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WithoutBook LIVE Mock Interviews Data Engineer Related interview subjects: 12

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Know the top Data Engineer interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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Know the top Data Engineer interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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Ques 1

What is a schema in the context of databases?

A schema defines the structure of a database, including tables, fields, and relationships between tables.

Example:

In a relational database, a schema might include tables for 'users' and 'orders,' with defined fields for each.

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Ques 2

What is the difference between a left join and an inner join in SQL?

An inner join returns only the rows where there is a match in both tables, while a left join returns all rows from the left table and the matched rows from the right table.

Example:

Selecting all customers and their orders, even if some customers have not placed any orders (left join).

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