Longest continuous streak in sql. You must write an algorithm that runs in O (n) time.

Longest continuous streak in sql The solution required working with event log data, using SQL to calculate streak lengths by analyzing consecutive daily user visits. Which team has the longest active bowl streak in college football? Jul 10, 2023 · Daily Think SQL: Lead and Lag for “Consecutive” Problems A collection of compelling data analysis scenarios that I find essential Why Think SQL Series? When creating SQL queries, I realized that … Sep 28, 2025 · Sixteen years is long for a professional baseball career, and it'd take more than that to knock Ripken from the top of the list. Winning streaks capture our imagination because they demonstrate not just skill but mental fortitude, adaptability, and consistency. Sep 10, 2024 · Determine each user's longest consecutive streak of days watching TV shows on Netflix in January 2023. Feb 1, 2024 · Problem Statement This problem is a variation of the famous Gaps and Islands problem, and the idea behind solving it will be really helpful in your SQL interviews. Your task: For each Nov 26, 2023 · I want to calculate each player's longest winning streak. 9%) 12 contests attended Sep 28, 2025 · Sixteen years is long for a professional baseball career, and it'd take more than that to knock Ripken from the top of the list. This uses MIN & MAX with the FIRST & LAST functions to find the length of the longest streak, when this started, and the length of the current streak for each user Given a table with event logs, find the top five users with the longest continuous streak of visiting the platform. A challenging SQL problem focused on consistency and performance analysis. The consecutive numbers can be in any order. I'll be happy to help How to calculate longest streak in SQL?I have TABLE EMPLOYEE - ID,DATE,IsPresent I want to calculate longest streak for a Jun 14, 2018 · 1 I present my solution for T-SQL. Some of the dates are consecutive (have one day difference) and Jan 4, 2024 · My goal I'm trying to track and display a user's daily streak posting to my app, but struggling to write a query that works reliably and returns an accurate count. The timestamps in your displayed result don't agree with your fiddle (no matter the time zone). This may help you Nov 26, 2023 · I want to calculate each player's longest winning streak. Nov 12, 2015 · To keep track of longest streak and when it occurred. Now I'm interested in finding the longest winning streak for each team. Apr 10, 2016 · Determine longest "streak" in SQL Server? Asked 8 years, 11 months ago Modified 8 years, 11 months ago Viewed 318 times We would like to show you a description here but the site won’t allow us. The code is merely a snippet (as solved on LeetCode) & hence is not executable in a c++ compiler. 0 and trying to get the longest sequence of continuous rows for a specific column and value. This is the best place to expand your knowledge and get prepared for your next interview. Example May 4, 2015 · Problem One popular question I receive from either gamers or traders is how to measure a behavioral streak with SQL Server? In some cases, these clients may not be tracking their measurements in a compatible manner, so this will also address the question, how do I measure the overall change from one day to the next, then measure the streak. Can you solve this real interview question? Longest Winning Streak - Level up your coding skills and quickly land a job. Aug 20, 2020 · Here's another fun query i found to train SQL for product interviews. Nov 10, 2015 · Select longest continuous sequence BTW, it never makes sense to repeat columns in the ORDER BY clause of a window function that are used in the PARTITION clause (Pais and Representante in your original query). Interview question for Data Scientist. Truman serving as presidents In this video we have made a review of how many races in a row a F1 driver has completed without a podium (their longest continuous streak without a top 3 finish). Mar 30, 2023 · Project-GC is a site with the goal to provide statistics and tools for all the geocachers in the world. The goal is to provide insights into student behavior patterns and identify trends that could help in improving educational outcomes. Jul 24, 2013 · So, from the above data, team1 has lost its first match, then won a match, then lost 2 matches, then won 4 consecutive matches and so on. Some context My app has a prompt How to calculate longest streak in SQL?I have TABLE EMPLOYEE - ID,DATE,IsPresent I want to calculate longest streak for a Jun 14, 2018 · 1 I present my solution for T-SQL. Table columns needed: current_streak int longest_streak int longest_streak_end_date datetime Pseudocode: if user has logged in today already return if user logged in yesterday add to current_streak if current_streak > longest_streak set longest_streak = current_streak set longest_streak_end_date = today else set current_streak = Learn how to efficiently find the longest