EDUCBA

EDUCBA

MENUMENU
  • Free Tutorials
  • Free Courses
  • Certification Courses
  • 360+ Courses All in One Bundle
  • Login
Home Data Science Data Science Tutorials SQL Tutorial SQL Aliases
Secondary Sidebar
SQL Tutorial
  • Advanced
    • MDF File in SQL Server
    • SQL Aliases
    • SQL Hosting
    • SQL Auto Increment
    • SQL Injection
    • SQL Wildcards
    • SQL Check
    • SQL Indexes
    • Select Distinct
    • SQL BETWEEN
    • SQLPlus spool
    • SQL Create Table
    • SQL Schema
    • Comparison Operators in SQL
    • SQL_plus
    • SQL Formatter
    • SQL LEFT INNER JOIN
    • SQL Plus Command
    • SQLPlus not found
    • SQL Injection Attack
    • Aggregate Functions in SQL
    • SQL REVOKE
    • SQL Select Distinct Count
    • IF ELSE Statement in SQL
    • SQL CASE Statement
    • SQL While Loop
    • SQL BIGINT
    • SQL Crosstab
    • SQL Wildcard Character
    • SQL INSTR()
    • SQL now
    • SQL synonyms
    • SQLite?export to csv
    • What is Procedure in SQL
    • Stored Procedure in SQL?
    • SQL Server Constraints
    • SQL DELETE ROW
    • Column in SQL
    • Table in SQL
    • SQL Virtual Table
    • SQL Merge Two Tables
    • SQL Table Partitioning
    • SQL Temporary Table
    • SQL Clone Table
    • SQL Rename Table
    • SQL LOCK TABLE
    • SQL Clear Table
    • SQL DESCRIBE TABLE
    • SQL Mapping
    • Cursors in SQL
    • AND in SQL
    • Wildcard in SQL
    • SQL FETCH NEXT
    • SQL Views
    • SQL Delete View
    • Triggers in SQL
    • SQL UPDATE Trigger
    • SQL AFTER UPDATE Trigger
    • SQL Update Statement
    • SQL DROP TRIGGER
    • SQL DROP Table
    • Types of SQL Views
    • SQL Port
    • SQL Clustered Index
    • SQL COMMIT
    • Distinct Keyword in SQL
    • PARTITION BY in SQL
    • SQL Set Operators
    • SQL UNION ALL
    • Metadata in SQL
    • SQL Bulk Insert
    • Array in SQL
    • SQL REGEXP
    • JSON in SQL
    • SQL For loop
    • EXPLAIN in SQL
    • ROLLUP in SQL
    • Escape Character SQL
    • SQL Cluster
    • SQL Backup
    • SQL Pattern Matching
    • SQL Users
    • ISNULL SQL Server
    • SQL pivot
    • SQL Import CSV
    • SQL if then else
    • SQL ignore-case
    • SQL Matches
    • SQL Search String
    • SQL Column Alias
    • SQL extensions
    • SQL Substring Function
    • Charindex SQL
  • Basic
    • What is SQL
    • Careers in SQL
    • Careers in SQL Server
    • IS SQL Microsoft?
    • SQL Management Tools
    • What is SQL Developer
    • Uses of SQL
    • How to Install SQL Server
    • What is SQL Server
    • SQL Quick References
    • SQL Like Wildcard
    • SQL Like with Multiple Values
    • SQL Examples
    • SQL Server Versions
    • SQL DROP DB
    • SQL Case Insensitive
    • SQL Expressions
    • Database in SQL
    • SQL Data Types
    • SQL Keywords
    • Composite Key in SQL
    • SQL WAITFOR
    • SQL Constraints
    • Transactions in SQL
    • First Normal Form
    • SQL Server Data Types
    • SQL Administration
    • SQL Variables
    • SQL Enum
    • SQL GROUP BY WHERE
    • SQL ROW
    • SQL EXECUTE
    • SQL EXCLUDE
    • SQL Performance Tuning
    • SQL UUID
    • Begin SQL
    • SQL Update Join
    • SQL Between Dates
    • Cheat sheet SQL
  • Operators
    • SQL Operators
    • SQL Arithmetic Operators
    • SQL Logical Operators
    • SQL String Operators
    • Ternary Operator in SQL
  • Commands
    • SQL Commands
    • sqlplus set commands
    • SQL Alter Command
    • SQL Commands Update
    • SQL DML Commands
    • SQL DDL Commands
    • FETCH in SQL
  • Clause
    • SQL Clauses
    • SQL IN Operator
    • SQL SELECT DISTINCT Multiple Columns
    • SQL Null Values
    • SQL LIKE
    • SQL LIKE Query
    • SQL LIKE Operator
    • SQL LIKE Clause
    • SQL NOT Operator
    • SQL Minus
    • SQL WHERE Clause
    • SQL with Clause
