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Returns the number of microseconds per tick. Returns the number of read/write errors since SQL Server was started. Returns the number of disc reads without cache reads by SQL Server since it was started. Returns the number of disc writes by SQL Server since it was started.
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Aggregate Functions
These functions perform an operation on a set of fields and return a single value. Their use is relatively limited. They can be used in the following situations:
w s v
The selection list of the Select statement A Having clause A Compute clause
Description
Function
AVG( [ALL | DISTINCT] expression) COUNT( [ALL | DISTINCT] expression |*) COUNT_BIG( [ALL | DISTINCT] expression |*)
Returns the average value in the group. Counts the number of items in the group. Counts the number of items in the group. The result is returned in the form of a bigint number. This function is available only in SQL Server 2000.
5:
Functions
Function
GROUPING(Column_Name)
Description
Creates an additional column with a value of 1 when a row is added by the CUBE or ROLLUP operator or 0 if it is not the result of a CUBE or ROLLUP operator. Returns the maximum value in the expression. Returns the minimum value in the expression. Returns the sum of the expression s values. Returns the statistical standard deviation for the values in the expression. Returns the statistical standard deviation for the population for the values in the expression. Returns the statistical variance of the values in the expression. Returns the statistical variance for the population for the values in the expression.
MAX(expression)
MIN (expression)
SUM(expression)
STDEV(expression)
STDEVP(expression)
VAR(expression)
VARP(expression)
Except for the COUNT function, all aggregate functions remove records that have null in the specified field from the set.
select AVG(Rent) [Average Rent] from Inventory
As you can see, SQL Server will even print a warning about nulls:
Average Rent ------------
SQL Server 2000 Stored Procedure Programming
200.0000 (1 row(s) affected) Warning: Null value eliminated from aggregate.
You apply COUNT on a specific field:
select COUNT(Rent) [Rentals] from Inventory
SQL Server will count only records that do not have null in the Rent field:
Rentals -----------241 (1 row(s) affected) Warning: Null value eliminated from aggregate.
You can apply COUNT on all fields:
select COUNT(*) [Assets] from Inventory
SQL Server counts all records in the table:
Assets -----------7298 (1 row(s) affected)
Rowset Functions
Functions from this set are unusual in that they return a complete recordset to the caller. They cannot be used (as 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. These functions were introduced in Microsoft SQL Server 7.0.
5:
Functions
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')
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'} )
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