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Oracle Database SQL Sample Questions (Q153-Q158):

NEW QUESTION # 153
You execute the SQL statement:

What is the outcome?

  • A. It fails because the NOT NULL and DEFAULToptions cannot be combined for the same column.
  • B. It fails because the condition for the CNAMESconstraint is not valid.
  • C. It It succeeds and CITYcan contain only 'SEATTLE'or null for all rows.
  • D. It succeeds and an index is created for CITIZEN_ID.

Answer: A


NEW QUESTION # 154
Examine the description of the PROMTIONS table:

You want to display the unique promotion costs in each promotion category.
Which two queries can be used?

  • A. SELECT promo_category, DISTINCT promo_cost PROM promotions ORDER BY 2:
  • B. SELECT DISTINCT promo_category ||'has'|| promo_cost AS COSTS FROM promotions ORDER BY 1;
  • C. SELECT DISTINCT promo_cost ||' in' II DISTINCT promo_category FROM promotions ORDER BY 1;
  • D. SELECT promo_cost, | pxomo_category FROM promotions ORDER BY 1;
  • E. SELECT DISTINCT promo_category, promo_cost FROM promotions ORDER BY 1;

Answer: B,E

Explanation:
To display unique promotion costs in each promotion category, the correct queries that can be used are:
C . SELECT DISTINCT promo_category ||' has '|| promo_cost AS COSTS FROM promotions ORDER BY 1; This query concatenates the promo_category with the literal ' has ' and promo_cost, giving a unique string for each combination of promo_category and promo_cost, which is what we are interested in when we want to list unique costs per category.
D . SELECT DISTINCT promo_category, promo_cost FROM promotions ORDER BY 1; This query selects distinct combinations of promo_category and promo_cost, which is exactly what's required to display unique promotion costs in each category.
Options A, B, and E are incorrect:
A is incorrect because it does not use the DISTINCT keyword to ensure uniqueness.
B has incorrect syntax; the DISTINCT keyword should appear directly after SELECT and applies to all columns, not just one.
E is syntactically incorrect and would not execute because the DISTINCT keyword is not used correctly. It should not appear twice in the SELECT clause.


NEW QUESTION # 155
Examine the structure proposed for the TRANSACTIONStable:

Which two statements are true regarding the storage of data in the above table structure? (Choose two.)

  • A. The TRANS_DATEcolumn would allow storage of dates only in the dd-mon-yyyy format.
  • B. The CUST_CREDIT_VALUEcolumn would allow storage of positive and negative integers.
  • C. The TRANS_VALIDITYcolumn would allow storage of a time interval in days, hours, minutes, and seconds.
  • D. The CUST_STATUScolumn would allow storage of data up to the maximum VARCHAR2size of 4,000 characters.

Answer: B,C


NEW QUESTION # 156
Evaluate the following CREATE TABLE command:

Which statement is true regarding the above SQL statement?

  • A. It would execute successfully and only ORD_ITM_IDX index would be created.
  • B. It would give an error because the USING INDEX is not permitted in the CRETAE TABLE command.
  • C. It would give an error because the USING INDEX clause cannot be used on a composite primary.
  • D. It would execute successfully and two indexes ORD_ITM_IDX and ORD_ITM_ID PK would be created.

Answer: A


NEW QUESTION # 157
Examine the commands used to create DEPARTMENT_DETAILSand COURSE_DETAILS:

You want to generate a report that shows all course IDs irrespective of whether they have corresponding department IDs or not but no department IDs if they do not have any courses.
Which SQL statement must you use?
SELECT course_id, department_id, FROM department_details d RIGHT OUTER JOIN

  • A. department_details d ON (c.department_id=d. department_id)
    SELECT c.course_id, d.department_id FROM course_details c FULL OUTER JOIN
  • B. department_details d ON (c.department_id<>d. department_id)
  • C. course_details c USING (department_id)
    SELECT c.course_id, d.department_id FROM course_details c RIGHT OUTER JOIN
  • D. .department_details d ON (c.depatrment_id=d.department_id)
    SELECT c.course_id, d.department_id FROM course_details c FULL OUTER JOIN

Answer: A


NEW QUESTION # 158
......

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