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Exam 1z0-071 topic 1 question 67 discussion

Actual exam question from Oracle's 1z0-071
Question #: 67
Topic #: 1
[All 1z0-071 Questions]

Examine this statement:

What is returned upon execution?

  • A. an error
  • B. 2 rows
  • C. 0 rows
  • D. 1 row
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Suggested Answer: D 🗳️
by Rik92 at Feb. 16, 2023, 2:29 p.m.

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826cb95
1 week, 3 days ago
Selected Answer: A
Important SQL Rule: In Oracle SQL, NULL is not equal to another NULL. That means: sql Copy Edit NULL = NULL → FALSE (or unknown, technically) The INTERSECT operator returns only the distinct rows that are equal in both sets. Since NULL ≠ NULL, even if the rows look the same, Oracle treats them as not equal thus ERROR!
upvoted 1 times
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lucemqy
11 months, 3 weeks ago
Selected Answer: D
INTERSECT will only keep rows that exists for both tables so only 1 row remaining
upvoted 1 times
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metallers
1 year ago
Selected Answer: D
Checked
upvoted 1 times
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zouve
1 year, 4 months ago
D tested select 1 as id, 'john' as first_name, NULL as commission from dual intersect select 1, 'john' as name, null from dual order by 3;
upvoted 2 times
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J4vi
1 year, 5 months ago
Selected Answer: D
It returns 1 row, because the values are the same. I do tested as well
upvoted 2 times
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Rik92
1 year, 8 months ago
tested on 19c, returns 0 rows.
upvoted 1 times
DiDivision
1 year, 8 months ago
it does return 1 rows, it is fast to test.
upvoted 2 times
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9ramone7
6 months, 3 weeks ago
tested on livesql.oracle.com and it does produce 1 row
upvoted 1 times
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