SQL.. AN OVERVIEW lecture3 1. Overview of SQL 2  Query: allow questions to be asked of the data and display only the information required. It can include.

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Presentation transcript:

SQL.. AN OVERVIEW lecture3 1

Overview of SQL 2  Query: allow questions to be asked of the data and display only the information required. It can include info from more the one table  Why Query language? A Database Management system enable users to access and manipulate data using queries.  Structured Query Language (SQL): is the language used by most relational database systems.

Features of SQL 3  What is SQL?  SQL stands for Structured Query Language  SQL lets you access and manipulate databases  SQL is an ANSI (American National Standards Institute) standard

Features of SQL 4  What Can SQL do?  SQL can execute queries against a database  SQL can retrieve data from a database  SQL can insert records in a database  SQL can update records in a database  SQL can delete records from a database  SQL can create new databases  SQL can create new tables in a database  SQL can create stored procedures in a database  SQL can create views in a database  SQL can set permissions on tables, procedures, and views

Features of SQL 5  What Makes SQL Special?  SQL is an English-like language. It uses words such as select, insert, delete as part of its command set  SQL is a non-procedural language: you specify What information you require, not how to get it. This feature makes it easier for you to concentrate on obtaining the desired result.  SQL Processes sets of records rather than a single record at a time.  SQL can be used by a range of users including DBA’s, programmers, Management Personnel, and many other types of end users

Types of SQL Statements 6  Data Definition Language (DDL): Commands that define a database. E.g. CREATE, ALTER, DROP,...etc.  Data manipulation language (DML): Commands that maintain and query a database. E.g. SELECT, INSERT, UPDATE, DELETE.  Data Control Language (DCL): Commands that control a database, including administering privileges and committing data. E.g. CONNECT, GRANT, REVOKE,...etc.

Writing SQL Commands 7 SQL commands maybe one or more lines Command words cannot be split across lines SQL Commands are not case sensitive Place a semi –colon(;) at the end of last clause.

8 Both give the same result not case sensitive)