EDUCBA

EDUCBA

MENUMENU
  • Free Tutorials
  • Free Courses
  • Certification Courses
  • 360+ Courses All in One Bundle
  • Login
Home Data Science Data Science Tutorials PostgreSQL Tutorial PostgreSQL Compare Strings
Secondary Sidebar
PostgreSQL Tutorial
  • Basic
    • What is PostgreSQL
    • PostgreSQL Features
    • How to Install PostgreSQL
    • PostgreSQL Versions
    • PostgreSQL Architecture
    • PostgreSQL GUI
    • Postgres Command-Line
    • PostgreSQL Variables
    • PostgreSQL Data Types
    • PostgreSQL NOT NULL
    • PostgreSQL Integer
    • PostgreSQL Boolean
    • PostgreSQL BIGINT
    • PostgreSQL NULLIF
    • PostgreSQL Administration
    • PostgreSQL Commands
    • PostgreSQL Operators
    • PostgreSQL IN Operator
    • Postgres like query
    • PostgreSQL encode
    • PostgreSQL Cheat Sheet
    • PostgreSQL List Databases
    • PostgreSQL Rename Database
  • Control Statement
    • PostgreSQL IF Statement
    • PostgreSQL if else
    • PostgreSQL CASE Statement
    • PostgreSQL LOOP
    • PostgreSQL For Loop
    • PostgreSQL While Loop
  • Joins
    • Joins in PostgreSQL
    • PostgreSQL Inner Join
    • PostgreSQL Outer Join
    • LEFT OUTER JOIN in PostgreSQL
    • PostgreSQL FULL OUTER JOIN
    • PostgreSQL LEFT JOIN
    • PostgreSQL Full Join
    • PostgreSQL Cross Join
    • PostgreSQL NATURAL JOIN
    • PostgreSQL UPDATE JOIN
  • Queries
    • PostgreSQL Queries
    • PostgreSQL INSERT INTO
    • PostgreSQL WHERE Clause
    • PostgreSQL WITH Clause
    • PostgreSQL ORDER BY
    • PostgreSQL ORDER BY Random
    • PostgreSQL ORDER BY DESC
    • PostgreSQL GROUP BY
    • PostgreSQL group_concat
    • PostgreSQL HAVING
    • PostgreSQL Recursive Query
  • Advanced
    • PostgreSQL Schema
    • Postgres List Schemas
    • PostgreSQL Drop Schema
    • PostgreSQL VARCHAR
    • Array in PostgreSQL
    • PostgreSQL DDL
    • PostgreSQL List Users
    • Postgres Default User
    • Postgres add user
    • PostgreSQL User Password
    • PostgreSQL log_statement
    • PostgreSQL repository
    • PostgreSQL shared_buffer
    • PostgreSQL String Functions
    • PostgreSQL Compare Strings
    • PostgreSQL Text Search
    • PostgreSQL TEXT
    • PostgreSQL String Array
    • PostgreSQL where in array
    • PostgreSQL Constraints
    • PostgreSQL UNIQUE Constraint
    • PostgreSQL CHECK Constraint
    • PostgreSQL INTERSECT
    • PostgreSQL Like
    • Cursors in PostgreSQL
    • PostgreSQL UNION ALL
    • Indexes in PostgreSQL
    • PostgreSQL Index Types
    • PostgreSQL REINDEX
    • PostgreSQL UNIQUE Index
    • PostgreSQL Clustered Index
    • PostgreSQL DROP INDEX
    • PostgreSQL DISTINCT
    • PostgreSQL FETCH
    • PostgreSQL RAISE EXCEPTION
    • PostgreSQL Auto Increment
    • Sequence in PostgreSQL
    • Wildcards in PostgreSQL
    • PostgreSQL Subquery
    • PostgreSQL Alias
    • PostgreSQL LIMIT
    • PostgreSQL Limit Offset
    • PostgreSQL LAG()
    • PostgreSQL Table
    • Postgres Show Tables
    • PostgreSQL Describe Table
    • PostgreSQL Lock Table
    • PostgreSQL ALTER TABLE
    • Postgres Rename Table
    • PostgreSQL List Tables
    • PostgreSQL TRUNCATE TABLE
    • PostgreSQL Table Partitioning
    • Postgres DROP Table
    • PostgreSQL Functions
