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Exam 1z0-071 topic 1 question 229 discussion

Actual exam question from Oracle's 1z0-071
Question #: 229
Topic #: 1
[All 1z0-071 Questions]

Which four statements are true about constraints on Oracle tables? (Choose four.)

  • A. A PRIMARY KEY constraint can be added after a table has been created and populated.
  • B. A FOREIGN KEY column can contain NULLs.
  • C. A CHECK constraint can refer to values in other rows.
  • D. A NOT NULL constraint can be defined at the table level.
  • E. A UNIQUE constraint can use a pre-existing index on the constrained column or columns.
  • F. A UNIQUE constraint permits NULLs.
  • G. A column can have only one CHECK constraint.
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Suggested Answer: ABEF 🗳️
by CMjer at May 31, 2023, 8:38 a.m.

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yaya32
6 months, 1 week ago
Selected Answer: ABEF
ABEF seems correct
upvoted 1 times
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lucemqy
8 months, 3 weeks ago
Selected Answer: ABEF
ABEF is correct
upvoted 1 times
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fasolazgrochem
11 months ago
Selected Answer: ABEF
ABEF are corecct
upvoted 3 times
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Orxan_H
1 year ago
Selected Answer: BCEF
For my opinion correct answers BCEF
upvoted 1 times
lucemqy
8 months, 3 weeks ago
Check constraint can't refer to other columns
upvoted 1 times
mrcsp
5 months, 3 weeks ago
If it's a table constraint it can. create table constr ( total_lectures number(10), total_absences number(10), check (total_lectures >= total_absences) );
upvoted 1 times
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zouve
1 year ago
maybe it's ABDEF ?
upvoted 1 times
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CMjer
1 year, 2 months ago
Selected Answer: ABEF
A, B, E, F are true. https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/constraint.html#GUID-1055EA97-BA6F-4764-A15F-1024FD5B6DFE
upvoted 4 times
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C (25%)
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