    • SQL HAVING Clause
    • SQL HAVING Clause
    • SQL GROUP BY DAY
    • ORDER BY Clause in SQL
    • SQL ORDER BY CASE
    • SQL ORDER BY DESC
    • SQL ORDER BY DATE
    • SQL ORDER BY Alphabetical
    • SQL ORDER BY Ascending
    • SQL Order by Count
    • SQL GROUP BY Month
    • SQL GROUP BY Multiple Columns
    • SQL GROUPING SETS
  • Queries
    • SQL Insert Query
    • SQL SELECT Query
    • SQL SELECT RANDOM
    • SQL Except Select
    • SQL Subquery
    • SQL SELECT DISTINCT
    • SQL WITH AS Statement
  • Keys
    • SQL Keys
    • SQL Foreign Key
    • Primary Key in SQL
    • Foreign Key in SQL
    • Unique Key in SQL
    • SQL UNIQUE Constraint
    • SQL Primary Key
    • Alternate Key in SQL
    • SQL Super Key
  • Functions
    • SQL Date Function
    • SQL Server Functions
    • SQL String Functions
    • SQL Compare String
    • Timestamp to Date in SQL
    • SQL REGEX
    • SQL Window Functions
    • SQL Syntax
    • SQL CONCAT
    • SQL ALTER TABLE
    • SQL MOD()
    • SQL Timestamp
    • SQL Min and Max
    • SQL TO_DATE()
    • SQL DATEADD()
    • SQL DATEDIFF()
    • SQL HOUR()
    • SQLite? functions
    • ANY in SQL
    • LIKE Query in SQL
    • SQL NOT NULL
    • SQL NOT IN
    • SQL MAX()
    • SQL MIN()
    • SQL SUM()
    • SQL COUNT
    • SQL identity
    • SQL DELETE Trigger
    • SQL Declare Variable
    • SQL Text Search
    • SQL COUNT DISTINCT
    • SQL TEXT
    • SQL Limit Order By
    • BETWEEN in SQL
    • LTRIM() in SQL
    • TOP in SQL
    • SQL Select Top
    • Merge SQL
    • SQL TRUNCATE()
    • SQL UNION
    • SQL ALL
    • SQL INTERSECT
    • SQL Alias
    • SQL Server Substring
    • CUBE in SQL
    • SQL RANK()
    • SQL CTE
    • SQL LAG()
    • SQL MID
    • SQL avg()
    • SQL WEEK
    • SQL DELETE
    • SQL DATEPART()
    • SQL DECODE()
    • SQL DENSE_RANK()
    • SQL NTILE()
    • SQL NULLIF()
    • SQL Stuff
    • SQL Ceiling
    • SQL EXISTS
    • SQL LEAD()
    • SQL COALESCE
    • SQL BLOB
    • SQL ROW_NUMBER
    • SQL Server Replace
    • SQL Ranking Function
    • SQL Server Permission
  • T-SQL
    • T-SQL pivot
    • T-SQL Formatter
    • T-SQL TRY CATCH
    • T-SQL CTE
    • T-SQL CASE
    • T-SQL DATEPART
    • T-SQL Date Format
    • T-SQL ROUND
    • T-SQL Loop
    • T-SQL IIF
    • T-SQL Union
    • T-SQL CREATE TABLE
    • T-SQL INSERT
    • T-SQL Stuff
    • T-SQL ISNULL
    • T-SQL ADD Column
    • T-SQL DATEDIFF
  • Joins
    • Join Query in SQL
    • Types of Joins in SQL
    • Types of Joins in SQL Server
    • SQL Inner Join
    • SQL Join Two Tables
    • SQL Delete Join
    • SQL Left Join
    • LEFT OUTER JOIN in SQL
    • SQL Right Join
    • SQL Cross Join
    • SQL Outer Join
    • SQL Full Join
    • SQL Self Join
    • Natural Join SQL
    • SQL Multiple Join
  • SqlAlchemy
    • What is SQLAlchemy
    • SqlAlchemy ORM
    • SQLAlchemy count
    • SQLAlchemy update object
    • SQLAlchemy pip
    • SQLAlchemy Connection
    • SQLAlchemy Transaction
    • SQLAlchemy Metadata
    • SQLAlchemy Raw SQL
    • SQLAlchemy Filter in List
    • SQLAlchemy Alias
    • SQLAlchemy unique
    • SQLAlchemy JSONB
    • SQLAlchemy Async
    • SQLAlchemy Types
    • SQLAlchemy Many to Many
    • SQLAlchemy Example
    • SQLAlchemy Model
    • SQLAlchemy Data Types
    • SQLAlchemy Filter
    • SQLAlchemy SQLite
    • SQLAlchemy DateTime
    • SQLAlchemy create_engine
    • SQLAlchemy Delete
    • SQLAlchemy Migrations
  • NoSQL
    • NoSQL Databases List
    • NoSQL Data Modeling
    • Types of NoSQL Databases
    • NoSQL Injection
    • NoSQL vs SQL Databases
    • NoSQL Use Cases
    • NoSQL Key Value
  • Interview Questions
    • SQL Interview Questions
    • Advance SQL Interview Questions
    • SQL Joins Interview Questions
    • SQL Server Interview Questions
    • SQL Current Month