streaks of consecutive log-ins for users in your database using SQL, including step-by-step explanations and sample In these video, I am going to solve a very interesting and tricky sql problem. This video will teach you how to write SQL queries to identify users with consecutive logins!We'll break down the concept into easy-to-follow steps: 📌 Un By leveraging SQL prowess, we navigate through the entries to pinpoint the longest streak, providing insights into a user's dedicated fitness journey. Discover how to efficiently calculate each player's `longest winning streak` in SQL with a clear and comprehensive guide. You haven't specific a RDBMS so the date functions may need amending as appropriate, however all RDBMS support the same functionality. The below Given an array of n integers, find the length of the longest consecutive sequence. You must write an algorithm that runs in O (n) time. The SL (StreakLength) CTE get the streak length for every winning streak and create a position ranking by length. Say I have a table with DATE and IS_PRESENT flag column with values as Y and N. Dec 22, 2024 · Write a query to calculate the streak of consecutive days each employee has been present, where a streak is defined as a series of consecutive days with “present” status. On SQuizL we display your longest and current series of successful guesses. If the users log in on consecutive dates, the differences would remain the same, indicating a streak. A "streak" is the number of consecutive days that the event has occurred at least once. ''' WITH cte AS ( SELECT player_id, result, match_day, ROW_NUMBER () OVER (PARTITION BY player_id ORDER BY match_day) AS rnk FROM Aug 3, 2020 · find users with consecutive logins sql query Asked 5 years, 3 months ago Modified 5 years, 3 months ago Viewed 4k times The repository contains solutions to various problems on leetcode. Nov 14, 2024 · To calculate the longest continuous streak of scores of 100 for each employee using a DAX measure, we can create a formula that counts consecutive rows with a Total_Score of 100 until the streak breaks. In Duolingo for example you can keep a streak of continuous days of learning. . Today Day 12 of 15 Days Prepvector SQL Challenge Here is the problem statement, and it's a hard problem: User Consecutive Day Streak Analysis: Given a table with event logs, find the top five C3. To calculate such streaks, you could use a loop and a days counter to iterate over the streak relevant elements. Project Outline Project Introduction Objective: To analyze student May 22, 2025 · The pursuit of victory drives every athlete and team, but sustaining excellence over an extended period represents a rare achievement in sports. The problem is find the longest winning streak for all the teams. Please help me realize this using a SQL query for Oracle database. Nov 24, 2024 · While winning a national or conference title might be the ultimate college football goal at the start of every season, hitting the magic six wins and becoming bowl eligible is a legitimate marker for all 134 FBS programs. Now I need to find the maximum number of consecutive working days that the present flag was Y. The solution: Packing overlapping date ranges requires 3 steps: Step 1: determine a GroupStart select Asset_Id, Trailer_Id, AssignStart, AssignEnd , case when max How to calculate longest streak in SQL?I have TABLE EMPLOYEE - ID,DATE,IsPresent I want to calculate longest streak for a May 19, 2020 · Interview question for Data Scientist. This video series aims to provide 3 Jun 7, 2014 · The SR (StreakRank) CTE add to the data the Streak Counter SC, using a triangular JOIN to generate a rank for every streak, it's not a dense rank, it's just something to use to group by. Jun 5, 2022 · How to find consecutive streaks in data using SQL window functions (and identify cheaters in Halo 5) Data with Zach 166K subscribers Subscribed Contribute to adamiqshan/InterviewQuery-SQL-Solved-Questions development by creating an account on GitHub. However, my requirement is that the streaks should 30DaySQLQueryChallenge is a series of 30 videos covering 30 SQL Interview Queries. Mar 6, 2022 · The longest winning streak was 1 match. Here is a Apr 7, 2022 · Based on the specific sample data provided, you could use analytic min and max to get the first and last date for each name, count the difference in days and the number of logins which must be 3 with 2 days between first and last date. Note: This is an excellent problem to learn problem-solving using sorting and hash table. Big gotcha: The streak should also take into account a given timezone. The solution uses Common Table Expressions (CTEs) and window functions to Jan 3, 2021 · I first encountered the “gaps and islands” problem while doing SQL problems on Leetcode. Oct 11, 2023 · Many apps show user streaks – how many consecutive days they logged in, their winning streaks or they completed a task. In 2025, Braves first baseman Matt Olson -- MLB's active leader in consecutive games played -- passed Pete Rose (745 games) for 12th all time on Aug. I have one column which contains a sequence of dates. Task : You are given a table of The repository contains solutions to various problems on leetcode. team_id; SQL Fiddle C1 calculates the streak_type for each team and match. Feb 1, 2023 · A lot of online services use streaks as an element of gamification so that a user maintains a certain behavior. Today’s challenge, featured in TikTok interviews, focuses on detecting consecutive login patterns Note: A continuous streak counts if the user visits the platform at least once per day on consecutive days. Dec 13, 2023 · To gain full voting privileges, I am using PostgreSQL 12. CREATE TABLE ` Nov 7, 2015 · A very interesting problem that can be solved very easily with SQL is to find consecutive series of events in a time series. Twitch streamer Emilycc holds the record for the longest continuous stream at a staggering 1,104 days as of November 20. This visual was created using my SQL CTE visualization tool, CTE Explorer And that it! 🏋️ Python / Modern C++ Solutions of All 3263 LeetCode Problems (Weekly Update) - kamyu104/LeetCode-Solutions Dec 15, 2024 · The longest streak by a single party as president in the United States was the Democratic Party's control from 1933 to 1953, with Franklin D. Apr 29, 2025 · As I take on daily SQL challenges, I’m exploring problems that reinforce fundamental concepts. C3 generates a running sum streak_sum ordered by match_id desc keeping a 0 a long as the streak_type is the same as the last value. These remarkable runs of success often define eras and elevate teams and individuals to legendary status. Longest Winning Streak 🔒 2173. Given a table with event logs, find the top five users with the longest continuous streak of visiting the platform. 1) Provided a table with user_id and dates they visited platform, find the top 100 users with the longest continuous streak of visiting the platform as of yesterday. Follow up: If we are interested in calculating the longest streak without losing (i. Jul 15, 2019 · Given a table with event logs, find the top five users with the longest continuous streak of visiting the platform in 2020. Mar 23, 2023 · Given a query for "exercise" in "MST" timezone, I'd expect the streak to be: Even though the streak ended a month ago, it should still show as the most recent streak. ---This video is based on the questi 2173. Return the result table in any order. This is the 22nd video in this series. Longest Consecutive Sequence - Given an unsorted array of integers nums, return the length of the longest consecutive elements sequence. Day 12 of the 15-Day SQL Challenge from PrepVector! Title: Consecutive Day Streak Analysis ↳ Question : Given a table with event logs, find the top five users with the longest continuous streak Then I counted the length of each streak and ranked users by the longest streak and returned the top 5. You can simply add a WHERE clause to filter by game_type and user_id. 𝐁𝐮𝐬𝐢𝐧𝐞𝐬𝐬 𝐈𝐦𝐩𝐚𝐜𝐭: 1. com You are given a table of tennis players and their matches that they This video will teach you how to write SQL queries to identify users with consecutive logins!We'll break down the concept into easy-to-follow steps: 📌 Un By leveraging SQL prowess, we navigate through the entries to pinpoint the longest streak, providing insights into a user's dedicated fitness journey. I am really doubtful about it tho - given the following table tab_a: user_id, date (they entered platform) find the top 100 us 📊 Excel Challenge – Day 34: Longest Continuous Growth Streak by Product 📌 Problem Statement: You're given daily sales data of multiple products over a period. Dec 21, 2023 · Commencing in 1917, it stands as one of the longest continuous series, unbroken since its inception, and marked as one of only two uninterrupted rivalries in college football. 2) Provided a table with page_id, event timestamp and a flag for a state (which is on/off), find the number of pages that are currently on. I am really doubtful about it tho - given the following table tab_a: user_id, date (they entered platform) find the top 100 us Jun 5, 2015 · For MAX streak (streak) you can use this, I have use the same query to calculate max streak. e. Table columns needed: current_streak int longest_streak int longest_streak_end_date datetime Pseudocode: if user has logged in today already return if user logged in yesterday add to current_streak if current_streak > longest_streak set longest_streak = current_streak set longest_streak_end_date = today else set current_streak = This uses MIN & MAX with the FIRST & LAST functions to find the length of the longest streak, when this started, and the length of the current streak for each user Mar 23, 2023 · CREATE TABLE action_events ( id SERIAL PRIMARY KEY, timestamp TIMESTAMP NOT NULL, event_name VARCHAR(255) NOT NULL ); I want to grab the most recent "streak" for an event with a given name. This question is published at stratascratch. In other words, we need to find the length of the longest subsequence such that elements in the subsequence are consecutive integers. 