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Exam 1z0-071 topic 1 question 96 discussion

Actual exam question from Oracle's 1z0-071
Question #: 96
Topic #: 1
[All 1z0-071 Questions]

Which two are true about unused columns? (Choose two.)

  • A. Setting an indexed column to unused results in an error.
  • B. You can query the data dictionary to see the names of unused columns.
  • C. You can specify multiple column names in an ALTER TABLE...SET UNUSED statement.
  • D. If you set all the columns of a table to unused, the table is automatically dropped.
  • E. CASCADE CONSTRAINTS must be specified when setting a column to unused if that column is referenced in a constraint on another column.
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Suggested Answer: CE 🗳️
by Sbablo at May 26, 2023, 4:49 p.m.

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ShahedOdeh
6 months, 2 weeks ago
C and D
upvoted 1 times
ShahedOdeh
6 months, 2 weeks ago
B and C
upvoted 1 times
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lucemqy
1 year, 4 months ago
Selected Answer: CE
CE is correct you can see number of unused columns but not their names in the data dictionary
upvoted 1 times
ShahedOdeh
6 months, 2 weeks ago
no we have the USER_TAB_COLUMNS dictionary that is showing the unused columns
upvoted 1 times
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musafir
1 year, 9 months ago
B C E are all correct according to Oracle "SET UNUSED Clause" https://docs.oracle.com/en/database/oracle/oracle-database/23/sqlrf/ALTER-TABLE.html#GUID-552E7373-BF93-477D-9DA3-B2C9386F2877
upvoted 2 times
shotcom
1 year, 6 months ago
when you query the dba_unused_col_tabs view which displays a list of all tables with un-used columns, including counts of the number of columns within a table that are unused but it will not show the names of the unused columns so B is wrong
upvoted 5 times
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Nelita
1 year, 10 months ago
Selected Answer: CE
CE ARE CORRECT.
upvoted 1 times
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Sbablo
1 year, 10 months ago
All are wrong except E
upvoted 1 times
shotcom
1 year, 6 months ago
C is correct, you can specify multiple columns in a single alter statement eg: ALTER TABLE EMPLOYEES SET UNUSED (JOB_ID, COMMISSION_PCT);
upvoted 1 times
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Sbablo
1 year, 10 months ago
Correct answer B,E
upvoted 1 times
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