Multiple choice technology databases

There are 4 sources.Then how many Joiner transformations required to join the sources?

  1. 1

  2. 2

  3. 3

  4. None
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C Correct answer
Explanation

To join 4 sources, you need 3 Joiner transformations. The Joiner transformation only accepts two inputs at a time. The strategy is to join the first two sources (Joiner #1), then join that result with the third source (Joiner #2), and finally join that result with the fourth source (Joiner #3). For N sources, you need N-1 Joiner transformations arranged in a cascading fashion.

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