Chapter 2: SQL – The Basics Objectives: 1.The SQL execution environment 2.SELECT statement 3.SQL Developer & SQL*Plus

Overview: SQL execution environment Oracle can run on many different OS Oracle databases server is where the Oracle DB software resides Oracle provides SQL Developer & SQL*Plus tools/interfaces for connecting with the DB & executing your SQL queries Other third party tools are available that are mentioned on Appendix H of the textbook

Let’s get started… Execution environment & setting up STUDENT schema Accessing Oracle database server Getting started with SQL Developer SQL and the Oracle database server Creating a database connection for SQL Developer Exploring database table objects Columns tab Data tab Grants tab Statistics tab Triggers, dependencies, indexes, flashbacks, and SQL tabs Details tab SQL Developer worksheet Results tab

Various SQL Developer Panes

Data types A data type determines the type of data that can be stored in a column. You must keep data types in mind especially when using comparison operators, in other words, comparing the values in two columns. DATE NUMBER CHAR VARCHAR2

SQL SELECT statement Components of a SELECT statement Selecting one, multiple or all columns Eliminating duplicates with DISTINCT or UNIQUE

SQL Worksheet Icons Constructing & formatting SQL SELECT statement in SQL Developer Execute Statement Run Script Commit Rollback Cancel Execute Explain Plan Auto Trace Clear

Formatting SQL statement in SQL Developer Syntax formatting Code completion Syntax highlighting Writing multiple statements in the SQL Developer SQL statement history in SQL Developer

SQL*Plus Starting SQL*Plus Executing SQL commands in SQL*Plus Formatting SQL*Plus results