Interview Questions and Answers

GROUP BY is used to group rows that have the same values into summary rows, while HAVING is used to filter groups based on a specified condition.

• GROUP BY is used with aggregate functions to group the result-set by one or more columns.

• HAVING is used to filter groups based on a specified condition after the GROUP BY clause.

• HAVING is used with aggregate functions to filter the result-set based on a condition.

• Example: SELECT department, COUNT(*) FROM employees GROUP BY department...read more

Python is popular due to its simplicity, readability, versatility, and strong community support.

• Easy to learn and use, with simple syntax and readability.

• Versatile language used in web development, data analysis, artificial intelligence, etc.

• Strong community support with a large number of libraries and frameworks available.

• Cross-platform compatibility allows code to run on different operating systems.

• Dynamic typing and automatic memory management make it beginner-friendly.

Understanding SQL problems related to joins and window functions

• Ensure you understand the different types of joins (inner, outer, left, right)

• Know how to use window functions like ROW_NUMBER(), RANK(), and PARTITION BY

• Practice writing queries that involve multiple tables and window functions

High level programming languages are designed to be easily understood by humans and are closer to natural language.

• High level languages are more abstract and do not require knowledge of the computer's hardware.

• They are easier to read, write, and maintain compared to low level languages.

• Examples include Python, Java, C++, and Ruby.

Variables are factors that can change or be manipulated in a scientific experiment or study.

• Variables can be independent (manipulated by the researcher) or dependent (affected by the independent variable).

• Control variables are kept constant to ensure they do not affect the outcome of the study.

• Examples of variables include age, gender, temperature, time, and dosage.

Short-term liabilities are debts or obligations that are due within one year.

• Short-term loans

• Accounts payable

• Accrued expenses

• Short-term portion of long-term debt