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...
DBA
English 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...
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...