Coding Series - SQL : Consecutive Numbers At least 3 Times

Video 135: This is the 33rd video in our series "Crack SQL Interview in 50 Questions," and in this exercise, we explore the topic of "Advanced Select and Joins." In this video, we explore four different approaches to solve the problem of finding numbers that appear at least three times consecutively in a given sequence. Approach 1: We use self-join operations to compare each number with its consecutive neighbors. While effective, this approach may not be scalable for large datasets. Approach 2: Utilizing the LEAD() and LAG() window functions, we identify consecutive numbers based on their positions in the sequence. This method provides a more efficient solution compared to self-join. Approach 3: Leveraging the ROW_NUMBER() window function, we assign a unique row number to each number in the sequence. By analyzing the difference between the row number and the actual position, we identify consecutive numbers. Approach 4: Using only the LEAD() window function, we directly compare each number with its second and third neighbors to identify consecutive occurrences. These approaches offer various strategies to tackle the problem, each with its own strengths and limitations. By understanding these techniques, you can gain insight into efficient problem-solving strategies in SQL. For a comprehensive understanding of these SQL methodologies and their application, please refer to this explanatory video. code: https://github.com/jeganpillai/crack_sql_interview_in_50_questions/blob/main/seq01_33_consecutive_numbers_atleast_3_times.sql Follow me on, Website : https://growwithdata.co/ YouTube : https://www.youtube.com/@growwithdata TikTok : https://www.tiktok.com/@growwithdata LinkedIn : https://www.linkedin.com/company/growwithdata/ Facebook : https://www.facebook.com/growwithdata.co/ twitter : https://twitter.com/growwithdata_co Instagram : https://www.instagram.com/growwithdata.co/ WhatsApp : https://whatsapp.com/channel/0029VaF8pkb77qVNfbp5pA0S #sql #dataengineers #tablejoins #ceil #floor #bucket #meta #google #facebook #apple #paypal #netflix #amazon #deinterview #sqlinterview #interviewquestions #leetcode #faang #maanga #mysql #oracle #dbms #query #sqlserver #mysql #coderpad #aggregates #aggregation #nonaggregation #database #placementpreparation #lead #lag #windowsfunction #nullcheck #coalesce #sqlperformance #ifnull #case #lead #lag #windowsfunction #tamil #tamilpython #tamilinterview #tamilinterviewlatest #tamilinterviewquestions #sqlintamil