Dear readers of our blog, we'd like to recommend you to visit the main page of our website, where you can learn about our product SQLS*Plus and its advantages.
 
SQLS*Plus - best SQL Server command line reporting and automation tool! SQLS*Plus is several orders of magnitude better than SQL Server sqlcmd and osql command line tools.
 

REQUEST COMPLIMENTARY SQLS*PLUS LICENCE

Enteros UpBeat offers a patented database performance management SaaS platform. It proactively identifies root causes of complex revenue-impacting database performance issues across a growing number of RDBMS, NoSQL, and deep/machine learning database platforms. We support Oracle, SQL Server, IBM DB2, MongoDB, Casandra, MySQL, Amazon Aurora, and other database systems.

Oracle SUBSTR function

4 August 2020

Oracle SUBSTR function

The Oracle/PLSQL SUBSTR function allows extracting a substring from a string.

Syntax of the Oracle/PLSQL SUBSTR function

SUBSTR( string_id, start_position_id, [ length_id ] ) 

Parameters and function arguments

  • string_id – source line.
  • start_position_id – position to start extraction of substring. The first position in the string is always equal to 1.
  • length_id – is not mandatory. Defines the number of characters to be extracted. If this parameter is not specified, the SUBSTR function will return the entire string.

Note:

  • If start_position is 0, the SUBSTR function will accept start_position as 1 (i.e.: first position in a string).
  • If start_position is a positive number, the SUBSTR function starts reading from the beginning of the line.
  • If start_position is a negative number, the SUBSTR function starts from the end of the line and counts in the opposite direction.
  • If length is a negative number, the SUBSTR function returns NULL.

The SUBSTR function can be used in the following Oracle/PLSQL versions

Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i

 

Let’s consider some examples of SUBSTR function and learn how to use SUBSTR function in Oracle/PLSQL.

SELECT SUBSTR('This is a test', 6, 2) FROM DUAL;

--Result: is

SELECT SUBSTR('This is a test', 6) FROM DUAL;

--Result: is a test

SELECT SUBSTR ("HowZertIzTabakerky", 1, 3) FROM DUAL;

--Result: How

SELECT SUBSTR ("HowZertIzTabakerky", -15, 4) FROM DUAL;

--Result: Zert

SELECT SUBSTR ("HowZertIzTabakerky", -11, 2) FROM DUAL;

--Result: Iz

SELECT SUBSTR ("HowZertIzTabakerky", -9, 9) FROM DUAL;

--Result: Tabakerky

Oracle Tutorial for Substr and Instr functions

 
Tags: , , , , ,

MORE NEWS

 

Preamble​​NoSql is not a replacement for SQL databases but is a valid alternative for many situations where standard SQL is not the best approach for...

Preamble​​MongoDB Conditional operators specify a condition to which the value of the document field shall correspond.Comparison Query Operators $eq...

5 Database management trends impacting database administrationIn the realm of database management systems, moreover half (52%) of your competitors feel...

The data type is defined as the type of data that any column or variable can store in MS SQL Server. What is the data type? When you create any table or...

Preamble​​MS SQL Server is a client-server architecture. MS SQL Server process starts with the client application sending a query.SQL Server accepts,...

First the basics: what is the master/slave?One database server (“master”) responds and can do anything. A lot of other database servers store copies of all...

Preamble​​Atom Hopper (based on Apache Abdera) for those who may not know is an open-source project sponsored by Rackspace. Today we will figure out how to...

Preamble​​MongoDB recently introduced its new aggregation structure. This structure provides a simpler solution for calculating aggregated values rather...

FlexibilityOne of the most advertised features of MongoDB is its flexibility.  Flexibility, however, is a double-edged sword. More flexibility means more...

Preamble​​SQLShell is a cross-platform command-line tool for SQL, similar to psql for PostgreSQL or MySQL command-line tool for MySQL.Why use it?If you...

Preamble​​Writing an application on top of the framework on top of the driver on top of the database is a bit like a game on the phone: you say “insert...

Preamble​​Oracle Coherence is a distributed cache that is functionally comparable with Memcached. In addition to the basic function of the API cache, it...

Preamble​​IBM pureXML, a proprietary XML database built on a relational mechanism (designed for puns) that offers both relational ( SQL / XML ) and...

  What is PostgreSQL array? In PostgreSQL we can define a column as an array of valid data types. The data type can be built-in, custom or enumerated....

Preamble​​If you are a Linux sysadmin or developer, there comes a time when you need to manage an Oracle database that can work in your environment.In this...

Preamble​​Starting with Microsoft SQL Server 2008, by default, the group of local administrators is no longer added to SQL Server administrators during the...