# A daily clickstream lands as one giant Parquet file in S3

Canonical URL: <https://datadriven.io/problems/a-daily-clickstream-lands-as-one-giant-parquet-file-in-s3-a-3f8b5f8b>

Domain: Pipeline Design · Difficulty: medium

## Problem

A daily clickstream lands as one giant Parquet file in S3. Analysts only ever query a single day at a time but every query scans the whole table. Lay out the storage so a one-day query reads one day of data.

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