SQL Aliases

Introduction to SQL Aliases

Aliasing temporarily renames a table or column by assigning it a new name. Table aliases are employed to rename a table in a particular SQL statement. The databases don’t alter the table’s name; the renaming is only a temporary change. For the sake of a specific SQL query, the fields of a table are renamed using column aliases.

SQL Aliases

Key Takeaways

  • An alias is a different name for a specific item, such as a table, view, sequence, or another alias. Anywhere an object may be directly referred to, it can be used to refer to that object.
  • Using an alias does not require permission.
  • Aliases are helpful when the table’s name is too long or irrelevant.

What are SQL Aliases?

A table or a field within a table can have a temporary name by using SQL aliases. Aliases were frequently used to improve the readability of column names. Column and table aliases are the two types of aliases that SQL provides. Column alias enhances the significance of query results. Table aliases make it easier to avoid using the complete table name, which speeds up the execution of queries. Additionally, the table alias prevents ambiguous table name errors when a table is referenced more than once in a query, such as in an inner join, left join, or subquery.

Start Your Free Data Science Course

Hadoop, Data Science, Statistics & others

How to Use SQL Aliases?

The query statement in which the alias is used is the only restriction on its availability. Names may grow lengthy and complex as requests become more specific. We can use aliases to give the query’s objects new names to make things more understandable.

SQL Aliases Column and Tables

Column aliases and table aliases are the two types of aliases that MySQL provides.

1. Column Alias in MySQL

Often, column names are so complex that it’s hard to interpret the results of the request. One can use a column alias to give a column a meaningful name. The AS keyword is used in conjunction with the alias to assign an alias to a column.

The following syntax demonstrates the use of the column alias:

Aliases

The tables used in the SQL query can be renamed using an alias.

Table aliases are written as follows:

Code:

SELECT
  col_1,
  col_2,
  …
FROM table_name AS alias_name;

In MySQL, we can use the column alias in the ORDER BY, GROUP BY, and HAVING clauses to refer to the column.

Let’s examine how alias functions: The Table creation and value insertion are given below.

Code:

SELECT
 LastName,
PID
FROM Patients AS p
WHERE p.PID <=18;

The following information is returned once this query has been executed:

Table creation and value insertion

The table alias must be used in place of the actual table name if the table name appears in the WHERE clause before a column name. Additionally, one needs to use the alias while specifying the table in the SELECT list (e.g., c.lname). Yet again, the AS keyword is not required. Without that, the request will function as intended.

Alias Column Name:

Code:

SELECT column_name AS alias_name
FROM table_name;

Now, for example, let’s create a Table of Patients as below and also insert some records for manipulation.

Code:

CREATE TABLE Patients (
  PID int,
  LastName varchar(25),
  FirstName varchar(25),
  Address varchar(20),
  City varchar(15)
);
INSERT INTO Patients (PID, LastName, FirstName,Address,city)
VALUES (12,'Cavin', 'Tom B. Erichsen', 'Sweden 21','Norway');
INSERT INTO Patients (PID, LastName, FirstName,Address,city)
VALUES (18,'Anu', 'vishn', '34 usa', 'canada');

Output:

Table of Patients

Example:

Code:

SELECT
  PID AS id,
  LastName AS lname,
  FirstName
FROM Patients
WHERE FirstName ="vishn";

Output:

SQL Aliases 3

2. Table Alias

Table aliases are typically used to retrieve data from multiple tables and link them together using field relations.

