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Integration Developer Interview Questions and Answers

Updated 28 Jul 2024

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Q1. CTE - When to use & its disadvantages

Ans.

CTE is used to simplify complex queries. Disadvantages include increased memory usage and potential for performance issues.

  • CTE stands for Common Table Expression

  • Use CTE when a query requires multiple subqueries or joins

  • CTE can improve query readability and simplify complex queries

  • Disadvantages include increased memory usage and potential for performance issues

  • CTE is not supported in all database systems

Q2. Tell me about where clause in sql?

Ans.

WHERE clause in SQL is used to filter records based on a specified condition.

  • WHERE clause is used in SELECT, UPDATE, and DELETE statements.

  • It follows the FROM clause in a SQL statement.

  • It can contain multiple conditions using logical operators like AND, OR.

  • Example: SELECT * FROM employees WHERE department = 'IT';

Q3. What is psql? Full form?

Ans.

psql is a command-line interface for PostgreSQL database management.

  • psql stands for 'PostgreSQL', the popular open-source relational database management system.

  • It is a command-line tool that allows users to interact with PostgreSQL databases.

  • psql can be used to execute SQL queries, manage database objects, and perform administrative tasks.

  • Example: psql -U username -d database_name

Q4. Why we use sql?

Ans.

SQL is used to manage and manipulate relational databases efficiently.

  • SQL allows for easy retrieval and manipulation of data stored in relational databases.

  • It provides a standardized way to interact with databases, making it easier for developers to work with data.

  • SQL can be used to perform complex queries, updates, and data manipulation operations.

  • It helps ensure data integrity and consistency in databases.

  • SQL is widely used in various industries for managing and analyzing d...read more

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Q5. What is Java script

Ans.

JavaScript is a high-level, interpreted programming language used for creating interactive websites and web applications.

  • JavaScript is commonly used for client-side web development.

  • It can also be used for server-side development with Node.js.

  • JavaScript allows for dynamic content, interactive elements, and user-friendly interfaces.

  • Examples include form validation, animations, and AJAX requests.

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