VAYUZ Technologies Application Developer Interview Questions and Answers

Indexes are data structures used to improve the speed of data retrieval operations in databases.

• Indexes are created on columns in a database table to speed up the retrieval of rows matching a certain condition.

• They work by creating a separate data structure that allows the database to quickly locate rows that match the indexed column values.

• Examples of indexes include primary keys, unique keys, and non-unique indexes o...read more

Joins are used in databases to combine rows from two or more tables based on a related column between them.

• Joins are used to retrieve data from multiple tables based on a related column between them

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• INNER JOIN returns rows when there is at least one match in both tables

• LEFT JOIN returns all rows from the left table and the matched rows from th...read more