PostgreSQL-Database/C2/Alias-Names/English

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Title of the Script: Alias Names

Author: EduPyramids

Keywords: PostgreSQL, pgAdmin 4, alias, AS keyword, space, underscore, double quotes, video tutorial, EduPyramids.


Visual Cue Narration
Title Slide 1 Welcome to this Spoken Tutorial on Alias Names in PostgreSQL.
Slide 2

Learning Objectives

In this tutorial, we will learn to,
  • Create alias names using:
  • space,
  • AS keyword,
  • underscore and
  • double quotes.
Slide 3

System Requirements

To record this tutorial, I am using

• Ubuntu 24.04 LTS,

• PostgreSQL version 18.1, and

• pgAdmin 4 version 9.11.

To record this tutorial, I am using the following setup.
Slide 4

Pre-requisites

To follow this tutorial,
  • Learners should have PostgreSQL and pgAdmin 4
  • For the prerequisite PostgreSQL tutorials, please visit this website.
Slide 5

Code Files

The following code file is required to practice this tutorial:

• an-commands.txt

This file is provided in the Code Files link on this tutorial page.

Please download and extract the file.

The following code file is required to practice this tutorial.

This file is provided in the Code Files link of this tutorial page.

Please download and extract the file.

Let us get started.
Point to the interface. I have opened the pgAdmin 4 interface and connected to the localhost server.
Display the students table

Type:

SELECT * FROM students;

Let us display the student table.

Type the following query. Click on the Execute query icon to run the query. Notice the student table with all the records.

Slide 5

What is an Alias?

Let us see what an alias is?

An alias is a temporary name given to a column or a table. It improves the readability of the output. Alias names exist only for the duration of the query.

Type:

SELECT studentname fullname FROM students;

Let us create an alias using a space.

Type the following query.

Highlight studentname fullname Here, studentname is the original column name.

fullname is the alias given using a space.

Click on the execute query button. Click on the Execute query button to execute the query.

The output displays the studentname column with the new heading fullname.

Type:

SELECT city AS studentcity FROM students;

Now let us create an alias using the as keyword.

Type the following query.

Highlight city AS studentcity Here, AS keyword explicitly assigns the alias name studentcity to the city column.
Click the Execute query icon

Point to the output..

Let us execute the query.

Observe the output. The original column name city is now replaced with studentcity.

Type:

SELECT studentid AS student_id FROM students;

Now let us use an underscore in the alias name.

Type the following query.

Highlight student_id Here, student_id is the alias name.

The underscore is used to separate words for better readability.

Click the Execute query icon. Let us execute the query.

The column heading is now changed to student_id.

Highlight: SELECT studentid AS student_id FROM students;

Type:

SELECT studentid student_id FROM students;

Here the AS keyword is optional, it means the query runs with or without AS.

Let us type this query and execute it. Both the queries give the same result.

Type: SELECT cgpa AS "Student cgpa" FROM students; Now let us create an alias using double quotes. Type the following query.
Highlight "student cgpa" Here double quotes allow us to include spaces in the alias name.

Double quotes are required when the alias contains spaces.

Click the Execute query icon. Let us execute the query.

The column heading cpga is now changed to student cgpa.

Type:

SELECT * FROM students;

Alias names are temporary and do not modify the actual table structure.

To check, let us type this query and execute it. Observe that the actual table is not modified.

Slide 7

Summary

In this tutorial we have learnt to,

• Create alias names using:

• space,

• AS keyword,

• underscore and

• double quotes.

With this we come to the end of this tutorial.

Let us summarise.

Slide 8

Assignment

As an assignment,

Create alias names for gender and date of birth columns using different methods of aliasing.


As an assignment, please do the following.
Slide 9

Thank You

This Spoken Tutorial is brought to you by EduPyramids Educational Private Limited, SINE IIT Bombay.

Thank you.

Contributors and Content Editors

ANJALISATDIVE, Madhurig

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