How many columns are presented after executing this query: SELECT address1||','||address2||','||address2 "Address" FROM employee;

  1. 1

  2. 2

  3. 3

  4. 4


Correct Option: A

AI Explanation

To answer this question, let's break down the query:

The query is selecting three columns: address1, address2, and address2. However, these columns are concatenated using the double pipe operator (||) and separated by commas.

So, after executing the query, the result will be a single column called "Address" that contains the concatenated values of address1, address2, and address2 (which seems to be a typo and should probably be address3).

Therefore, the correct answer is A) 1.

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