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Microsoft SQL Server Interview Questions and Answers



You wish to configure event logging for your SQL Server 2005 Notification Services instance. Where would you make this change?
Edit the nsservice.exe.config file in the C:\Program Files\Microsoft SQL Server\90\NotificationServices\n.n.nnn\bin folder.
Event logging and most Notification Services configuration require editing an XML file. In this case, the NSservice.exe.config file is edited to set the appropriate editing level.

Which of the following is not true about the Raw File Destintion connection in SQL Server 2005 Integration Services?
It supports BLOB object data.
The Raw File Destination connection does not use a connection manager, supports NULL data, and only has one input. It also does not support BLOB data or have an error output.

What message types exist in SQL Server 2005 Service Broker?
These are defined for each contract.
Each application that sets up queues and contracts inside Service Broker must define the message types that are valid for the contract.

What does the CEILING() function do?
Returns the smallest integer greater than or equal to the value passed in.
CEILING() returns the smallest integer that is great than or equal to the value passed in.

What is a dialog conversation in the SQL Server 2005 Service Broker.
A dialog conversation is a conversation between services.
A dialog conversation is a conversation between services. A conversation includes messages being passed back and forth as part of a contract.

What is row versioning in SQL Server 2005?
Row versioning keeps a copy of each row for use by applications or transactions to prevent readers from being blocked by writers.
Row versioning is a method whereby the database engine keeps a copy of a row's data as it existed before the start of a transaction for queries to read this data and reduce locking contention if they are configured.

What does @@MAX_PRECISION return?
The maximum precision for numeric and decimal data.
This function returns the maximum precision for numeric and decimal data as set on the server. The default for SQL Server 2005 is 38.

Which of the following columns can be indexed with SQL Server 2005 Full-Text Search?
char, varchar, nvarchar, and varbinary, text, ntext, and image
All character columns, char, varchar and nvarchar columns including max, text and ntext, and image columns are valid for full-text searching.

When starting SQL Server 2005 from the command line, what does the -h switch do?
This switch reserves memory space for Hot-Add memory metadata, available with AWE enabled.
This switch is used with 32-bit SQL Server and AWE to reserve memory to reserve memory space for Hot-Add memory metadata.

Janice has two tables, Employees and Orders. She has been asked to provide a report of the number of orders processed by each employee in the month of June. If an employee didn’t process any orders, the report should reflect the employee’s name and a zero for the number of orders. Which of the queries is the best one for Janice to use to return the information she has been requested to provide?
SELECT
E.LastName + ', ' + E.FirstName AS [Employee Name]
, ISNULL(O.[# of Orders], 0) [# of Orders]
FROM dbo.Employees E
LEFT JOIN (SELECT
EmployeeID
, COUNT(*) [# of Orders]
FROM dbo.Orders
WHERE OrderDate >= '20060601'
AND OrderDate < '20060701'

GROUP BY EmployeeID) O
ON E.EmployeeID = O.EmployeeID
ORDER BY [Employee Name]

While it would seem BETWEEN would save Janice a bit of typing, there is a problem with it. BETWEEN corresponds, based on these queries to the same as:

WHERE OrderDate >= ‘20060601’ AND OrderDat e<= ‘20060701’
It’s the latter one that causes the query to be incorrect as it would potentially include orders placed on July 1st at midnight (20060701 corresponds to July 1, 2006 at 00:00:00). While this would be unlikely in a small retail environment, it is entirely possible in larger operations, especially those which are international in scope. Therefore, the use of BETWEEN in this case is not appropriate.
With respect to the GROUP BY, it must appear in the subquery on the Orders table, as given in the answer. When it occurs after the LEFT JOIN, the rows where there is an employee but no order for the month will be lost. Since Janice must report on employees who had no sales, this is unacceptable.

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