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NEW QUESTION: 1
James works as a Database Designer for AccessSoft Inc. The company has a Windows Vista computer, which has a database named Orders. The database contains a table named OrderDetails. Users run queries against the database to place orders of customers. They also retrieve data related to the processing of orders and information about the customers who place orders. Users complain that the retrieval of data is very slow. James opens the following query:
SELECT * FROM OrderDetails;
What should he do to enhance the performance of the query?
A. Use the TOP clause with the SELECT statement.
B. Use the DISTINCT clause with the SELECT statement.
C. Use the GROUP BY clause with the SELECT statement.
D. Use the WHERE clause with the SELECT statement.
Answer: D
Explanation:
In order to enhance the performance of the query, James will use the WHERE clause with the SELECT statement as follows:
SELECT * FROM OrderDetails WHERE custname='customer name';
The WHERE clause is used to filter data given in the table. The filter is based on one or more columns given after the SELECT statement. The columns are separated by commas.
Answer option C is incorrect. The DISTINCT clause is used to prevent rows from getting duplicated in the result set. It can only be used with the SQL SELECT statement.
The syntax for the DISTINCT clause is as follows:
SELECT DISTINCT <columns>
FROM <table_name>
WHERE <conditions>
Answer option B is incorrect. The TOP clause is used to retrieve data for the first set of rows. The example is as follows:
SELECT * TOP 10 FROM OrderDetails;
The statement will retrieve only the top ten rows from the OrderDetails table.
Answer option D is incorrect. The GROUP BY clause groups selected rows on the basis of values of specified column(s) for each row, and returns a single row of summary information for each group. Rows that have the same values in the specified grouping column(s) are grouped together. The GROUP BY clause suppresses duplicate rows for the grouping column(s). It does not guarantee the order of the result set. Therefore, the ORDER BY clause should be used with the GROUP BY clause to sort the result set in the desired order. The syntax of the GROUP BY clause is given below:
SELECT column_name, aggregate_function(column_name) FROM table_name WHERE column_name operator value GROUP BY column_name Consider the following example, EMPLOYEE_EXPENSES table:
P_ID
LastName
Expenses
1
Harry
1000
2
Steve
400
3
Harry
2000
To group the total sum (total order) of each employee from the EMPLOYEE_EXPENSES table, run the following command:
SELECT LastName, Expenses FROM Orders GROUP BY LastName
The output of the command will appear as:
LastName
Expenses
Harry
3000
Steve
400
Chapter: DATABASE, ADVANCED-LEVEL
Objective: Query Design
NEW QUESTION: 2
If Jessica only spent 20% instead of the 25% allotment for food in May of 2001, how much did she save?
A. $148.32
B. $131.10
C. $152.22
D. $153.33
E. $144.30
Answer: B
NEW QUESTION: 3
In a resource-restricted security program, which of the following approaches will provide the BEST use of the limited resources?
A. Risk avoidance
B. Risk prioritization
C. Threat management
D. Cross-training
Answer: B
NEW QUESTION: 4
A. Option C
B. Option A
C. Option B
D. Option D
Answer: A
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