  • To display the entire record or specific columns from a table, utilize table aliases in SELECT lists and the FROM clause.
  • WHERE, GROUP BY, HAVING, and ORDER BY clauses all support the use of table aliases.
  • When many tables are needed for data, those tables must be joined by qualifying the columns with the table name or table alias.

SQL Aliases Syntax:

SELECT
  a1.col_name (AS) new_col_name,
  a2.col_name (AS) other_new_col_name,
  ...
FROM table1 (AS) a1
JOIN table2 (AS) a2
  ON a1.col_name = a2.col_name

The table or column name refers to the column’s name in the table to which the alternative name must be assigned.

Let’s take an employee1 table and use the JOIN Statement:

Code:

SELECT emp.id, custr.id, emp_name, emp_department
FROM employee1
INNER JOIN customerdemo
ON emp.id = customerdemo.emp_id

Output:

employee1 table

Frequently Asked Questions

Other FAQs are mentioned below:

Q1. What is SQL is an Alias?

Answer:

An alias is a temporary access name for a database, column, or query result. We construct a temporary alias that lasts for the query execution. The alias is automatically gone once the query has finished running.

Q2. Why is an alias needed in SQL?

Answer:

  • To improve the readability of the query result.
  • To improve the user’s comprehension by identifying appropriate names.

Q3. What are some of the most common uses for an alias?

Answer:

  • Using an alias makes the result simple to interpret when searching multiple tables.
  • Using an alias improves the output’s readability when our query involves complicated functions.
  •  If the column names are still not readable, it helps to make them so.
Note: Using an alias can make your query easier to comprehend and more concise. By default, the output of aggregate functions is displayed in a column with no name. Using an alias is a fantastic method to give the output of your aggregate functions some context.

Conclusion

This article has shown the importance of SQL alias, and when to use SQL in a query has been thoroughly covered. We know every scenario and combination used when utilizing an alias in SQL. Furthermore, we could interpret the fundamental idea of column aliases by using a variety of sample queries on our demo database.

Recommended Articles

This is a guide to SQL Aliases. Here we discuss the introduction and how to use SQL aliases. Column & tables and FAQ, respectively. You may also have a look at the following articles to learn more –

  1. SQL BETWEEN
  2. SQL Wildcards
  3. SQL Schema
  4. sql_plus
Popular Course in this category
JDBC Training (6 Courses, 7+ Projects)
  6 Online Courses |  7 Hands-on Projects |  37+ Hours |  Verifiable Certificate of Completion
4.5
Price

View Course

Related Courses

PHP Training (5 Courses, 3 Project)4.9
Windows 10 Training (4 Courses, 4+ Projects)4.8
SQL Training Program (10 Courses, 8+ Projects)4.7
PL SQL Training (4 Courses, 2+ Projects)4.7
Oracle Training (17 Courses, 8+ Projects)4.7
Primary Sidebar
Footer
About Us
  • Blog
  • Who is EDUCBA?
  • Sign Up
  • Live Classes
  • Corporate Training
  • Certificate from Top Institutions
  • Contact Us
  • Verifiable Certificate
  • Reviews
  • Terms and Conditions
  • Privacy Policy
  •  
Apps
  • iPhone & iPad
  • Android
Resources
  • Free Courses
  • Database Management
  • Machine Learning
  • All Tutorials
Certification Courses
  • All Courses
  • Data Science Course - All in One Bundle
  • Machine Learning Course
  • Hadoop Certification Training
  • Cloud Computing Training Course
  • R Programming Course
  • AWS Training Course
  • SAS Training Course

ISO 10004:2018 & ISO 9001:2015 Certified

© 2023 - EDUCBA. ALL RIGHTS RESERVED. THE CERTIFICATION NAMES ARE THE TRADEMARKS OF THEIR RESPECTIVE OWNERS.

EDUCBA

*Please provide your correct email id. Login details for this Free course will be emailed to you

Let’s Get Started

By signing up, you agree to our Terms of Use and Privacy Policy.

EDUCBA

*Please provide your correct email id. Login details for this Free course will be emailed to you
EDUCBA

*Please provide your correct email id. Login details for this Free course will be emailed to you
EDUCBA Login

Forgot Password?

By signing up, you agree to our Terms of Use and Privacy Policy.

This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy

Loading . . .
Quiz
Question:

Answer:

Quiz Result
Total QuestionsCorrect AnswersWrong AnswersPercentage

Explore 1000+ varieties of Mock tests View more