    • PostgreSQL Math Functions
    • PostgreSQL Window Functions
    • Aggregate Functions in PostgreSQL
    • PostgreSQL Primary Key
    • Foreign Key in PostgreSQL
    • PostgreSQL Procedures
    • PostgreSQL Stored Procedures
    • PostgreSQL Views
    • PostgreSQL Materialized Views
    • Postgres Create View
    • PostgreSQL Triggers
    • PostgreSQL DROP TRIGGER
    • PostgreSQL Date Functions
    • PostgreSQL TO_DATE()
    • PostgreSQL datediff
    • PostgreSQL Timestamp
    • PostgreSQL CURRENT_TIMESTAMP()
    • PostgreSQL Notify
    • PostgreSQL LENGTH()
    • PostgreSQL blob
    • PostgreSQL Median
    • PostgreSQL kill query
    • PostgreSQL Formatter
    • PostgreSQL RANK()
    • PostgreSQL Select
    • PostgreSQL Average
    • PostgreSQL DATE_PART()
    • PostgreSQL EXECUTE
    • PostgreSQL COALESCE
    • PostgreSQL EXTRACT()
    • PostgreSQL Sort
    • PostgreSQL TO_CHAR
    • PostgreSQL Interval
    • PostgreSQL Number Types
    • PostgreSQL ROW_NUMBER
    • Alter Column in PostgreSQL
    • PostgreSQL Identity Column
    • PostgreSQL SPLIT_PART()
    • PostgreSQL CONCAT()
    • PostgreSQL replace
    • PostgreSQL TRIM()
    • PostgreSQL MAX
    • PostgreSQL DELETE
    • PostgreSQL Float
    • PostgreSQL OID
    • PostgreSQL log
    • PostgreSQL REGEXP_MATCHES()
    • PostgreSQL MD5 
    • PostgreSQL NOW()
    • PostgreSQL RANDOM
    • PostgreSQL round
    • PostgreSQL Trunc()
    • PostgreSQL TIME
    • PostgreSQL IS NULL
    • PostgreSQL CURRENT_TIME
    • PostgreSQL MOD()
    • Postgresql Count
    • PostgreSQL Datetime
    • PostgreSQL MIN()
    • PostgreSQL age()
    • PostgreSQL enum
    • PostgreSQL OR
    • PostgreSQL Wal
    • PostgreSQL NOT IN
    • PostgreSQL SET
    • PostgreSQL Current Date
    • PostgreSQL Compare Date
    • PostgreSQL SERIAL
    • PostgreSQL UUID
    • PostgreSQL Merge
    • PostgreSQL Database
    • PostgreSQL Clone Database
    • PostgreSQL Copy Database
    • PostgreSQL Show Databases
    • PostgreSQL Restore Database
    • PostgreSQL DROP DATABASE
    • PostgreSQL ALTER DATABASE
    • Postgres DROP Database
    • Postgres Dump Database
    • PostgreSQL OFFSET
    • PostgreSQL GRANT
    • PostgreSQL COMMIT
    • PostgreSQL ROLLUP
    • PostgreSQL JSON
    • EXPLAIN ANALYZE in PostgreSQL
    • PostgreSQL Temporary Table
    • PostgreSQL Show Tables
    • PostgreSQL cluster
    • PostgreSQL Replication
    • PostgreSQL Logical Replication
    • PostgreSQL flush privileges
    • PostgreSQL Tablespaces
    • CAST in PostgreSQL
    • PostgreSQL CTE
    • hstore in PostgreSQL
    • PostgreSQL Encryption
    • PostgreSQL DECODE()
    • PostgreSQL Vacuum
    • PostgreSQL EXCLUDE
    • Postgres Change Password
    • Postgres Delete Cascade
    • PostgreSQL EXCEPT
    • PostgreSQL Roles
    • PostgreSQL Link
    • PostgreSQL Partition
    • PostgreSQL column does not exist
    • PostgreSQL Log Queries
    • PostgreSQL escape single quote
    • PostgreSQL Query Optimization
    • PostgreSQL Character Varying
    • PostgreSQL Transaction
    • PostgreSQL Extensions
    • PostgreSQL Import CSV
    • PostgreSQL Client
    • PostgreSQL caching
    • PostgreSQL Incremental Backup
    • PostgreSQL JSON vs JSONNB
    • PostgreSQL JDBC Driver
    • PostgreSQL Interview Questions

