HCL Infosystems SQL Developer Interview Questions and Answers

Experienced SQL Developer with strong knowledge in database management and optimization.

• Over 5 years of experience in SQL development

• Proficient in writing complex SQL queries and stored procedures

• Skilled in database performance tuning and optimization

• Familiar with ETL processes and data warehousing

• Certified in SQL Server administration

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 perform tasks such as querying data, updating records, and creating tables

• Examples of SQL commands include SELECT, INSERT, UPDATE, DELETE

Join is used to combine rows from two or more tables based on a related column, while Procedure is a set of SQL statements that perform a specific task.

• Join is used to retrieve data from multiple tables based on a related column

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Procedure is a set of SQL statements stored in the database and executed when called

• Procedures can accept input parameters