Daily Error Count Change

A medium SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.

Domain

SQL

Difficulty

medium

Seniority

L4

Problem

SRE wants a daily trend chart for error volume. For each day errors were recorded, show the number of errors that landed that day, how many landed the day before, and how much it moved. Order from earliest day to latest. The first day on record has no prior day to compare against.

Summary

Errors, trending up or down?

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