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Multiple ChoiceBeginner 30s

SELECT with JOIN

Choose the best answer for: SQL joins
Options
  1. 1JOINs are always slow so they should be avoided in every query plan
  2. 2Only one join type exists and all others are merely syntactic sugar
  3. 3No joins are ever needed because foreign keys denormalize the rows
  4. 4INNER JOIN: matching rows; LEFT JOIN: all left + matching right
fullstackbeginner

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