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Goolge BigQuery: JOIN and GROUPBY EACH. And Something Is Wrong With SQL

New features added to Google BigQuery:

  • Big JOIN: use SQL-like queries to join very large datasets at interactive speeds
  • Big Group Aggregations: perform groupings on large numbers of distinct values
  • Timestamp: native support for importing and querying Timestamp data

I read with interest both the announcement and the technical (?) details post about the new SQL keyword EACH introduced by BigQuery to perform JOINs and GROUP BY for “large tables”. Unfortunately I couldn’t find what’s behind this new keyword.

This made me think again of what’s wrong with SQL: almost every engine implementation detail bubbles up to the user creating a new flavor of SQL. Just think about it: EACH has no meaning for either of these operations; is there a NOTEACH JOIN?. But it was needed to instruct the engine to perform the operation differently.

Original title and link: Goolge BigQuery: JOIN and GROUPBY EACH. And Something Is Wrong With SQL (NoSQL database©myNoSQL)