HDFC Bank Application Support Engineer Interview Questions and Answers

SQL is a programming language used for managing and manipulating relational databases.

• SQL stands for Structured Query Language

• It is used to communicate with databases to retrieve, insert, update, and delete data

• Some subtypes of SQL include MySQL, PostgreSQL, Oracle SQL, and Microsoft SQL Server

sed command is a stream editor for filtering and transforming text, while find command is used to search for files in a directory hierarchy.

• sed command is used to perform text transformations on an input stream or file

• find command is used to search for files in a directory hierarchy based on various criteria

• sed command can be used to replace text, delete lines, or perform other text manipulations

• find command can search...read more

PK is Primary Key which uniquely identifies a record in a table, while FK is Foreign Key which establishes a relationship between two tables.

• PK ensures uniqueness of records in a table

• FK establishes a relationship between tables

• PK is used to enforce entity integrity, while FK is used to enforce referential integrity

Shell scraping is the process of extracting data from websites using automated tools or scripts.

• Shell scraping involves writing scripts to automate the process of extracting data from websites

• Tools like BeautifulSoup in Python or Scrapy can be used for shell scraping

• Shell scraping is commonly used for web scraping and data mining purposes

The uptime command in Linux displays the current time, how long the system has been running, and the number of users currently logged in.

• Displays the current time

• Shows how long the system has been running

• Indicates the number of users currently logged in