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Incremental Ingestion with Watermark and Lookback Window

intermediate~10 min15 pts
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Problem

Write an incremental SQL extraction query for our orders pipeline. To protect against late-arriving records, extract all rows from source_orders where updated_at is greater than or equal to the previous watermark minus a 1-hour lookback window, and strictly less than the current execution batch cutoff timestamp.

sqlpipelineincrementaletl
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SQL Editor

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Topfolio

Learn data analytics online. Real skills, real projects, real community.

courses

  • Career Tracks
  • Work Experience
  • Best Data Analyst Course in India
  • SQL Fundamentals
  • SQL Advanced
  • Python for Data
  • Micro Free Courses

practice

  • SQL Fundamentals Interview Test
  • SQL Advanced Coding Test
  • All Practice Tests

resources

  • How to Become a Data Analyst
  • SQL Interview Questions
  • Data Analyst Salary Guide
  • Free Datasets for Practice
  • SQL vs NoSQL Guide
  • Data Analyst vs Data Engineer vs Data Scientist

employers

  • Enterprise Screening
  • AI Proctoring Demo
  • Volume Pricing
  • Employer Portal

company

  • About
  • Terms
© 2026 Topfolio. All rights reserved.Made with ❤️ for aspiring analysts