Oracle Academy - SQL Programming Quiz
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Questions and Answers

What are the two components of Oracle Application Express?

  • SQL Workshop and Application Builder (correct)
  • SQL Workshop and Oracle SQL
  • Application Builder and Oracle SQL
  • Data Builder and SQL Workshop

What is the command used to retrieve all the rows in a table?

  • SELECT * (correct)
  • SELECT ROWS
  • SELECT TABLE
  • SELECT ALL

What is the purpose of system software?

System software interacts with the computer hardware.

What is the purpose of application software?

<p>Application software enables users to perform specific tasks.</p> Signup and view all the answers

Oracle Application Express (APEX) accounts are supplied with tables or data.

<p>False (B)</p> Signup and view all the answers

What is the purpose of SQL?

<p>SQL is used to access and manage data in relational databases.</p> Signup and view all the answers

What defines a relational database?

<p>It allows multiple tables to relate through a common field. (A)</p> Signup and view all the answers

Which of the following best describes a primary key in a database?

<p>A field that uniquely identifies a record in a table. (D)</p> Signup and view all the answers

How do foreign keys function in relational databases?

<p>They establish a connection between two different tables. (C)</p> Signup and view all the answers

Why are databases considered important in everyday life?

<p>They streamline tasks such as reservation systems and traffic management. (B)</p> Signup and view all the answers

Which of the following is NOT a key term used in relation to database tables?

<p>Data field (B)</p> Signup and view all the answers

What is the primary keyword used to retrieve data from a database?

<p>SELECT (A)</p> Signup and view all the answers

Which category of SQL statements is responsible for manipulating data within a database?

<p>DML (C)</p> Signup and view all the answers

What type of SQL statement would you use to define a schema in a database?

<p>DDL (A)</p> Signup and view all the answers

Which SQL category encompasses commands that control transactions in a database?

<p>Transaction control language (C)</p> Signup and view all the answers

How many main categories of SQL statements are there?

<p>4 (B)</p> Signup and view all the answers

Which of these is NOT a category of SQL statements?

<p>Response language (D)</p> Signup and view all the answers

What happens after a SQL statement is sent to the Oracle Server?

<p>The request is processed and data is returned (A)</p> Signup and view all the answers

What is the function of the Data Control Language (DCL) in SQL?

<p>To control access permissions (C)</p> Signup and view all the answers

Which primary key is used to uniquely identify each row in a relational database table?

<p>Primary key (C)</p> Signup and view all the answers

What is a foreign key in a relational database?

<p>A column that refers to another table's primary key (C)</p> Signup and view all the answers

How much data is expected to be stored in databases within the next two years?

<p>100 terabytes (A)</p> Signup and view all the answers

Which of the following is NOT a basic component of a relational database table?

<p>Object (B)</p> Signup and view all the answers

Which company has one of the largest databases at 29.2TB?

<p>France Telecom (D)</p> Signup and view all the answers

What percentage of the world's data currently resides in Relational Database Management Systems (RDBMSs)?

<p>20% (B)</p> Signup and view all the answers

What is the term for the basic storage structure in a relational database?

<p>Table (A)</p> Signup and view all the answers

Which measure is equivalent to one terabyte (TB)?

<p>1,000 gigabytes (A)</p> Signup and view all the answers

Which statement accurately describes the use of DML in SQL?

<p>DML is employed to modify table data such as adding or deleting rows. (D)</p> Signup and view all the answers

Which of the following best describes DDL statements?

<p>They create, change, and remove data structures. (C)</p> Signup and view all the answers

What is the main purpose of TCL in SQL?

<p>To execute changes made by DML statements reliably. (A)</p> Signup and view all the answers

Which command is NOT classified as a DCL statement?

<p>DELETE (B)</p> Signup and view all the answers

Which of the following keywords can be used to manage database access?

<p>GRANT (D)</p> Signup and view all the answers

What is the role of a primary key in a relational database?

<p>It uniquely identifies each record in a table. (B)</p> Signup and view all the answers

Which component is NOT considered a category of SQL statements?

<p>Data representation language (DRL) (B)</p> Signup and view all the answers

Which of the following terms refers to modifying table data such as adding new rows?

<p>Data manipulation language (DML) (A)</p> Signup and view all the answers

Which property ensures that each entry in a column of a relational database is unique?

