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NO.1 A MySQL table has ...
Select the best response.
A. zero or more
columns, and zero or more rows.
B. zero or more columns, and one or more
rows.
C. one or more columns, and zero or more rows.
D. one or more
columns, and one or more rows.
Answer: C
NO.2 Which of the following
statements can be used to list all databases that are accessible to the
current
user?
Select the best response.
A. LIST DATABASES
B. SHOW
DATABASES
C. DISPLAY DATABASES
D. VIEW DATABASES
Answer: B
NO.3
A table is successfully created by executing the following statement:
CREATE
TABLE numbers (
double_number double,
decimal_number
decimal(2,1)
)
One row is successfully inserted into the numbers table. At
this point, the table contains the
following
data:
+---------------+----------------+
| double_number |
decimal_number |
+---------------+----------------+
| 1.5 | 2.5
|
+---------------+----------------+
The row is updated by executing the
following statement:
UPDATE numbers
SET double_number = double_number +
0.25,
decimal_number = decimal_number + 0.01
Which values are now stored
in the double_number and decimal_number columns of the updated row?
Select
the best response.
A. 1.8 and 2.5
B. 1.75 and 2.5
C. 1.8 and 2.51
D.
1.75 and 2.51
Answer: B
NO.4 Which part of a SELECT statement
specifies the tables from which data is to be retrieved?
Select the best
response.
A. The SELECT list.
B. The FROM clause.
C. The WHERE
clause.
D. The LIMIT clause.
Answer: B
NO.5 Which of the following
statements best describes the purpose of the SQL WHERE clause?
In SQL
statements, the WHERE clause specifies ...
Select the best response.
A.
the tables from which data is to be retrieved.
B. a condition to filter for
only specific rows.
C. a condition to filter for only specific groups defined
by a GROUP BY clause.
D. a number to limit the number of rows that is
operated upon by the statement.
Answer: B
NO.6 Which statement can be
used to list all columns in the City table?
Select the best response.
A.
DISPLAY COLUMNS FROM City
B. SHOW COLUMNS FROM City
C. SHOW COLUMNS LIKE
'City'
D. SHOW City COLUMNS
Answer: B
NO.7 The table Country
contains the following rows:
+--------------------------+------------+
|
Name | Population |
+--------------------------+------------+
| Nauru |
12000 |
| Turks and Caicos Islands | 17000 |
| Tuvalu | 12000 |
|
Wallis and Futuna | 15000
|
+--------------------------+------------+
Which of the following
statements will return all rows in the table, sorted by the value in the
Population
column?
Select the best response.
A. SELECT Name, Population
ASC
FROM Country
B. SELECT Name, ORDER BY Population
FROM Country
C.
SELECT Name, Population
FROM Country
GROUP BY Population ASC
D. SELECT
Name, Population
FROM Country
ORDER BY Population
Answer: D
NO.8
Which of the following statements will discard the existing database called
world?
Select the best response.
A. DELETE DATABASE world
B. DROP
DATABASE world
C. REMOVE DATABASE world
D. TRUNCATE DATABASE
world
Answer: B