANDARD LANGUAGE FOR RELATIONAL DATABASE SYSTEM. ALL THE RELATIONAL DATABASE MANAGEMENT SYSTEMS (RDMS) LIKE MYSQL, MS ACCESS, ORACLE, SYBASE, INFORMIX, POSTGRESQL AND SQL SERVER USE SQL AS THEIR STANDARD DATABASE LANGUAGE. • ALSO, THEY ARE USING DIFFERENT DIALECTS, SUCH AS − • MS SQL SERVER USING T-SQL, • ORACLE USING PL/SQL, • MS ACCESS VERSION OF SQL IS CALLED JET SQL (NATIVE FORMAT) ETC.

3. WHY SQL? • SQL IS WIDELY POPULAR BECAUSE IT OFFERS THE FOLLOWING ADVANTAGES − • ALLOWS USERS TO ACCESS DATA IN THE RELATIONAL DATABASE MANAGEMENT SYSTEMS. • ALLOWS USERS TO DESCRIBE THE DATA. • ALLOWS USERS TO DEFINE THE DATA IN A DATABASE AND MANIPULATE THAT DATA. • ALLOWS TO EMBED WITHIN OTHER LANGUAGES USING SQL MODULES, LIBRARIES & PRE-COMPILERS. • ALLOWS USERS TO CREATE AND DROP DATABASES AND TABLES. • ALLOWS USERS TO CREATE VIEW, STORED PROCEDURE, FUNCTIONS IN A DATABASE. • ALLOWS USERS TO SET PERMISSIONS ON TABLES, PROCEDURES AND VIEWS.

4. SQL PROCESS • WHEN YOU ARE EXECUTING AN SQL COMMAND FOR ANY RDBMS, THE SYSTEM DETERMINES THE BEST WAY TO CARRY OUT YOUR REQUEST AND SQL ENGINE FIGURES OUT HOW TO INTERPRET THE TASK. • THERE ARE VARIOUS COMPONENTS INCLUDED IN THIS PROCESS. • THESE COMPONENTS ARE − • QUERY DISPATCHER • OPTIMIZATION ENGINES • CLASSIC QUERY ENGINE • SQL QUERY ENGINE, ETC. • A CLASSIC QUERY ENGINE HANDLES ALL THE NON-SQL QUERIES, BUT A SQL QUERY ENGINE WON'T HANDLE LOGICAL FILES. • FOLLOWING IS A SIMPLE DIAGRAM SHOWING THE SQL ARCHITECTURE −

5. SQL ARCHITECTURE

6. SQL COMMANDS • THE STANDARD SQL COMMANDS TO INTERACT WITH RELATIONAL DATABASES ARE CREATE, SELECT, INSERT, UPDATE, DELETE AND DROP. THESE COMMANDS CAN BE CLASSIFIED INTO THE FOLLOWING GROUPS BASED ON THEIR NATURE − • DDL - DATA DEFINITION LANGUAGE

7. DML - DATA MANIPULATION LANGUAGE

8. DCL - DATA CONTROL LANGUAGE

9. WHAT IS A TABLE ? • THE DATA IN AN RDBMS IS STORED IN DATABASE OBJECTS WHICH ARE CALLED AS TABLES. THIS TABLE IS BASICALLY A COLLECTION OF RELATED DATA ENTRIES AND IT CONSISTS OF NUMEROUS COLUMNS AND ROWS. • REMEMBER, A TABLE IS THE MOST COMMON AND SIMPLEST FORM OF DATA STORAGE IN A RELATIONAL DATABASE. THE FOLLOWING PROGRAM IS AN EXAMPLE OF A CUSTOMERS TABLE −

10. WHAT IS A COLUMN ? • A COLUMN IS A VERTICAL ENTITY IN A TABLE THAT CONTAINS ALL INFORMATION ASSOCIATED WITH A SPECIFIC FIELD IN A TABLE. • FOR EXAMPLE, A COLUMN IN THE CUSTOMERS TABLE IS ADDRESS, WHICH REPRESENTS LOCATION DESCRIPTION AND WOULD BE AS SHOWN BELOW −

Structured Query Language -SQL

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Structured Query Language -SQL