ORACLE 1Z0-071 PDF QUESTIONS–IDEAL MATERIAL FOR QUICK PREPARATION

Oracle 1z0-071 PDF Questions–Ideal Material for Quick Preparation

Oracle 1z0-071 PDF Questions–Ideal Material for Quick Preparation

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Oracle Database SQL Sample Questions (Q320-Q325):

NEW QUESTION # 320
Which four statements are true regarding primary and foreign key constraints and the effect they can have on table data?

  • A. Only the primary key can be defined at the column and table level.
  • B. It is possible for child rows that have a foreign key to be deleted automatically from the child table at the time the parent row is deleted
  • C. It is possible for child rows that have a foreign key to remain in the child table at the time the parent row is deleted.
  • D. Primary key and foreign key constraints can be defined at both the column and table level.
  • E. A table can have only one primary key and one foreign key.
  • F. The foreign key columns and parent table primary key columns must have the same names.
  • G. A table can have only one primary key but multiple foreign keys.

Answer: B,D,G

Explanation:
Primary and foreign key constraints are foundational to relational database design:
* Option A: Incorrect. Both primary and foreign key constraints can be defined at the column or table level.
* Option B: Incorrect. Foreign key columns do not need to have the same names as the corresponding primary key columns in the parent table. They must be of the same data type and size.
* Option C: Incorrect. If a foreign key constraint is enforced without ON DELETE CASCADE, deleting the parent row will either prevent the delete (due to constraint) or require a prior deletion or update of the child rows.
* Option D: Correct. A table can indeed have only one primary key, which uniquely identifies each row, but it can have multiple foreign keys linking to primary keys of different tables.
* Option E: Correct. Both types of keys can be defined at either level, providing flexibility in how constraints are applied and enforced.
* Option F: Incorrect. A table can have multiple foreign keys as stated, each referencing a different parent table.
* Option G: Correct. If the ON DELETE CASCADE option is set for a foreign key, then deleting a parent row will automatically delete the corresponding child rows, maintaining referential integrity.


NEW QUESTION # 321
Which statement is true regarding the INTERSECT operator?

  • A. The number of columns and data types must be identical for all SELECT statements in the query.
    INTERSECT Returns only the rows that occur in both queries' result sets, sorting them and removing duplicates.
    The columns in the queries that make up a compound query can have different names, but the output result set will use the names of the columns in the first query.
  • B. It ignores NULLs.
  • C. Reversing the order of the intersected tables alters the result.
  • D. The names of columns in all SELECT statements must be identical.

Answer: A


NEW QUESTION # 322
Examine the data in the EMP table:

You execute this query:
SELECT deptno AS "Department", AVG(sal) AS AverageSalary, MAX(sal) AS "Max Salary" FROM emp WHERE sal >= 12000 GROUP BY "Department " ORDER BY AverageSalary; Why does an error occur?

  • A. An alias name must not be used in a GROUP BY clause.
  • B. An alias name must always be specified in quotes.
  • C. An alias name must not be used in an ORDER BY clause.
  • D. An allas name must not contain space characters.

Answer: A


NEW QUESTION # 323
Examine the structure of the SALES table.

Examine this statement:

Which two statements are true about the SALES1 table? (Choose two.)

  • A. It has PRIMARY KEY and UNIQUE constraints on the selected columns which had those constraints in the SALES table.
  • B. It will not be created because the column-specified names in the SELECT and CREATE TABLE clauses do not match.
  • C. It is created with no rows.
  • D. It will have NOT NULL constraints on the selected columns which had those constraints in the SALES table.
  • E. It will not be created because of the invalid WHERE clause.

Answer: C,D


NEW QUESTION # 324
Which three statements are true about the ALTER TABLE....DROP COLUMN....command?

  • A. A column can be dropped only if it does not contain any data.
  • B. A parent key column in the table cannot be dropped.
  • C. A column can be dropped only if another column exists in the table.
  • D. A dropped column can be rolled back.
  • E. The column in a composite PRIMARY KEYwith the CASCADEoption can be dropped.

Answer: B,C,E


NEW QUESTION # 325
......

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