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...
oracle
English 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...