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試験科目:Oracle Database 12c: Advanced Administration
最近更新時間:2017-02-13
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試験科目:Oracle Database 12c: SQL Fundamentals
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NO.1 Which two statements are true regarding the USING and ON clauses in table joins? (Choose
two.)
A. The WHERE clause can be used to apply additional conditions in SELECT statement containing the
ON or the USING clause
B. The ON clause can be used to join tables on columns that have different names but compatible
data types
C. Both USING and ON clause can be used for equijoins and nonequijoins
D. A maximum of one pair of columns can be joined between two tables using the ON clause
Answer: A,B

1z1-061 市販本   1z1-061 参考書   
Explanation:
Creating Joins with the USING Clause
If several columns have the same names but the data types do not match, use the USING clause to
specify the columns for the equijoin. Use the USING clause to match only one column when more
than one column matches. The NATURAL JOIN and USING clauses are mutually exclusive Using Table
Aliases with the USING clause When joining with the USING clause, you cannot qualify a column that
is used in the USING
clause itself. Furthermore, if that column is used anywhere in the SQL statement, you cannot alias it.
For example, in the query mentioned in the slide, you should not alias the location_id column in the
WHERE clause because the column is used in the USING clause.
The columns that are referenced in the USING clause should not have a qualifier (table name oralias)
anywhere in the SQL statement. Creating Joins with the ON Clause The join condition for the natural
join is basically an equijoin of all columns with the same name. Use the ON clause to specify arbitrary
conditions or specify columns to join. - ANSWER C The join condition is separated from other search
conditions. ANSWER D The ON clause makes code easy to understand.

NO.2 View the Exhibit and examine the structure of the PRODUCTS table.
Which two tasks would require subqueries? (Choose two.)
A. Display the total number of products supplied by supplier 102 and have product status as
'obsolete'.
B. Display the minimum list price for each product status.
C. Display the number of products whose list price is more than the average list price.
D. Display all suppliers whose list price is less than 1000.
E. Display all products whose minimum list price is more than the average list price of products and
have the status 'orderable'.
Answer: C,E

1z1-061 返済   

NO.3 Which two statements are true about sequences created in a single instance database? (Choose
two.)
A. When a database instance shuts down abnormally, the sequence numbers that have been cached
but not used would be available once again when the database instance is restarted
B. CURRVAL is used to refer to the last sequence number that has been generated
C. The numbers generated by a sequence can be used only for one table
D. When the MAXVALUE limit for a sequence is reached, you can increase the MAXVALUE limit by
using the ALTER SEQUENCE statement
E. DELETE <sequencename> would remove a sequence from the database
Answer: B,D

1z1-061 英語版   
Explanation:
Gaps in the Sequence
Although sequence generators issue sequential numbers without gaps, this action occurs
independent of a commit or rollback. Therefore, if you roll back a statement containing a sequence,
the number is lost.
Another event that can cause gaps in the sequence is a system crash. If the sequence caches values in
memory, those values are lost if the system crashes.
Because sequences are not tied directly to tables, the same sequence can be used for multiple tables.
However, if you do so, each table can contain gaps in the sequential numbers.
Modifying a Sequence
If you reach the MAXVALUE limit for your sequence, no additional values from the sequence are
allocated and you will receive an error indicating that the sequence exceeds the MAXVALUE. To
continue to use the sequence, you can modify it by using the ALTER SEQUENCE statement
To remove a sequence, use the DROP statement:
DROP SEQUENCE dept_deptid_seq;

NO.4 Which is an iSQL*Plus command?
A. DELETE
B. INSERT
C. RENAME
D. DESCRIBE
E. SELECT
F. UPDATE
Answer: D

1z1-061 リンクグローバル   
Explanation:
The only SQL*Plus command in this list: DESCRIBE. It cannot be used as SQL command. This
command returns a description of tablename, including all columns in that table, the datatype for
each column and an indication of whether the column permits storage of NULL values.
Incorrect answer:
A . INSERT is not a SQL*PLUS command
B . UPDATE is not a SQL*PLUS command
C . SELECT is not a SQL*PLUS command
E . DELETE is not a SQL*PLUS command
F . RENAME is not a SQL*PLUS command
Refer: Introduction to Oracle9i: SQL, Oracle University Study Guide, 7