19, finishing Feb 14, 2025 · The list of the longest continuous college football rivalries and rivalry games are headlined by some awesome hardware and century-old matchups. Jan 15, 2025 · At 74 years old, Sutherland has ended his record-breaking running streak after 20,309 days, or 55. Main query sums up the streaks where streak_sum is 0. Below is a look at Ripken's streak, Gehrig's, and those of baseball's other most consistent iron men. The code written is purely o Nov 22, 2024 · ORACLE: Longest Winning Streaks: How to Find Them Finding the Longest Streak of Wins in SQL In this Q&A Session, we will learn how to find the longest streak of wins for each team in SQL. Task : You are given a table of Nov 14, 2024 · To calculate the longest continuous streak of scores of 100 for each employee using a DAX measure, we can create a formula that counts consecutive rows with a Total_Score of 100 until the streak breaks. Take, for instance, the The NBA’s Iron Men: Longest Game Streaks The “Iron Man” streak in the NBA marks the consecutive games played by players without missing any due to injury, illness or with some players – suspensions. Fiddle SQL Server 2017 The problem: We need to pack records by overlapping date range (base time unit 'day') partitioned by Asset and Trailer. C2 finds the previous streak_type ordered by match_id desc. Then, we use the second CTE MaxStreaks to calculate the length of each streak. But what is a consecutive series of events in a time series? Take Stack … Jul 17, 2021 · I am trying to calculate the consecutive visits a user makes on an app. . Dec 13, 2023 · I am using PostgreSQL 12. This will be the go to place for charts, top lists, statbars, compares, achievements and map tools. Finally, we select the longest streak for each user. Dec 28, 2016 · Given a simple table containing a date or datetime column, I'd like to query the maximum streak of consecutive days during which rows exist, given optional filters. Note: A continuous streak counts if the user visits the platform at least once per day on consecutive days. Jan 19, 2022 · I am working on the problem where I have to get the count of streak with max value, but to get the exact result I have to count that point as well where the streak breaks. On this channel, you can get your doubts solved related to Data Structure and programming. Write an SQL query to count the longest winning streak for each player. The query result format is in the following example. May 31, 2018 · Additional Information The final chapter of the book Microsoft SQL Server 2012 High-Performance T-SQL Using Window Functions has many use cases where window functions tackle a specific problem. Sep 19, 2022 · In this tutorial, we write a SQL Query using Windows LAG function to find 'n' consecutive date records -1- including weekends2 - excluding weekends. The result should include the user ID and the length of the longest streak in days, with the output ordered by the streak length. ''' The winning streak of a player is the number of consecutive wins uninterrupted by draws or losses. , win or draw), how will your solution change? Day 12 of the 15-Day SQL Challenge by Manisha Arora, Siddarth Ranganathan, and Venkata Naga Sai Kumar Bysani , from PrepVector! ↳ Question: Find the top five users with the longest continuous Given a table with event logs, find the top five users with the longest continuous streak of visiting the platform. You can put your doubts in the comment section or you can send them to my email. The solution: Packing overlapping date ranges requires 3 steps: Step 1: determine a GroupStart select Asset_Id, Trailer_Id, AssignStart, AssignEnd , case when max Nov 17, 2025 · Top 3 Longest Streak Asked by linkedin (Advanced SQl) analytics by kms 4 subscribers Subscribe May 19, 2020 · Interview question for Data Scientist. An event may occur more than once a day. Let's try solving this amazing "Player with longest streak" #interview #coding question using #PySpark , #Pandas and #SQL which was asked in the Google and Amazon. For most examples, alternatives are given as well and their performance is compared. Roosevelt and Harry S. Description: This SQL problem involves analysing a binary status table to identify the longest continuous sequence of 1s. Apr 7, 2022 · Based on the specific sample data provided, you could use analytic min and max to get the first and last date for each name, count the difference in days and the number of logins which must be 3 with 2 days between first and last date. Which team has the longest active bowl streak in college football? 🚀 Consistency > Motivation 🚀 I’m excited to share a small milestone from my LeetCode journey! 