Not all NULLS are the same
C
Senior Data Engineer • Contractor / Freelancer • GCP & AWS Certified
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Practical SQL
Part 20 of 50
Short, practical posts on SQL and BigQuery — from core language features to advanced query patterns. A reference for data practitioners at every level.
Computing a hash aggregation in BigQuery
So I've seen Snowflake has an HASH_AGG function. When would we need it? Every time we'd like to work out if ANY value in a group (or the entire table) has changed in any way, even a single extra blank space. While BigQuery does not have it yet, we ca...
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