Travelex Senior Software Engineer Interview Questions and Answers

Improving SQL performance involves optimizing queries, indexes, and server resources.

• Optimize queries by reducing complexity and avoiding unnecessary joins

• Use indexes to speed up data retrieval

• Ensure server resources are adequate for the workload

• Consider partitioning large tables to improve query performance

• Use stored procedures to reduce network traffic and improve security

Index, trigger, and stored procedure are database objects used to improve performance and automate tasks.

• An index is a data structure that improves the speed of data retrieval operations on a database table.

• A trigger is a set of instructions that automatically executes in response to certain events, such as an insert, update, or delete operation on a table.

• A stored procedure is a precompiled set of SQL statements that ...read more

Relationship in SQL refers to the association between two or more tables based on common fields.

• Relationships are established using foreign keys

• Types of relationships include one-to-one, one-to-many, and many-to-many

• Relationships can be visualized using ER diagrams

• Joins are used to retrieve data from related tables

Class module is a custom object in VBA that allows you to define your own properties and methods.

• Class modules are used to create custom objects in VBA

• They allow you to define your own properties and methods

• You can create instances of a class module and use them in your code

• Class modules are useful for encapsulating complex logic and data

• They can be used to create reusable code libraries

Objects in MS Access are used to represent tables, forms, reports, and other database objects.

• Objects are used to organize and manage data in MS Access.

• Tables are the most basic object and store data in rows and columns.

• Forms are used to display and edit data in a user-friendly way.

• Reports are used to present data in a formatted and organized way.

• Queries are used to retrieve and manipulate data from tables.

• Modules are ...read more

Design view is used to create and modify database objects, while Datasheet view is used to view and edit data in tables.

• Design view allows users to create and modify tables, queries, forms, reports, and macros.

• Datasheet view displays data in a spreadsheet-like format and allows users to edit data directly.

• Design view is used to set properties and define relationships between tables.

• Datasheet view is used to sort, filte...read more

Joins are used to combine data from two or more tables in SQL. There are different types of joins.

• Inner join returns only the matching rows from both tables

• Left join returns all the rows from the left table and matching rows from the right table

• Right join returns all the rows from the right table and matching rows from the left table

• Full outer join returns all the rows from both tables

• Cross join returns the Cartesian p

REST API methods are used to interact with web services using HTTP requests.

• GET method is used to retrieve data from the server

• POST method is used to create new data on the server

• PUT method is used to update existing data on the server

• DELETE method is used to delete data from the server

• REST APIs use HTTP status codes to indicate the success or failure of a request