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最新的 Oracle PL/SQL Developer Certified Associate 1z0-071 免費考試真題 (Q205-Q210):

問題 #205
You are designing the structure of a table in which two columns have the specifications:
COMPONENT_ID- must be able to contain a maximum of 12 alphanumeric characters and must uniquely identify the row EXECUTION_DATETIME- contains Century, Year, Month, Day, Hour, Minute, Second to the maximum precision and is used for calculations and comparisons between components.
Which two options define the data types that satisfy these requirements most efficiently? (Choose two.)

  • A. The EXECUTION_DATETIME must be of DATE data type.
  • B. The COMPONENT_IDmust be of ROWID data type.
  • C. The COMPONENT_IDcolumn must be of CHAR data type.
  • D. The EXECUTION_DATETIME must be of TIMESTAMP data type.
  • E. The EXECUTION_DATETIME must be of INTERVAL DAY TO SECOND data type.
  • F. The COMPONENT_IDmust be of VARCHAR2 data type.

答案：A,C

解題說明：
Explanation

 

問題 #206
View the Exhibit and examine the structure in the DEPARTMENTS tables. (Choose two.)
1z0-071-97ffe831bf61b6833878114c9851ff7d.jpg
Examine this SQL statement:
SELECT department_id "DEPT_ID", department_name, 'b' FROM
departments
WHERE departments_id=90
UNION
SELECT department_id, department_name DEPT_NAME, 'a' FROM
departments
WHERE department_id=10
Which two ORDER BY clauses can be used to sort the output?

  • A. ORDER BY 3;
  • B. ORDER BY DEPT_NAME;
  • C. ORDER BY 'b';
  • D. ORDER BY DEPT_ID;

答案：A,D

解題說明：
Explanation/Reference:

 

問題 #207
Examine the data in the COLORS table:
1Z0-071-e6d977ba384ead49dfba79ef6d436f5b.jpg
Examine the data in the BRICKS table:
1Z0-071-391086e0dd31f3c57d3d7dfa0db1d246.jpg
Which two queries return all the rows from COLORS?

  • A. All conditions evaluated using CASE can also be evaluated using DECODE.
  • B. Both CASE and DECODE are functions.
  • C. AIl conditions evaluated using DECODE can also be evaluated using CASE.
  • D. CASE is a function and DECODE is not.
  • E. Neither CASE nor DECODE is a function.
  • F. DECODE is a function and CASE is not.

答案：A,F

 

問題 #208
Which three statements are true about performing DML operations on a view with no INSTEAD OF triggers defined?

  • A. Views cannot be used to query rows from an underlying table if the table has a PRIMARY KEY and the primary key columns are not referenced in the defining query of the view.
  • B. Views cannot be used to add rows to an underlying table If the table has columns with NOT NULL constraints lacking default values which are not referenced in the defining query of the view.
  • C. Views cannot be used to add or modify rows in an underlying table If the defining query of the view contains the DISTINCT keyword.
  • D. The WITH CHECK clause has no effect when deleting rows from the underlying table through the view.
  • E. Insert statements can always be done on a table through a view.
  • F. Delete statements can always be done on a table through a view.

答案：B,C

解題說明：
* A: Insert statements can be done through a view only if all NOT NULL constraints without default values of the base table are included in the view. Therefore, statement A is incorrect.
* B: The WITH CHECK OPTION ensures that all DML operations performed through the view result in data that conforms to the view's defining query. It affects DELETE as well as other DML operations, making statement B incorrect.
* C: Similar to inserts, DELETE operations can be done through a view unless the view contains constructs that inherently do not support it, such as certain joins or set operations. Statement C is generally incorrect.
* D: If a view does not include all NOT NULL columns without defaults of the underlying table, it cannot be used to add rows because the missing columns will lack values. This makes statement D correct.
* E: This statement is incorrect as primary keys do not affect querying through views; they affect insert and update operations where uniqueness and non-nullability are enforced.
* F: If the defining query of a view includes DISTINCT, the view generally cannot be used to perform update or insert operations as it may not be able to uniquely determine rows. This makes statement F correct.

 

問題 #209
You must write a query that prompts users for column names and conditions every time it is executed.
The user must be prompted only once for the table name.
Which statement achieves those objectives?

  • A. SELECT &col1, &col2FROM &&tableWHERE &condition = &&cond
  • B. SELECT &col1, &col2FROM "&table"WHERE &condition = &cond;
  • C. SELECT &col1, &col2FROM &&tableWHERE &condition = &cond;
  • D. SELECT &col1, '&col2'FROM &tableWHERE &&condition = '&cond';

答案：C

 

問題 #210
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