<p>Each row is unique (A)</p> Signup and view all the answers

What is the implication of 'the sequence of columns is insignificant' in a relational database?

<p>The order of columns does not change the meaning of the data (D)</p> Signup and view all the answers

What tool is primarily used to communicate with a relational database in this context?

<p>Oracle Application Express (B)</p> Signup and view all the answers

How is data retrieved from an RDBMS?

<p>By using SQL statements and operators (D)</p> Signup and view all the answers

Which of the following properties of tables ensures uniformity in data types across a column?

<p>Entries in columns are of the same kind (A)</p> Signup and view all the answers

When writing an SQL query, what does the query function like in a real-life scenario?

<p>Calling a friend (C)</p> Signup and view all the answers

What does property 1 of tables refer to?

<p>Entries in columns are single-valued (B)</p> Signup and view all the answers

What is the role of SQL in the context of RDBMS?

<p>To retrieve and manipulate data (A)</p> Signup and view all the answers

Flashcards

Application Software

Software designed for specific tasks, such as word processing, databases, or games.

System Software

Software that manages the computer's hardware and basic functions.

Oracle Application Express (APEX)

A web-based application development platform for building and deploying Oracle database applications.

Syntax

The set of rules that govern how a programming language is written.

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Subset

A smaller, specific part of a larger set of data.

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Comparison Operator

A symbol or expression used to compare values.

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SELECT *

A command that retrieves all rows from a table in a database. It takes the table name as input.

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SELECT Statement with a Condition

A command used to retrieve specific data from a database table based on certain criteria.

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SQL Command

A set of instructions written in a programming language to tell the computer what to do.

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Table

A structured collection of data organized into rows and columns. It's like an electronic spreadsheet.

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Column

A basic unit of data in a table, representing an individual piece of information.

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Row

A horizontal line in a table, representing a collection of data for a specific entity.

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ID

A unique identifier for each row in a table, typically a number.

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Data

A specific piece of information stored about an entity in a table.

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WHERE Clause

A specific condition that determines which rows are included in the results of a SELECT query.

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SQL Workshop

A component in Oracle Application Express that allows users to write and execute SQL commands.

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Application Builder

A component in Oracle Application Express used to design and build web applications.

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Script

A script that creates tables and populates them with data. It's used to set up a database for a specific purpose.

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Command

A set of pre-written instructions that perform a specific task.

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Execute a command

To execute a command means to run it and have it carry out the instructions.

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Error

Incorrectly written code that causes the program to stop running or produce an error.

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Error Message

A message displayed by the computer indicating a problem or a failure in the program.

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Rectify

To fix a problem or error in the code.

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Verify

The act of carefully checking for any mistakes or errors in the code.

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Run/Execute

To use a command or program on a computer.

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Query

To retrieve data from a database using specific criteria.

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String

A specific combination of characters used to represent information. It's like a word or phrase.

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Retrieve information

To access information from a database by using a SELECT statement.

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Select

The process of choosing specific items from a larger set.

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Categorize information

To organize or group related information together. This makes it easier to manage and access.

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Present information

To present information in a specific way, often in a formatted or organized manner.

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What is a relational database?

A relational database is a database that uses tables to store data. These tables can be linked together using shared fields, allowing for efficient data management and relationships.

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What is a common field in a relational database?

A common field is a field that is shared between two or more tables in a relational database. These fields help to link the tables together, creating relationships and allowing for data retrieval from different tables.

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What is a row in a table?

Rows are horizontal lines in a table that represent a single instance of data or entity. Each row contains values for all the columns in that specific table.

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What is a column in a table?

Columns are vertical lines in a table that represent a specific type of data. They represent different attributes about an entity, like name, age, or address.

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What is a primary key?

A primary key is a unique identifier for each row in a table. It ensures that no two rows have the same value for this field, making it easy to identify a specific record in the table.

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Primary Key

A unique identifier for each row in a table, ensuring every entry is distinct.

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Foreign Key

Data in a table that references a primary key in another table, creating relationships between data.

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Relational Database

A type of database that uses tables with relationships, ensuring data integrity and consistency.

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Field

A field containing a value that uniquely identifies an entity within a table.

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Oracle RDBMS

A large database that stores and manages data using Oracle's RDBMS technology.

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Relational Database Management System (RDBMS)

A database organized into rows and columns, allowing data to be accessed without knowing its physical location.

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Single-Valued Entries

Each entry in a table column must hold only one single value.

