Integration Developer Interview Questions and Answers

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

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';

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

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