The DUAL is special one row, one column table present by default in all Oracle databases. We cannot insert, update, delete record in dual table. Dual means dummy. In the dual table only one column is ...

Welcome to this hands-on lab on Working with Multiple Tables in SQL! This repository contains a step-by-step guide on how to write SQL queries that access multiple tables, compose queries using ...

A dual is a system table used by Oracle. In addition to this SQL Syntax issue, you shouldn’t copy this table to your SQL Server, because it’s an Oracle system table.

Fetching data from the database takes a lot time process. eventually when you need to combine multiple tables in order to fetch the data, reducing database calls becomes very meaningful. although in ...