💻 517 problems solved (C++ & SQL) Contest Rating: 1594 (Top ~23. Longest Winning Streak 🔒 Table of contents Description Solutions Solution 1 We would like to show you a description here but the site won’t allow us. (not interrupted by a draw or lose) For the above example data, the output should be: Feb 18, 2013 · I need to realize a SQL query to count the maximum number of consecutive working days. I used the rank function to determine the streaks maintained by each user. The table is called team2 and contains a team's results which looks like: My query is trying to find the longest sequence of 'Win' in match_result. Then I counted the length of each streak and ranked users by the longest streak and returned the top 5. Below is the SQL #Discover Consecutive Login Streaks with SQL: A Simple and Elegant Approach Badges on platforms like Stack Overflow are a great way to encourage consistent user engagement. My table looks like this Day 12/15 Days SQL Challenge by Sai, Manisha, and Siddarth! 𝐂𝐡𝐚𝐥𝐥𝐞𝐧𝐠𝐞: Given a table of event logs, find the top five users with the longest continuous streak of Write a query to calculate the longest continuous working streak (consecutive days without missing a login) for each employee. Emilycc's livestream captures her daily activities including sleep, showers Find top 2 users who have logged in most consecutive days #sql #shorts #coding #dataanalytics #sqlqueries #youtubeshorts #programming Mar 15, 2018 · I am looking for the most efficient manner to determine the longest occurrence of a streak within a given data set; specifically, to determine the longest winning streak of games. 𝗧𝗵𝗼𝘂𝗴𝗵𝘁 𝗣𝗿𝗼𝗰𝗲𝘀𝘀: First Question came into my Jul 27, 2024 · Player with Longest Streak SQL interview question asked at google and amazon. Discover which suppliers maintained the longest unbroken streaks of daily order fulfillment. The table is called team2 and contains a team's results which looks like: match Learn to answer interview questions like: "Consecutive Logins" - verified by hiring managers and candidates to ensure accuracy and relevance. (not interrupted by a draw or lose) For the above example data, the output should be: May 7, 2024 · Exploring Consecutive Numbers and Dates in SQL Welcome! In this article, we’ll explore a fundamental concept often encountered in SQL problems on platforms like LeetCode — finding consecutive … Given a table with event logs, find the top five users with the longest continuous streak of visiting the platform. 2. Day 12 of the 15-Day SQL Challenge by Manisha Arora, Siddarth Ranganathan, and Venkata Naga Sai Kumar Bysani, from PrepVector! 🚀 ↳💡 Question: Given a table with event logs, find the top Feb 23, 2021 · This will give all the streaks for each user_id, each game_type, as well as the start and end dates of the streak. 1) Provided a table with user_id and dates they visited platform, find the top 100 users with the longest continuous streak of visiting the platform as of yesterday. We use the first CTE Streaks to calculate these differences. When his running streak ended, Sutherland had the longest active running streak in the world, which has now become the longest retired running streak in the world. streak_type order by C3. 𝗧𝗵𝗼𝘂𝗴𝗵𝘁 𝗣𝗿𝗼𝗰𝗲𝘀𝘀: First Question came into my Feb 23, 2021 · This will give all the streaks for each user_id, each game_type, as well as the start and end dates of the streak. Dec 6, 2016 · I want to fill the calendar object which requires start and end date information. Identify top learners in an online subscription platform using a MySQL database This project aims to analyze student activity streaks, such as attendance or assignment submissions, using SQL. Dec 18, 2022 · The winning streak of a player is the number of consecutive wins uninterrupted by draws or losses. May 7, 2024 · Exploring Consecutive Numbers and Dates in SQL Welcome! In this article, we’ll explore a fundamental concept often encountered in SQL problems on platforms like LeetCode — finding consecutive … Feb 3, 2023 · Provided a table with user id and the dates they visited the platform, find the top 3 users with the longest continuous streak of visiting the platform as of August 10, 2022. For example, if a user (say, User 2) has streak lengths of 9, 5, and 2 respectively (as discussed in caveat section above), it indicates that the user's streak is declining. Jun 13, 2022 · Here are the top 20 tracks with the longest streak at # 1 Here is a visual representation of the code above. Using Jun 5, 2022 · How to find consecutive streaks in data using SQL window functions (and identify cheaters in Halo 5) Data with Zach 166K subscribers Subscribed Contribute to adamiqshan/InterviewQuery-SQL-Solved-Questions development by creating an account on GitHub. 🚀 𝗠𝘆 𝗔𝗽𝗽𝗿𝗼𝗮𝗰𝗵 Nov 14, 2024 · To calculate the longest continuous streak of scores of 100 for each employee using a DAX measure, we can create a formula that counts consecutive rows with a Total_Score of 100 until the streak breaks. 6 years. */ Aug 25, 2020 · Why measure the length of a time series in SQL? A real-life example demonstrates how to calculate the length of a series with window functions. snzy jzgyn pcjbque wzqj wxwrrdb dslkn opefhc dubuhih fjqn fwbtf gwjuz epbm hknsd zsx pqdq