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Exam 1z0-071 topic 1 question 42 discussion

Actual exam question from Oracle's 1z0-071
Question #: 42
Topic #: 1
[All 1z0-071 Questions]

Which three are true about dropping columns from a table? (Choose three.)

  • A. A column must be set as unused before it is dropped from a table.
  • B. A primary key column cannot be dropped.
  • C. Multiple columns can be dropped simultaneously using the ALTER TABLE command.
  • D. A column can be removed only if it contains no data.
  • E. A column that is referenced by another column in any other table cannot be dropped.
  • F. A column drop is implicitly committed.
Show Suggested Answer Hide Answer
Suggested Answer: CF 🗳️
by dexdinh91 at Jan. 13, 2023, 9:31 a.m.

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maksud020
2 weeks, 1 day ago
Selected Answer: CE
answer CEF
upvoted 1 times
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alelejaja
6 months, 2 weeks ago
Selected Answer: CF
You can drop a column that is referenced by another column with CASCADE CONSTRAINTS clause (E), so I only find here 2 correct answers (CF)
upvoted 1 times
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yaya32
11 months ago
Selected Answer: CEF
CEF for me
upvoted 1 times
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jm9999
1 year, 2 months ago
For E, using cascade constraints, I was able to delete a primary key column that was referenced by a foreign key. C and F seem like the only truly correct options.
upvoted 3 times
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TheOracleWasTaken
1 year, 4 months ago
Selected Answer: CEF
If use have on delete then E is indeed right
upvoted 1 times
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J4vi
1 year, 7 months ago
Selected Answer: CF
CF are the most correct, the other options have some special cases
upvoted 2 times
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dexdinh91
1 year, 11 months ago
E is partial correct because you can use ON DELETE clause
upvoted 4 times
KizTine
1 year, 2 months ago
Yes, it is possible to drop this type of column with : ALTER TABLE tableName DROP COLUMN colName CASCADE CONSTRAINT;
upvoted 2 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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