Preamble
In PostgreSQL there are many different string functions designed for formatting, analyzing, and comparing strings.
These include both SQL92 standard functions and non-standard PostgreSQL extensions (such as Itrim(), rtrim() and substr()).
In PostgreSQL there are many different string functions
In general, everything that is said about the type of text equally applies to the values of character and varchar types.
|
Function
|
Description
|
|
The PostgreSQL btrim function removes all specified characters both at the beginning and at the end of a line.
|
|
|
The char_length function in PostgreSQL returns the length of the specified string.
|
|
|
The character_length function in PostgreSQL returns the length of the specified string.
|
|
|
The function initcap PostgreSQL converts the first letter of each word to upper case, and all other letters are converted to lower case.
|
|
|
The length PostgreSQL function returns the length of the specified string, expressed in the number of characters.
|
|
|
The lower PostgreSQL function converts all characters of a specified string into a lower case.
|
|
|
The PostgreSQL lpad function returns a string added to the left side of the specified string of a certain length.
|
|
|
The ltrim PostgreSQL function removes all specified characters on the left side of the line.
|
|
|
PostgreSQL operator || allows combining 2 or more lines together.
|
|
|
The PostgreSQL position function returns the substring location in a string.
|
|
|
The repeat PostgreSQL function repeats the string as many times as specified.
|
|
|
The replace PostgreSQL function replaces all occurrences of the specified string.
|
|
|
The PostgreSQL rpad function returns a string added to the right side of the specified string of a certain length.
|
|
|
The PostgreSQL rtrim function removes all specified characters on the right side of the line.
|
|
|
The PostgreSQL strpos function returns the substring arrangement in a string.
|
|
|
The substring PostgreSQL function allows extracting substring from a string.
|
|
|
The translate PostgreSQL function replaces a sequence of characters in a string with another set of characters. However, it replaces one character at a time.
For example, it replaces the first character in string_to_replace with the first character in replace_string. Then it will replace the second character in string_to_replace with the second character in replace_string, etc. |
|
|
The trim PostgreSQL function removes all specified characters from the beginning or end of a line.
|
|
|
PostgreSQL function upper ctrreg converts all characters in the specified string into the upper case.
|
Tutorial; String Functions
About Enteros
Enteros offers a patented database performance management SaaS platform. It proactively identifies root causes of complex business-impacting database scalability and performance issues across a growing number of clouds, RDBMS, NoSQL, and machine learning database platforms.
The views expressed on this blog are those of the author and do not necessarily reflect the opinions of Enteros Inc. This blog may contain links to the content of third-party sites. By providing such links, Enteros Inc. does not adopt, guarantee, approve, or endorse the information, views, or products available on such sites.
Are you interested in writing for Enteros’ Blog? Please send us a pitch!
RELATED POSTS
How to Enable Intelligent Cloud FinOps for Financial Services with Enteros Database Analytics
- 14 June 2026
- Database Performance Management
Introduction Financial services organizations are accelerating cloud adoption to support digital banking, mobile applications, payment platforms, risk management systems, customer analytics, and AI-driven financial services. While cloud transformation provides agility, scalability, and innovation opportunities, it also introduces new challenges around cost control, resource optimization, and operational visibility. Today’s financial institutions operate complex environments that include: … Continue reading “How to Enable Intelligent Cloud FinOps for Financial Services with Enteros Database Analytics”
How to Improve Telecom Profitability with Enteros Cost Attribution and Database Intelligence
Introduction Telecommunications providers are operating in one of the most competitive and technology-intensive industries in the world. While demand for connectivity, mobile services, broadband access, and digital experiences continues to grow, profit margins are increasingly challenged by rising infrastructure costs, complex network operations, and expanding customer expectations. Modern telecom organizations must support: 5G networks Cloud-native … Continue reading “How to Improve Telecom Profitability with Enteros Cost Attribution and Database Intelligence”
Driving Enterprise Efficiency Through AI-Based Database Performance Optimization
- 12 June 2026
- Database Performance Management
Introduction In today’s digital-first economy, enterprises depend heavily on data-driven applications to power everything from customer transactions to real-time analytics and AI workloads. As these systems scale, database performance becomes a critical determinant of business success. Even minor inefficiencies—slow queries, resource contention, or poor scaling strategies—can lead to significant revenue loss, degraded user experience, and … Continue reading “Driving Enterprise Efficiency Through AI-Based Database Performance Optimization”
How Predictive Database Monitoring Improves Application Uptime and Business Continuity
In today’s always-on digital economy, application availability is no longer just an IT metric—it is a business imperative. Customers expect seamless digital experiences, employees depend on uninterrupted access to critical systems, and organizations rely on applications to drive revenue, operations, and customer engagement. Whether supporting e-commerce transactions, financial services, healthcare applications, SaaS platforms, or telecommunications … Continue reading “How Predictive Database Monitoring Improves Application Uptime and Business Continuity”