Databricks Certified Data Engineer - Associate
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Consider a scenario where you are tasked with updating a large dataset in a data warehouse. The dataset is frequently updated with new records and some records need to be overwritten due to changes in business requirements. Which SQL command would you use to efficiently handle this scenario, and why? Discuss the differences between using CREATE OR REPLACE TABLE and INSERT OVERWRITE in this context.
Consider a scenario where you are tasked with updating a large dataset in a data warehouse. The dataset is frequently updated with new records and some records need to be overwritten due to changes in business requirements. Which SQL command would you use to efficiently handle this scenario, and why? Discuss the differences between using CREATE OR REPLACE TABLE and INSERT OVERWRITE in this context.
Explanation:
INSERT OVERWRITE is suitable for scenarios where you need to overwrite specific partitions or the entire table with new data, without changing the table schema. This is more efficient than CREATE OR REPLACE TABLE, which involves dropping and recreating the table, potentially leading to downtime and schema changes that might not be necessary.