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最新的 Oracle PL/SQL Developer Certified Associate 1z1-071 免費考試真題 (Q403-Q408):

問題 #403
Examine the description of the CUSTOMERS table:

Which two statements will do an implicit conversion?

A. SELECT FROM + customers WHERE insert_date = DATE '2019-01-01';
B. SELECT FROM + customers WHERE (customer_id) = 0001;
C. SELECT FROM + customers WHERE (customer_id) = '0001';
D. SELECT FROM + customers WHERE insert_date = '01-JAN-19';
E. SELECT FROM + customers WHERE TO-CHAR (customer_id) = '0001';

答案：B,D

問題 #404
View the exhibit and examine the structure and data in the INVOICE table.

Which two SQL statements would execute successfully? (Choose two.)

A. SELECT MAX(AVG(SYSDATE -inv_date))
FROM invoice
B. SELECT AVG( inv_date -SYSDATE), AVG(inv_amt)
FROM invoice
C. SELECT AVG(inv_date)
FROM invoice
D. SELECT MAX(inv_date), MIN(cust_id)
FROM invoice

答案：B,D

問題 #405
Evaluate the following query:
SQL> SELECT TRUNC(ROUND(156.00, -1), -1)
FROM DUAL;
What would be the outcome?

A. 0
B. 1
C. 2
D. 3
E. 4

答案：C

解題說明：
Function Purpose
ROUND(column|expression, n) Rounds the column, expression, or value to n decimal places or, if n is omitted, no decimal places (If n is negative, numbers to the left of decimal point are rounded.) TRUNC(column|expression, n) Truncates the column, expression, or value to n decimal places or, if n is omitted, n defaults to zero

問題 #406
Which two are true about dropping columns from a table?

A. A column must be set as unused before it is dropped from a table.
B. A column can be removed only if it contains no data.
C. A primary key column cannot be dropped.
D. A column that is referenced by another column in any other table cannot be dropped.
E. Multiple columns can be dropped simultaneously using the ALTER TABLE command.
F. A column drop is implicitly committed.

答案：D,E,F

問題 #407
Which three statements are true?

A. The DEPTNO column in the EMP table can contain the value 1.
B. The SALARY column must have a value .
C. The COMMISSION column can contain negative values .
D. The DEPTNO column in the EMP table can contain NULLS .
E. The MANAGER column is a foreign key referencing the EMPNO column.
F. The DNAME column has a unique constraint.
G. An index is created automatically in the MANAGER column.

答案：B,C,D

問題 #408
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