Perform a complete deletion of all records in 'customer_data' followed by inserting all data from 'staging_customer_updates' to ensure the latest data is reflected.

Employ the MERGE INTO statement to efficiently update existing records and insert new ones from 'staging_customer_updates' into 'customer_data' based on 'customer_id'.

Conduct a daily manual review of 'staging_customer_updates' and write custom SQL scripts to update or insert records into 'customer_data' as needed.

Use the APPLY CHANGES INTO statement with 'customer_id' as the key to automatically update and insert records from 'staging_customer_updates' into 'customer_data'.