Data Engineer Interview Questions and Answers
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Freshers / Beginner level questions & answers
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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