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

  1. 1

  2. 2

  3. 3

  4. 0

  5. 4


Correct Option: C

AI Explanation

To determine the number of columns presented after executing the given query, let's break down the query and analyze it step by step:

The query is: SELECT address1||','||address2||','||address2 "Adress" FROM employee;

Here, we are selecting three columns: address1, address2, and address2 (renamed as "Address" using the alias "Adress"). Each column is concatenated with a comma (',').

So, the query will produce three columns: address1, address2, and Address.

Therefore, the correct answer is C) 3.

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