WebApr 22, 2024 · A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. 1: What does GROUP BYdo? The GROUP BY clause in SQL arranges query output into groups, with all the rows with the same value in a given column belonging to one group. For example, if you have a table that stores employee data, you can count employees by department or find the average salary for … See more 5: What functions can be used with GROUP BY? The GROUP BYclause is usually used with SQL’s aggregate functions. These take … See more This has been an overview of the most common SQL interview questions focused on the GROUP BYclause. GROUP BYis an important concept. Without using it like it’s your second … See more
Top 40 SQL Query Interview Questions and Answers for Practice
WebJan 1, 2024 · The GROUP BY clause lets us: Divide our table into smaller tables according to a single column. Perform an aggregate function over each of them. Integrate the … WebThese questions are often asked in interview and should be known by anyone who wants ... In this video, we'll understand some important sql interview questions. chemcorp fog fluid
Top 20 SQL JOINs Interview Questions and Answers (2024)
WebApr 7, 2024 · Generally speaking, the easier, definitional questions will be fewer and less important than the live coding questions—something to keep in mind as you prepare. 1. Define a SQL term. If you’re interviewing for a data analyst role, chances are you know what SQL is (and your interviewer assumes you know this). WebApr 12, 2024 · Write a query to find the top 5 countries with the highest number of active users on a website in the last month. SELECT country, COUNT (DISTINCT user_id) AS num_active_users FROM website_user_activity WHERE activity_date >= DATE_SUB (NOW (), INTERVAL 1 MONTH) GROUP BY country ORDER BY num_active_users … WebFeb 3, 2024 · In this article, we identify six of the top SQL joins interview job questions to know about and how to answer them. Why employers ask about SQL joins. ... Example: “A table is an organized group of data which might include rows or columns. A field is the number of columns in the table. For example, a table might be called employee information. flickr rainand69