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Which three are true about dropping columns from a table?
A. A column can be removed only if it contains no data.
B. A primary key column cannot be dropped.
C. A column drop is implicitly committed
D. A column must be set as unused before it is dropped from a table.
E. A column that is referenced by another column in any other table cannot be dropped.
F. Multiple columns can be dropped simultaneously using the ALTER TABLE command.
Answer: C,E,F
NEW QUESTION # 234
View the Exhibit and examine the structure of the ORDER_ITEMS table.
You must select the ORDER_ID of the order that has the highest total value among all the orders in the ORDER_ITEMS table.
Which query would produce the desired result?
A. SELECT order_id
FROM order_items
WHERE(unit_price*quantity) = MAX(unit_price*quantity)
GROUP BY order_id);
B. SELECT order_id
FROM order_items
WHERE (unit_price*quantity) = (SELECT MAX(unit_price*quantity)
FROM order_items
GROUP BY order_id)
C. SELECT order_id
FROM order_items
GROUP BY order_id
HAVING SUM(unit_price*quantity) = (SELECT MAX (SUM(unit_price*quantity)) FROM order_items GROUP BY order_id);
D. SELECT order_id
FROM order_items
WHERE(unit_price*quantity) = (SELECT MAX (SUM(unit_price*quantity)
FROM order_items) GROUP BY order_id);
Answer: C
NEW QUESTION # 235
You must write a query that prompts users for column names and conditions every time it is executed.
The user must be prompted only once for the table name.
Which statement achieves those objectives?
A. SELECT &col1, &col2
FROM &&table
WHERE &condition = &&cond
B. SELECT &col1, &col2
FROM "&table"
WHERE &condition = &cond;
C. SELECT &col1, &col2
FROM &&table
WHERE &condition = &cond;
D. SELECT &col1, '&col2'
FROM &table
WHERE &&condition = '&cond';
Answer: C
Explanation:
Explanation/Reference:
NEW QUESTION # 236
Which two statements are true about the DUAL table?
A. It can be accessed only by the SYS user.
B. It can be used to display only constants or pseudo columns.
C. It can display multiple rows but only a single column.
D. It can display multiple rows and columns.
E. It can be accessed by any user who has the SELECT privilege in any schema
F. It consists of a single row and single column of VARCHAR2 data type.
Answer: E,F
Explanation:
A . Incorrect. DUAL consists of a single row and column. B. Incorrect. DUAL is a special one-row, one-column table present by default in all Oracle database installations and can be accessed by any user with SELECT privilege. C. Correct. Any user with the SELECT privilege can select from the DUAL table. It is a dummy table used primarily for selecting a constant, pseudocolumn, or expression not involving any tables. D. Incorrect. DUAL has only one row and one column. E. Correct. The DUAL table has a single VARCHAR2 column called DUMMY, which has a value of 'X'. F. Incorrect. DUAL can be used for a variety of purposes, such as selecting system constants, user environment variables, expressions, and sequences.
This information is detailed in the Oracle Database SQL Language Reference, which describes the properties and uses of the DUAL table.
NEW QUESTION # 237
View the Exhibit and examine the data in EMP and DEPT tables.
In the DEPT table, DEPTNO is the PRIMARY KEY.
In the EMP table, EMPNO is the PRIMARY KEY and DEPTNO is the FOREIGN KEY referencing the DEPTNO column in the DEPT table.
What would be the outcome of the following statements executed in the given sequence?
DROP TABLE emp;
FLASHBACK TABLE emp TO BEFORE DROP;
INSERT INTO emp VALUES (2, 'SCOTT', 10);
INSERT INTO emp VALUES (3, 'KING', 55);
A. Both the INSERT statements would fail because the constraints are automatically retrieved when the table is flashed back.
B. Only the SECOND INSERT statement would succeed because all the constraints except referential integrity constraints that reference other tables are retrieved automatically after the table is flashed back.
C. Only the first INSERT statement would succeed because all constraints except the primary key constraint are automatically retrieved after a table is flashed back.
D. Both the INSERT statements would succeed because none of the constraints on the table are automatically retrieved when the table is flashed back.
Answer: B
NEW QUESTION # 238
......
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