Learn how to use Snowflake’s ASOF JOIN with a real-world stock market scenario using TRADES and QUOTES tables. You will see why normal joins fail with time-series data, and how ASOF JOIN helps you match each trade to the most recent market price at or before the trade time. This video walks through the problem statement, table design, sample data, and a clear ASOF JOIN query you can reuse in your own projects.

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ASOF JOIN is a SQL join type supported in Snowflake that handles time series and event-driven data by matching rows on timestamp fields using exact or nearest-preceding/following values. Using a trading platform example with trades and quotes tables, the tutorial demonstrates how ASOF JOIN solves the problem of joining records where timestamps don't exactly align — finding the most recent market price in effect at the moment each trade was executed. The syntax uses a standard ON clause for equality conditions plus a MATCH_CONDITION clause for the timestamp comparison.

Snowflake ASOF JOIN in 7 Minutes | New SQL JOIN