English A Guide to Oracle’s CONCAT and SUBSTR Functions
Among the essential string manipulation functions for mastering Oracle Database, CONCAT and SUBSTR are extremely useful....
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English 26ai_en Oracle Database 26ai Free Installation Guide [RHEL8/Oracle Linux 8]
This article explains the installation procedure for "Oracle AI Database Free (26ai)," which allows you to experience th...
26ai_en Oracle AI Database 26ai On-Premises Release Set for Jan 2026! Differences from 19c and New AI Features Explained(Name changed from 23ai)
It has been revealed that the on-premises Enterprise Edition (Linux x86-64) of "Oracle AI Database 26ai," which will be ...
English A Complete Guide to UPPER, LOWER, and INITCAP Functions
String formatting is one of the most fundamental aspects of database operations. This article provides a thorough explan...
English A Guide to Oracle Functions
Oracle Database functions are powerful tools for streamlining operations and making code simpler and more maintainable. ...
English A Guide to “Substitution Variables” in Oracle SQL
"Substitution variables" in Oracle SQL are a powerful feature for executing queries dynamically. This article provides a...
English Mastering the SQL ORDER BY Clause!
When working with databases, displaying query results in an ordered fashion is extremely important for reporting and dat...
English A Comprehensive Guide to the Oracle WHERE Clause!
The WHERE clause is essential when extracting data using SQL. It enables efficient data management by retrieving only th...
English Mastering DISTINCT! How to Eliminate Duplicate Data and Apply It
When manipulating data with SQL, you often encounter situations where you want to "eliminate duplicate data." For exampl...
English Understanding NULL in Oracle Database
In Oracle Database, NULL signifies that a "value is unknown" or in a "state of absence." This is different from "zero" a...
Date and Time Data_en How to Convert Strings to Datetime Data
In Oracle Database, converting strings to datetime data types is a crucial task. For example, converting date strings im...
Date and Time Data_en How to Retrieve Date and Time Data in Oracle
Oracle Database provides powerful features for retrieving the current date and time and manipulating datetime data. This...
English A Guide to Character Literals and the Concatenation Operator
In Oracle Database, "character literals" and the "concatenation operator" are fundamental to string manipulation, allowi...
Oracle Basics_en Explaining the Oracle dual Table!
When working with the Oracle database, the dual table is an entity you will almost certainly encounter. While its name m...
Data Types_en Mastering Oracle Table Creation and Data Types
Creating tables in an Oracle database is fundamental to efficient data management. This article provides a detailed expl...
English Explaining the Basics of the Oracle SELECT Statement
The SELECT statement is the most basic and important SQL statement for operating an Oracle database. It allows you to ex...
English Sample Tables and JOIN Examples for Hands-on Oracle Practice
When learning to operate an Oracle database, creating sample tables and manipulating data is extremely effective. This a...
English A Beginner’s Guide to SQL*Loader
SQL*Loader is an essential tool for efficiently loading large volumes of data into an Oracle database. This article prov...
English Explaining the ORA-1555 Error: Causes, Solutions, and Prevention
If you operate an Oracle database, you may have experienced the headache of the "ORA-1555: snapshot too old" error. This...
English Guide to UNDO Tablespaces and UNDO Segments
To properly operate an Oracle database, understanding the UNDO tablespace and UNDO segments is essential. This article i...