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
Redefining Healthcare Efficiency: AI-Driven Backlog Prioritization and Capital Expenditure Optimization with Enteros
- 29 October 2025
- Database Performance Management
Introduction The healthcare industry is under constant pressure to balance two competing priorities — improving patient outcomes and managing operational efficiency within constrained budgets. With digital transformation accelerating across hospitals, clinics, and research institutions, vast amounts of data are being generated from electronic health records (EHRs), diagnostic imaging, clinical workflows, and administrative systems. This influx … Continue reading “Redefining Healthcare Efficiency: AI-Driven Backlog Prioritization and Capital Expenditure Optimization with Enteros”
Maximizing Database Performance with Enteros: AI SQL, AIOps Intelligence, and Cloud FinOps for Smarter Performance Management
Introduction In today’s rapidly evolving digital economy, the performance of databases is the silent force driving innovation, growth, and operational efficiency. As enterprises transition to multi-cloud ecosystems and adopt AI-driven strategies, managing database performance across complex environments has become both an art and a science. Enteros sits at the forefront of this transformation — leveraging … Continue reading “Maximizing Database Performance with Enteros: AI SQL, AIOps Intelligence, and Cloud FinOps for Smarter Performance Management”
✈️ When Flights Stop — and So Does Data: What Alaska Air’s IT Outage Reveals About Operational Resilience
When Alaska Air grounded flights after a failure in its primary data center, it looked like a classic IT outage.But behind the headlines was a more modern truth:operations now depend on data performance as much as on hardware reliability. In aviation, a single database delay can cascade through thousands of dependencies — from ticketing to … Continue reading “✈️ When Flights Stop — and So Does Data: What Alaska Air’s IT Outage Reveals About Operational Resilience”
Boosting eCommerce Growth with Enteros: AI SQL, RevOps Efficiency, and Performance Optimization for the Digital Marketplace
- 28 October 2025
- Database Performance Management
Introduction The eCommerce landscape is evolving at an unprecedented pace. With billions of daily transactions, global supply chain integrations, and an ever-expanding digital customer base, eCommerce enterprises are under increasing pressure to maintain lightning-fast performance, accurate analytics, and cost-efficient operations.In this hyper-competitive environment, Enteros emerges as a transformative solution — combining AI SQL intelligence, RevOps … Continue reading “Boosting eCommerce Growth with Enteros: AI SQL, RevOps Efficiency, and Performance Optimization for the Digital Marketplace”