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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• Wrong explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) It is a primary key for a Dimension table - This option is incorrect. A surrogate key is not specifically a primary key for a Dimension table. It can be used as a primary key, but it is not limited to that role.

Option B) It is a system-generated sequence number - This option is correct. A surrogate key is a unique identifier that is generated by the system, typically using a sequence number or an auto-incrementing value. It is used to uniquely identify records in a table and is not derived from any meaningful data.

Option C) It is a unique key - This option is partially correct. A surrogate key is indeed a unique key, but its uniqueness is achieved by being generated by the system rather than being inherently unique based on the data it represents.

Option D) It is a foreign key for a FACT table - This option is incorrect. A surrogate key is not specifically a foreign key for a FACT table. While it can be used as a foreign key, it is not limited to that role.

The correct answer is B) It is a system-generated sequence number. This option is correct because a surrogate key is a unique identifier generated by the system, typically using a sequence number or an auto-incrementing value, to uniquely identify records in a table.

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• Wrong explanation