select Avg(Rent) [Average Rent] from Inventory in VS .NET

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select Avg(Rent) [Average Rent] from Inventory
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As you can see, SQL Server will even print a warning about nulls:
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Average Rent -----------200.0000
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5: Functions
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(1 row(s) affected) Warning: Null value eliminated from aggregate.
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You apply Count() on a specific field:
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select Count(Rent) [Rentals] from Inventory
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SQL Server will count only records that do not have null in the Rent field:
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Rentals -----------241 (1 row(s) affected) Warning: Null value eliminated from aggregate.
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You can apply Count() on all fields:
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select Count(*) [Assets] from Inventory
SQL Server counts all records in the table:
Assets -----------7298 (1 row(s) affected)
Rowset Functions
Functions of this type are distinguished from other functions in that they return a complete recordset to the caller. They cannot be used (as is the case for scalar functions) in any place where an expression is acceptable. They can be used in Transact-SQL statements only in situations where the server expects a table reference. An example of such a situation is the From clause of the Select statement. The OpenQuery() function is designed to return a recordset from a linked server. It can be used as a part of Select, Update, Insert, and Delete Transact-SQL statements. The Query parameter must contain a valid SQL query in the dialect of the linked server, since the query will be executed (as-is as a pass-through query) on the linked server. This function uses the following syntax:
OpenQuery(linked_server, 'query')
SQL Server 2000 Stored Procedure & XML Programming
NOTE
Linked servers are OLE DB data sources that are registered on the local SQL server. After registration, the local server knows how to access data on the remote server. All that is needed in your code is a reference to the name of the linked server.
You can register a linked server to be associated with the Northwind.mdb sample database either from Enterprise Manager or using the following code:
EXEC sp_addlinkedserver @server = 'Northwind_Access', @provider = 'Microsoft.Jest.OLEDB.4.0', @srvproduct = 'OLE DB Provider for Jet', @datasrc = 'c:\program files\Microsoft ' + 'Office2000\Office\Samples\northwind.mdb' Go
Then, you can use the OpenQuery() function to return records from the linked server:
SELECT * FROM OpenQuery(Northwind_Access, 'SELECT * FROM Orders')
OpenRowSet() is very similar to the OpenQuery() function:
OpenRowset( 'provider_name', {'datasource';'user_id';'password' | 'provider_string' }, { [catalog.][schema.]object | 'query'} )
It is designed for connecting to a server that is not registered as a linked server. Therefore, you must supply both the connection parameters and the query in order to use it. There are several options for defining the connection, such as OLE DB, ODBC, and OLE DB for ODBC, along with two options for specifying a result set: a pass-through query or a valid name for a database object. The following query joins one table from the remote SQL server with two tables on the local SQL server:
SELECT a.au_lname, a.au_fname, titles.title FROM OpenRowset('MSDASQL', 'DRIVER={SQLServer};SERVER=Toronto;UID=sa;PWD=pwd', pubs.dbo.authors) AS a INNER JOIN titleauthor
5: Functions
ON a.au_id = titleauthor.au_id INNER JOIN titles ON titleauthor.title_id = titles.title_id
The OpenDataSource() function is more similar to OpenRowset() than to OpenQuery(). It allows the caller to specify connection parameters inside the four-part database object name. It can be used in T-SQL in every position where a linked server can be used. The following example joins tables on the local server with tables on the remote server:
SELECT a.au_lname, a.au_fname, titles.title FROM OpenDataSource('SQLOLDB', 'DataSource=Toronto;User ID=sa; Password=pwd).pubs.dbo.authors as a INNER JOIN titleauthor ON a.au_id = titleauthor.au_id INNER JOIN titles ON titleauthor.title_id = titles.title_id
Although OpenRowset() and OpenDataSource() will work fine, if you plan repetitive use of some data source, you should consider registering a linked server and using OpenQuery(). The execution of OpenQuery() will be considerably faster.
Depending on the features of the OLE DB provider, you can also use these functions to delete, update, or insert information on other servers.
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CHAPTER
Composite Transact-SQL Constructs: Batches, Scripts, and Transactions
IN THIS CHAPTER:
Batches Scripts Transactions
SQL Server 2000 Stored Procedure & XML Programming
ransact-SQL statements can be grouped and executed together in a variety of ways. They can be
Compiled as a part of a stored procedure, user-defined function, or trigger Written and executed individually or in groups from client utilities in the form of batches Grouped and stored in external script files that can be opened and executed from various client utilities Grouped in transactions that succeed completely or fail completely
This chapter discusses batches, scripts, and transactions. It is not necessary to run examples from the text against the Asset database, but if you do, you must first make sure that the database contains the following table by executing the following script against the Asset database:
Create Table Part(PartId int identity, Make varchar(50), Model varchar(50), Type varchar(50))
This table is used to illustrate the concepts discussed in this chapter. Some of the changes are destructive, so existing tables such as Equipment will not be used, which may be needed for other purposes later.
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