Scenario: A developer is tasked with retrieving data from multiple tables in DB2 using joins and subqueries. However, they encounter challenges in structuring the query correctly. How can the developer approach this problem effectively?

  • Breaking down the query into smaller, manageable parts
  • Refactoring the query to eliminate unnecessary joins
  • Using table aliases to simplify the query
  • Utilizing common table expressions (CTEs)
Breaking down the query into smaller, manageable parts allows the developer to focus on individual components, making it easier to understand and debug. This approach also helps in optimizing the query by identifying performance bottlenecks in each part. 
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