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最新的 Oracle PL/SQL Developer Certified Associate 1z0-071 免費考試真題 (Q45-Q50):

問題 #45
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
B. It ignores NULL values
C. Reversing the order of the intersected tables the result
D. The names of columns in all SELECT statements must be identical

答案：A

解題說明：
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.

問題 #46
Examine the description of the SALES1 table:

SALES2 is a table with the same description as SALES1.
Some sales data is duplicated in both tables.
You want to display the rows from the SALES1 table which are not present in the SALES2 table.
Which set operator generates the required output?

A. SUBTRACT
B. UNION ALL
C. UNION
D. MINUS
E. INTERSECT

答案：D

問題 #47
View the exhibit and examine the structure of the CUSTOMERS table.

Which two tasks would require subqueries or joins to be executed in a single statement?

A. listing of customers who do not have a credit limit and were born before 1980
B. finding the number of customers, in each city, who's marital status is 'married'.
C. listing of those customers, whose credit limit is the same as the credit limit of customers residing in the city 'Tokyo'.
D. finding the number of customers, in each city, whose credit limit is more than the average credit limit of all the customers
E. finding the average credit limit of male customers residing in 'Tokyo' or 'Sydney'

答案：C,D

問題 #48
Examine this query:
SELECT employee_id, first_name, salary
FROM employees
WHERE hiredate > 61*
Which two methods should yours to prevent prompting for hire date value when this queries executed?

A. Store the query in a script and pass the substitution value to the script when executing it.
B. Use the DEFINE command before executing the query
C. Execute the SET VERIFY ON command before executing the query.
D. Execute the SET VERIFY OFF command before executing the query.
E. Replace 's1' with &1'in the query:
F. Use the UNDEFINE command before executing the query.

答案：B,D

解題說明：
To prevent the prompting for a substitution variable value when executing a query:
* B. Execute the SET VERIFY OFF command before executing the query: This command turns off the substitution variable prompting, which means that SQL*Plus will not prompt for a value and will use whatever value is currently set for that variable.
* F. Use the DEFINE command before executing the query: By using the DEFINE command to set a value for the variable before the query execution, you ensure that SQL*Plus uses this predefined value instead of prompting for it.
References:
* Oracle SQL*Plus User's Guide and Reference, which discusses how to manage substitution variables.

問題 #49
Examine this partial statement:
SELECT ename, sal,comm FROM emp
Now examine this output:

WHICH ORDER BY clause will generate the displayed output?

A. ORDER BY NVL(comm,0) ASC NULLS LAST, ename
B. ORDER BY NVL(enam,0) DESC, ename
C. ORDER BY NVL(comm,0) ASC NULLS FIRST, ename
D. ORDER BY comm DESC NULLS LAST, ename

答案：C

解題說明：
The ORDER BY clause is used in a SELECT statement to sort the returned rows by one or more columns.
A . This clause would attempt to order by ename as if it were a numeric column, which is not correct since ename is not numeric.
B . This is the correct answer. The NVL function replaces nulls with the specified value, in this case, 0. This clause sorts by comm, with nulls considered as 0 and appearing first, followed by the actual values, and then sorts by ename.
C . This clause is incorrect because it would place null values at the end, but in the output, rows with null comm appear at the beginning.
D . This clause would sort the comm in descending order with the nulls at the end, which is not consistent with the output shown.
Reference:
Oracle Database SQL Language Reference, 12c Release 1 (12.1): "ORDER BY Clause" Oracle Database SQL Language Reference, 12c Release 1 (12.1): "NVL Function" Please note that the correct formatting of SQL statements and clauses is crucial for the successful execution of queries.

問題 #50
......

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1z0-071最新考證，1z0-071熱門認證

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最新的 Oracle PL/SQL Developer Certified Associate 1z0-071 免費考試真題 (Q45-Q50):

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