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最新的 9i DBA 1Z0-007 免費考試真題:
1. In which two cases would you use an outer join? (Choose two.)
A) The tables being joined have NOT NULL columns.
B) The tables being joined have both matched and unmatched data.
C) The tables being joined have only matched data.
D) The tables being joined have only unmatched data.
E) The columns being joined have NULL values.
F) Only when the tables have a primary key/foreign key relationship.
2. A SELECT statement can be used to perform these three functions:
1.Choose rows from a table.
2.Choose columns from a table
3.Bring together data that is stored in different tables by creating a link between them.
Which set of keywords describes these capabilities?
A) difference, projection, join
B) difference, projection, product
C) selection, intersection, join
D) selection, projection, join
E) intersection, projection, join
3. You want to display the titles of books that meet these criteria:
1.Purchased before January 21, 2001
2.Price is less then $500 or greater than $900
You want to sort the results by their data of purchase, starting with the most recently
bought book.
Which statement should you use?
A) SELECT book_title
FROM books
WHERE price IN (500,900)
AND purchase_date < '21-JAN-2001'
ORDER BY purchase date ASC;
B) SELECT book_title
FROM books
WHERE price < 500 or > 900
AND purchase_date < '21-JAN-2001'
ORDER BY purchase date DESC;
C) SELECT book_title
FROM books
WHERE (price < 500 OR price > 900)
AND purchase_date < '21-JAN-2001'
ORDER BY purchase date DESC;
D) SELECT book_title
FROM books
WHERE price between 500 and 900
AND purchase_date < '21-JAN-2001'
ORDER BY purchase_date;
4. The EMPLOYEES table contains these columns:
EMPLOYEE_ID NUMBER(4)
ENAME VARCHAR2 (25)
JOB_ID VARCHAR2(10)
Which SQL statement will return the ENAME, length of the ENAME, and the numeric position of the letter "a" in the ENAME column, for those employees whose ENAME ends with a the letter "n"?
A) SELECT ENAME, LENGTH(ENAME), INSTR(ENAME, 'a') FROM EMPLOYEES WHERE SUBSTR(ENAME, -1, 1) = 'n';
B) SELECT ENAME, LENGTH(ENAME), SUBSTR(ENAME, -1,1) FROM EMPLOYEES WHERE INSTR(ENAME, -1, 1) = 'n';
C) SELECT ENAME, LENGTH(ENAME), SUBSTR(ENAME, -1,1) FROM EMPLOYEES WHERE INSTR(ENAME, 1, 1) = 'n';
D) SELECT ENAME, LENGTH(ENAME), INSTR(ENAME, ,-1,1) FROM EMPLOYEES WHERE SUBSTR(ENAME, -1, 1) = 'n';
5. Which SELECT statement should you use to extract the year from the system date and display it in the format "1998"?
A) SELECT TO_DATE(SYSDATE,'yyyy') FROM dual;
B) SELECT TO_CHAR(SYSDATE,'yyyy') FROM dual;
C) SELECT DECODE(SUBSTR(SYSDATE, 8), 'YYYY') FROM dual;
D) SELECT DECODE(SUBSTR(SYSDATE, 8), 'year') FROM dual;
E) SELECT TO_CHAR(SUBSTR(SYSDATE, 8,2),'yyyy') FROM dual;
問題與答案:
問題 #1 答案: B,E | 問題 #2 答案: D | 問題 #3 答案: C | 問題 #4 答案: A | 問題 #5 答案: B |
220.128.97.* -
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