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How does Snowflake recommend defining a clustering key on a high-cardinality column that includes a 15 digit ID numbered column. ID_NUMBER?
Correct Answer: A
* Clustering keys improve query performance by organizing data to optimize retrieval for frequently queried columns. * For high-cardinality columns like a 15-digit ID, Snowflake recommends bucketing or truncating the column values to reduce cardinality. * The function TRUNC(ID_NUMBER, -6) truncates the ID number by dropping the last 6 digits, reducing the number of unique values while maintaining relevance for clustering. Key Steps: * Use TRUNC to reduce high-cardinality column values for efficient clustering. * Monitor clustering key performance via clustering depth metrics. References: * Snowflake Documentation: Clustering Keys * Snowflake Best Practices for Clustering