1z1-071合格体験談、1z1-071テキスト

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Oracle 1z1-071 Exam Overview:

Certification Vendor:	Oracle
Exam Name:	Oracle Database SQL
Exam Number:	1z0-071
Related Certifications:	Oracle Database SQL Certified Associate Oracle Database Administrator Certified Associate (DBA)
Exam Duration:	120 minutes
Available Languages:	Simplified Chinese, Portuguese, English, Japanese, Korean
Certificate Validity Period:	No expiration for this exam/certification
Exam Price:	$245 USD
Exam Format:	Multiple Choice
Passing Score:	63%
Real Exam Qty:	70
Sample Questions:	Oracle 1z1-071 Sample Questions
Exam Way:	Pearson VUE testing center (online proctored option available)
Pre Condition:	No formal prerequisites required, but basic knowledge of relational database concepts is recommended
Official Syllabus URL:	https://education.oracle.com/oracle-database-sql-exam

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Oracle Database SQL 認定 1z1-071 試験問題 (Q299-Q304):

質問 # 299
Examine this query:
SELECT 2 FROM dual d1 CROSS JOIN dual d2 CROSS JOIN dual d3;
What is returned upon execution?

A. an error
B. 6 rows
C. 3 rows
D. 0 rows
E. 8 rows
F. 1 row

正解：F

解説：
The given query is using the CROSS JOIN clause, which produces a Cartesian product of the tables involved.
The DUAL table in Oracle is a special one-row, one-column table present by default in all Oracle database installations. When you cross join the DUAL table with itself multiple times without any where clause to limit the rows, the result is a multiplication of the row count for each cross-joined instance.
Since DUAL has a single row, cross-joining it with itself any number of times will still result in a single row being returned. The SELECT 2 part of the query simply dictates that the number 2 will be the value in the column of this single row.
So, the result of this query will be one row with a single column containing the value 2.
References:
* Oracle Database SQL Language Reference 12c, especially sections on join operations and the DUAL table.

質問 # 300
Which three statements are true about dropping and unused columns in an Oracle database?

A. A column that is set to NNUSED still counts towards the limit of 1000 columns per table.
B. A primary key column referenced by another column as a foreign key can be dropped if using the CASCADE option.
C. Partition key columns cannot be dropped.
D. An UNUSED column's space is remained automatically when the block containing that column is next queried.
E. An UNUSED column's space is remained automatically when the row containing that column is next queried.
F. A DROP COLUMN command can be rolled back.

正解：A、B、C

質問 # 301
A non-correlated subquery can be defined as __________. (Choose the best answer.)

A. A set of one or more sequential queries in which generally the result of the inner query is used as the search value in the outer query.
B. A SELECT statement that can be embedded in a clause of another SELECT statement only.
C. A set of sequential queries, all of which must return values from the same table.
D. A set of sequential queries, all of which must always return a single value.

正解：A

質問 # 302
You issue this command which succeeds:
SQL> DROP TABLE products;
Which three statements are true?

A. Any uncommitted transaction in the session is committed.
B. All existing views and synonyms that refer to the table are invalidated but retained.
C. All the table's indexes if any exist, are invalidated but retained.
D. Table data and the table structure are deleted.
E. Table data is deleted but the table structure is retained.

正解：A、C、D

質問 # 303
Which three statements are true regarding subqueries?

A. Subqueries can contain ORDER BY but not the GROUP BY clause.
B. Main query and subquery can get data from different tables.
C. Multiple columns or expressions can be compared between the main query and subquery.
D. Subqueries can contain GROUP BY and ORDER BY clauses.
E. Main query and subquery must get data from the same tables.
F. Only one column or expression can be compared between the main query and subquery.

正解：B、C、D

解説：
Explanation
References:
http://docs.oracle.com/javadb/10.6.2.1/ref/rrefsqlj13658.html

質問 # 304
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