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95th Percentile Latency SQL
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95th Percentile Latency SQL

MediumSQL · PostgreSQL

Problem

Given a table of API response times, write a query to find the 95th percentile of latency per day.

Use PostgreSQL syntax. Ignore NULL latency values when calculating the percentile.

Output

  1. One row per calendar day with response data
  2. Columns: response_date, p95_latency_ms
  3. Return the percentile in milliseconds, rounded to two decimal places
  4. Order rows by response_date ascending

Schema

api_response_times
ColumnTypeDescription
response_idPKINTUnique identifier for the API response record
response_atTIMESTAMPTimestamp when the API response was recorded
latency_msNUMERIC(10,2)API response latency in milliseconds
endpointVARCHAR(100)API endpoint that produced the response
Tablesapi_response_times
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