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Introduction to Writing SQL Queries

SS Course: 9000544

Course Overview

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SQL is the cornerstone of all relational database operations. In this hands-on course, you learn to exploit the full potential of the SELECT statement to write robust queries using the best query method for your application, test your queries, and avoid common errors and pitfalls. It also teaches alternative solutions to given problems, enabling you to choose the most efficient solution in each situation.

The course describes the ANSI/ISO SQL standard, but also identifies deviations from the standard in the two most widely used database products, Oracle and Microsoft SQL Server.

                                                                  

Scheduled Classes

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What You'll Learn

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This course combines expert lecture, real-world demonstrations and group discussions with machine-based practical labs and exercises.  Working in a hands-on learning environment led by our expert practitioner, you’ll learn to:

  • Maximize the potential of SQL to build powerful, complex and robust SQL queries
  • Query multiple tables with inner joins, outer joins and self joins
  • Construct recursive common table expressions
  • Summarize data using aggregation and grouping
  • Execute analytic functions to calculate ranks
  • Build simple and correlated subqueries
  • Thoroughly test SQL queries to avoid common errors
  • Select the most efficient solution to complex SQL problems

Outline

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Viewing outline for:

Please note that this list of topics is based on our standard course offering, evolved from typical industry uses and trends. We’ll work with you to tune this course and level of coverage to target the skills you need most. Topics, agenda and labs are subject to change, and may adjust during live delivery based on audience needs, participation and skill-level.

Introduction: Quick Tools Review

  • Introduction to SQL and its development environments
  • Using SQL*PLUS
  • Using SQL Developer

Using the SQL SELECT Statement

  • Capabilities of the SELECT statement
  • Arithmetic expressions and NULL values in the SELECT statement
  • Column aliases
  • Use of concatenation operator, literal character strings, alternative quote operator, and the DISTINCT keyword
  • Use of the DESCRIBE command

Restricting and Sorting Data

  • Limiting the Rows
  • Rules of precedence for operators in an expression
  • Substitution Variables
  • Using the DEFINE and VERIFY command

Single-Row Functions

  • Describe the differences between single row and multiple row functions
  • Manipulate strings with character function in the SELECT and WHERE clauses
  • Manipulate numbers with the ROUND, TRUNC and MOD functions
  • Perform arithmetic with date data
  • Manipulate dates with the date functions

Conversion Functions and Expressions

  • Describe implicit and explicit data type conversion
  • Use the TO_CHAR, TO_NUMBER, and TO_DATE conversion functions
  • Nest multiple functions
  • Apply the NVL, NULLIF, and COALESCE functions to data
  • Decode/Case Statements

Using the Group Functions and Aggregated Data

  • Group Functions
  • Creating Groups of Data
  • Having Clause
  • Cube/Rollup Clause

SQL Joins and Join Types

  • Introduction to JOINS
  • Types of Joins
  • Natural join
  • Self-join
  • Non equijoins
  • OUTER join

Using Subqueries

  • Introduction to Subqueries
  • Single Row Subqueries
  • Multiple Row Subqueries

Using the SET Operators

  • Set Operators
  • UNION and UNION ALL operator
  • INTERSECT operator
  • MINUS operator
  • Matching the SELECT statements

Using Data Manipulation Language (DML) statements

  • Data Manipulation Language
  • Database Transactions
  • Insert
  • Update
  • Delete
  • Merge

Using Data Definition Language (DDL)

  • Data Definition Language
  • Create
  • Alter
  • Drop

Data Dictionary Views

  • Introduction to Data Dictionary
  • Describe the Data Dictionary Structure
  • Using the Data Dictionary views
  • Querying the Data Dictionary Views
  • Dynamic Performance Views

Creating Sequences, Synonyms, Indexes

  • Creating sequences
  • Creating synonyms
  • Creating indexes
  • Index Types

Creating Views

  • Creating Views
  • Altering Views
  • Replacing Views

Managing Schema Objects

  • Managing constraints
  • Creating and using temporary tables
  • Creating and using external tables

Retrieving Data Using Subqueries

  • Retrieving Data by Using a Subquery as Source
  • Working with Multiple-Column subqueries
  • Correlated Subqueries
  • Non-Correlated Subqueries
  • Using Subqueries to Manipulate Data
  • Using the Check Option
  • Subqueries in Updates and Deletes
  • In-line Views

Data Control Language (DCL)

  • System privileges
  • Creating a role
  • Object privileges
  • Revoking object privileges

Manipulating Data

  • Overview of the Explicit Default Feature
  • Using multitable INSERTs
  • Using the MERGE statement
  • Tracking Changes in Data

Prerequisites

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 In order to benefit from the hands-on labs, attendees should have prior experience in scripting or programming languages.

    Who Should Attend

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    This is an introductory- level course appropriate for those who are developing applications using relational databases, or who are using SQL to extract and analyze data from databases and need to use the full power of SQL queries.

    Next Step Courses

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    We offer courses that serve as an excellent follow on to this course, with one option listed below. Our team can work with you to help you select the best next steps based on your role or learning goals.

    • Advanced SQL Programming

    Explore Advanced Querying Techniques, Manipulating Table Data with DML, Stored Procedures, Triggers & More