Use the smallest appropriate data type (e.g., VARCHAR(50) instead of VARCHAR(16777216) ) to help BI tool metadata, even though Snowflake stores them similarly.
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Don't over-normalize. In legacy systems, you would normalize to 3rd Normal Form (3NF) to save space. In Snowflake, space is cheap. Joining tables costs compute time. It is often better to flatten a dimension into a single table (creating a "wide" dimension) to reduce the number of joins during a query.