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CompTIA DS0-001 Exam - Topic 1 Question 43 Discussion

Actual exam question for CompTIA's DS0-001 exam
Question #: 43
Topic #: 1
[All DS0-001 Questions]

A database administrator is migrating the information in a legacy table to a newer table. Both tables contain the same columns, and some of the data may overlap.

Which of the following SQL commands should the administrator use to ensure that records from the two tables are not duplicated?

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Suggested Answer: A

The SQL command that the administrator should use to ensure that records from the two tables are not duplicated is option A. This command uses theUNIONclause to combine the records from the legacy table and the newer table into a single result set. TheUNIONclause also eliminates any duplicate records that may exist in both tables, and sorts the result by default. The other options either do not produce the desired result or have syntax errors. For example, option B would join the records from the two tables based on a common column, but not remove any duplicates; option C would return only the records that are common to both tables, but not the ones that are unique to each table; option D would produce a Cartesian product of the records from the two tables, which would increase the number of duplicates.Reference:CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.2 Given a scenario, execute database tasks using scripting and programming languages.


by Caprice at Jul 08, 2025, 02:38 PM

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Colby
2 months ago
I'm not so sure about UNION... what if the data isn't identical?
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Brinda
2 months ago
CROSS JOIN? No way, that's not right!
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Roselle
3 months ago
Wait, isn't INTERSECT better for finding common records?
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Vi
3 months ago
Yeah, totally agree with that!
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Chana
3 months ago
I think UNION is the way to go for avoiding duplicates.
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An
3 months ago
CROSS JOIN seems off for this scenario; I don’t recall it being used for merging tables without duplicates.
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Truman
4 months ago
INTERSECT sounds familiar, but I feel like it’s more about finding common records rather than preventing duplicates in this case.
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India
4 months ago
I remember practicing with JOINs, but I don't think that's what we need here since we're not trying to combine rows based on a condition.
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Brittni
4 months ago
I think UNION might be the right choice since it combines results and can eliminate duplicates, but I'm not entirely sure.
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Yoko
4 months ago
This is a straightforward question, in my opinion. The answer is clearly B, JOIN. That's the SQL command that allows you to combine data from multiple tables while ensuring you don't get any duplicates.
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Georgeanna
4 months ago
Okay, I think I've got it. The key here is to avoid duplicating records, so INTERSECT would be the best choice. It returns only the rows that are common to both tables, which should give us the unique records.
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Edna
5 months ago
I'm a bit confused on this one. I know JOIN is used to combine rows from two tables, but I'm not sure if that's the right approach here. Maybe I should double-check the definitions of these SQL commands.
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Alison
5 months ago
Hmm, this seems like a tricky one. I'm thinking UNION might be the way to go, since it combines the results of two queries while removing any duplicate rows.
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