SQL Interview Question 面试的时候发现会问一些SQL的基本问题,在此总结一下。 ProgramInterview/SQL这个网站上的问题还比较全。 1. Join type INNER JOIN: Returns all rows when there is at least one match in BOTH tables LEFT JOIN: Return all rows from the left table, and the matched rows from the...
Eventually, in an outer query, apply aWHEREfilter and aCOUNT()function on the result of the subquery. Solution of SQL Interview Question #3 Solution: SELECT department_name, AVG(salaries.salary) AS avg_salariesFROM employeesJOIN salariesON employees.employee_id = salaries.employee_idGROUP BY dep...
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In SQL interviews, success comes from a combination of mastering core concepts, consistent practice, and a calm, structured approach to solving problems. By understanding key SQL operations, optimizing your queries, and being prepared to tackle complex scenarios, you’ll be able to impress interview...
Data Analyst SQL Interview Questions Image by Author Question #1: Days At Number One (PostgreSQL) “Find the number of days a US track has stayed in the 1st position for both the US and worldwide rankings. Output the track name and the number of days in the 1st position. Order your out...
These questions are often either (1) high-level system design ("How would you build a Twitter clone?") or (2) trivia ("What is hoisting in Javascript?"). Sometimes the trivia is a lead-in for a "real" question e.g., "How quickly can we sort a list of integers? Good, now ...
This repo is a collection of all the Interview Query's SQL interview question. - GitHub - nehanawar025/interview_query_SQL: This repo is a collection of all the Interview Query's SQL interview question.
Candidate Key:-This key does not have any repeated attribute Foreign Key:-This key a column in the table to create a relationship with another table. This particular RDBMS Question explains the importance of keys in the database. Q9. Explain the difference between physical and logical data inde...
Average Post Hiatus (Part 1) Facebook SQL Interview Question QuestionSolutionDiscussionSubmissions Given a table of Facebook posts, for each user who posted at least twice in 2021, write a query to find the number of days between each user’s first post of the year and last post of the ...
Finally, use the MIN() and MAX() functions in the HAVING clause to show winners between 20 and 30 years. Here’s also the code output. 2. Count Student Number in Departments The question from LeetCode asks you the following. “Write an SQL query to report the respective department name...