Unix / Linux – Directory Management
A directory is a file the solo job of which is to store the file names and the related information. All the files, whether ordinary, …
Unix / Linux – File Management
In this chapter, we will discuss in detail about file management in Unix. All data in Unix is organized into files. All files are organized …
Unix/Linux – Getting Started
What is Unix ? The Unix operating system is a set of programs that act as a link between the computer and the user. The …
SQL (Structured Query Language) – Injection
If you take a user input through a webpage and insert it into a SQL database, there is a chance that you have left yourself …
SQL (Structured Query Language) – Handling Duplicates
There may be a situation when you have multiple duplicate records in a table. While fetching such records, it makes more sense to fetch only …
SQL (Structured Query Language) – Using Sequences
A sequence is a set of integers 1, 2, 3, … that are generated in order on demand. Sequences are frequently used in databases because …
SQL (Structured Query Language) – Sub Queries
A Subquery or Inner query or a Nested query is a query within another SQL query and embedded within the WHERE clause. A subquery is …