PostgreSQL Compare Strings

By Priya PedamkarPriya Pedamkar

PostgreSQL Compare Strings

Introduction to PostgreSQL Compare Strings

PostgreSQL Compare Strings compare the two string and return the result as we have specified the input, we can also update the rows using comparing strings in PostgreSQL. We can compare the string using like clause in PostgreSQL, we can also compare the string using the =, !=, <>, <, >, <= and >= character string operator. Basically character string operator in PostgreSQL is used to compare the string and return the result as we specified input within the query. Comparison operator in PostgreSQL compares the two string values with each other and retrieves or update the rows.

How to Compare Strings in PostgreSQL?

We have used like and comparison operator for comparing two strings in PostgreSQL. Comparison operator is very useful while comparing two strings. We are using stud_str table to describe example of compare string in PostgreSQL as follows.

Start Your Free Data Science Course

Hadoop, Data Science, Statistics & others

Below is the table and data description of stud_str table.

Code:

select * from stud_str;
\d+ stud_str;

Output:

PostgreSQL Compare Strings 1

Below is the comparison operator which we have used in PostgreSQL while comparing string in PostgreSQL.

  • < (Less than): It will return the true value when left string is less than right string.
  • > (Greater than): It will return the true value when left string is greater than right string.
  • <= (Less than or equal to): It will return the true value when left string is less than equal to right string.
  • >= (Greater than): It will return the true value when left string is greater than equal to right string.
  • <> or != (Not equal): It will return the true value when the given string is not equal to each other.
  • = (Equal): It will return the true value when the two string are same also the type of the string is same.

Examples of PostgreSQL Compare Strings

Given below are the examples mentioned:

Example #1

Compare string using equality operator.

  • We can compare the string using equality operator. Below example shows that we are comparing the string using equality operator and retrieving the result using select operations.
  • In below example we have compared the string ABC with PQR to retrieve result from stud_str table.

Code:

select * from stud_str where first_name = 'ABC' and last_name = 'PQR';

Output:

PostgreSQL Compare Strings 2

  • Below example shows that we are comparing the string and updating the rows using update operations.
  • In below example we have compared the string ABC with PQR to update the rows from stud_str table.

Code:

update stud_str set id = 11 where first_name = 'ABC' and last_name = 'PQR';
select * from stud_str;

Output:

PostgreSQL Compare Strings 3

Example #2

Compare string using greater than operator.

  • We can compare the string using greater than operator. Below example shows that we are comparing the string using greater than operator and retrieving the result using select operations.

Code:

select * from stud_str where first_name > 'ABC' and last_name > 'PQR';

Output:

using greater than operator

  • Below example shows that we are comparing the string using greater than operator and updating the rows using update operations.

Code:

update stud_str set id = 12 where first_name > 'ABC' and last_name > 'PQR';
select * from stud_str;

Output:

using greater than operator and updating the rows using update operations

Example #3

Compare string using like operator.

  • We can compare the string using like operator. Below example shows that we have comparing the string using like operator and retrieving the result using select operations.

Code:

select * from stud_str where first_name like '%BC' and last_name like 'PQ%';

Output:

using like operator

  • Below example shows that we are comparing the string using like operator and updating the rows using update operations.

Code:

update stud_str set id = 101 where first_name like '%BC' and last_name like 'PQ%';
select * from stud_str;

Output:

PostgreSQL Compare Strings 8

Example #4

Compare string using less than operator.

  • We can compare the string using less than operator. Below example shows that we are comparing the string using less than operator and retrieving the result using select operations.

Code:

select * from stud_str where first_name < 'ABC' and last_name < 'PQR';

Output:

using less than operator

Example #5

Compare string using less than equal to operator.

  • We can compare the string using less than equal to operator. Below example shows that we are comparing the string using less than equal to operator and retrieving the result using select operations.

Code:

select * from stud_str where first_name <= 'ABC' and last_name <= 'PQR';

Output:

PostgreSQL Compare Strings 10JPG

  • Below example shows that we are comparing the string using less than equal to operator and updating the rows using update operations.

Code:

update stud_str set id = 105 where first_name <= 'ABC' and last_name <= 'PQR';
select * from stud_str;

Output:

PostgreSQL Compare Strings 11JPG

Example #6

Compare string using greater than equal to operator.

  • We can compare the string using greater than equal to operator. Below example shows that we are comparing the string using greater than equal to operator and retrieving the result using select operations.

Code:

select * from stud_str where first_name >= 'ABC' and last_name >= 'PQR';

Output:

PostgreSQL Compare Strings 12JPG

Conclusion

We have used =, !=, <>, <, >, <= and >= comparison operator to compare the string in PostgreSQL. Also we have used like operator to compare the string. We have compared the string using the select and update operations in PostgreSQL.

Recommended Articles

This is a guide to PostgreSQL Compare Strings. Here we discuss the introduction, how to compare strings in PostgreSQL? and examples respectively. You may also have a look at the following articles to learn more –

  1. PostgreSQL Recursive Query
  2. hstore in PostgreSQL
  3. PostgreSQL DECODE()
  4. PostgreSQL Inner Join
Popular Course in this category
PostgreSQL Course (2 Courses, 1 Project)
  2 Online Courses |  1 Hands-on Project |  7+ Hours |  Verifiable Certificate of Completion
4.5
Price

View Course
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
Free Data Science Course

Hadoop, Data Science, Statistics & others

By continuing above step, you agree to our Terms of Use and Privacy Policy.
*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

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