Smart Energy Water Senior Product Engineer Interview Questions and Answers

SQL Indexes improve query performance by allowing faster data retrieval

• Indexes are data structures that improve the speed of data retrieval operations on a database table

• They work by creating a sorted list of specific columns in a table, allowing the database to quickly locate the rows that match a query

• Types of indexes include clustered indexes (physically reorders the table) and non-clustered indexes (separate data s...read more

The order of SQL queries is crucial for proper execution and data retrieval.

• Start with SELECT statement to retrieve data from database

• Follow with FROM clause to specify the table(s) to query

• Add WHERE clause to filter the results based on specified conditions

• Include ORDER BY clause to sort the results in a specific order

• Finish with any additional clauses like GROUP BY or JOIN if needed

Windows functions are built-in functions provided by the Windows operating system to perform various tasks.

• Windows functions are used to interact with the operating system, such as creating windows, handling messages, and managing resources.

• Examples of Windows functions include CreateWindow, SendMessage, and LoadLibrary.

• Windows functions are typically called through the Windows API (Application Programming Interface).