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Column Data Type

All entries in a table column must be of the same type.

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Unique Rows

Each row in a table must be unique, meaning no two rows can have the same values.

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Insignificant Column Order

The order of columns in a table doesn't affect the information they represent.

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Insignificant Row Order

The order of rows in a table doesn't affect the information they represent.

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Unique Column Names

Each column in a table has a unique name that differentiates it from other columns.

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SQL

A standardized query language used to communicate with databases.

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Data Retrieval Statement

A type of SQL statement used to retrieve data from a database.

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Data Manipulation Language (DML)

A category of SQL statements that perform actions like adding, updating, and deleting data.

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Data Definition Language (DDL)

A category of SQL statements for creating, modifying, and deleting database objects like tables and indexes.

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Transaction Control Language (TCL)

A category of SQL statements designed for managing transactions within a database.

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Data Control Language (DCL)

A category of SQL statements that provide database access control and security features.

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Study Notes

Oracle Academy - Database Programming with SQL

  • This course uses Oracle Application Express (APEX)
  • APEX is a tool to build tables and retrieve data from an Oracle database
  • APEX accounts are supplied without tables or data
  • Scripts are used to add tables and data to the schema
  • To get the script file, go to the Section 0 - Course Resources of the Learner – Learning Path for the course and select the desired script
  • Databases are part of everyday life, even when not explicitly recognized
  • Databases are used for tasks like airline reservations, ATM use, and mobile phone calls
  • Intelligent traffic management systems in cities use databases to control stoplights

Application Programs

  • Application programs allow users like you and me to use ready-to-use programs
  • Applications are different from system software
  • System software consists of low-level programs designed to interact with computer hardware
  • System software examples include operating systems, compilers, and system utilities
  • Applications include programs for word processing, databases, gaming, email, and graphics
  • For example: Yahoo.com uses the Oracle database to store data; users don't need to learn SQL; the application pre-programs the SQL.
  • Significant amounts of data reside in Relational Database Management Systems (RDBMS) – currently 20% of the world’s data
  • Database growth is projected to exceed 100 terabytes in the next few years
  • A database the size of this projection could hold 100,000 copies of the Encyclopedia Britannica, 200,000 hours of music, or 10 billion webpages

Using Applications

  • Applications like cars-hide complexity
  • Applications allow users to use functions without knowing how they work

Oracle Application Express (APEX)

  • APEX enables developers to build and access applications as if they were running in separate databases
  • APEX has built-in features like design themes, navigation controls, form handlers, and flexible reports to accelerate the development process
  • Oracle Application Express (APEX) components include SQL Workshop and Application Builder
  • SQL Workshop is used for SQL learning
  • Application Builder is used for designing applications

Basic SELECT Statement

  • The SELECT * command retrieves all rows in a table
  • The syntax is: SELECT * FROM ;
  • For example: SELECT * FROM employees;

    • SELECT Statement with a Condition

    • Modifying the SELECT statement retrieves a subset of the data
    • Syntax: SELECT <column name 1, column name 2, etc.> FROM
    WHERE ;
  • For example: SELECT first name, last name, job id FROM employees WHERE job_id = 'SA REP';

    • Correcting Errors

    • Correct spelling is essential when entering SQL commands
    • Incorrect spelling results in error messages like ORA-00900: invalid SQL statement
    • Incorrect table or column names also lead to errors like ORA-00942: table or view does not exist or ORA-00904: "NAME": invalid identifier
    • Correct the spelling and run the command again to rectify errors
    • Example errors like "SELCT *" or "FROM employee"

    Terminology

    • Key terms used include: application software, system software, Oracle Application Express, syntax, subset, comparison operator, relational database, row, table, transaction control (TCL), data control language (DCL), data manipulation language (DML), data definition language (DDL), field, foreign key, primary key, RDBMS

    Summary

    • In this lesson, you will learn how to distinguish between application software and system software, give an example of each, log in to the Oracle Application Express practice environment, execute a simple query to retrieve information from the database, and apply SQL rules to display all columns and a subset of columns based on specified criteria.

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    Related Documents

    Oracle Application Express PDF
    Database Programming with SQL PDF

    Description

    Test your knowledge on database programming with SQL using Oracle APEX. This quiz covers various aspects of application programs and their differences from system software. Assess your understanding of how SQL is utilized in real-world applications like Yahoo.com.

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