How does the performance of a subquery differ from that of a join in DB2?

  • Joins are faster than subqueries
  • Joins process data in sets
  • Subqueries are faster than joins
  • Subqueries process data row by row
In DB2, joins generally outperform subqueries because they process data in sets rather than row by row. This makes joins more efficient, especially for large datasets. 
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