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NULLIF returns NULL if two expressions in the function return the same value. If the expressions are not equivalent, the function returns the value of the first expression. This function can be useful when calculating the average of columns with values that have special meaning. For example, let s assume that the author of the Asset database has created constraints or stored procedures such that a user can leave the value of the Inventory.Rent column as either null or zero (0) when equipment is not leased. In this case, the AVG function for calculating the average of the column will eliminate records containing null from the average but keep records with zero. It is not that the AVG function is implemented improperly, but that our design can be improved. It is possible to implement a workaround using the NULLIF function:

select AVG(Rent) "average without nulls", AVG(NULLIF(Rent, 0)) "average without nulls and zeros" from Inventory

An average calculated in this way will be different from an average calculated in the standard way:

average without nulls average without nulls and zeros --------------------- ------------------------------100.0000 (1 row(s) affected) Warning: Null value eliminated from aggregate. 150.0000

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When SQL Server 2000 was released, the W3C was still working on its XML Schema specification it was not even clear which variation would be adopted. Microsoft has implemented a variation of XML schema syntax called XML Data Reduced (XDR) in the MSXML parser (Microsoft XML Core Services) that was delivered initially as a part of Internet Explorer 5, and later in SQL Server 2000. Microsoft promised complete support for XML Schema when the W3C awarded it Recommended status, but before that could happen, more and more organizations started using XDR. It is also important to note that Microsoft uses XDR in BizTalk, one of the most significant initiatives in the Web Services market. It is an initiative intended to create e-commerce vocabularies for different vertical markets. At the time of this writing, SQL Server 2000 is using XDR schemas for several features, and support for XML Schema is increasing with each SQL Server 2000 Web Release. The following is an example of an XDR schema document:

The ISNULL function examines the check_expression. If its value is NULL, the function returns the replacement_value. If the value of the check_expression is not NULL, the function returns the check_expression. Let s suppose you want to calculate an average based on the total number of computers in the Inventory table. You can use the ISNULL value to replace NULL values during the calculation:

The average price of computers that counts nulls as zeroes is less than the average that ignores computers with the price set to NULL.

without nulls 100.0000 with nulls as zeros 75.0000 ------------------ ---------------------

NOTE: The name of this function is confusing, especially if you are a Visual Basic programmer as well. It cannot be used to test whether the value of an expression is null. You should use these operators instead:

If expression IS NULL If expression IS NOT NULL The COALESCE function is often used to coalesce (unite) values that are split into several columns. The result of the function is the first non-null expression. This function uses the following syntax:

COALESCE(expression [,...n])

<Schema name="Schema" xmlns="urn:schemas-microsoft-com:xml-data" xmlns:dt="urn:schemas-microsoft-com:datatypes"> <ElementType name="Inventory" content="empty" model="closed"> <AttributeType name="Inventoryid" dt:type="i4"/> <AttributeType name="EquipmentId" dt:type="i4"/> <AttributeType name="LocationId" dt:type="i4"/> <AttributeType name="StatusId" dt:type="ui1"/> <AttributeType name="LeaseId" dt:type="i4"/> <AttributeType name="LeaseScheduleId" dt:type="i4"/> <AttributeType name="OwnerId" dt:type="i4"/> <AttributeType name="Rent" dt:type="fixed.14.4"/> <AttributeType name="Lease" dt:type="fixed.14.4"/> <AttributeType name="Cost" dt:type="fixed.14.4"/> <AttributeType name="AcquisitionTypeID" dt:type="ui1"/> <attribute type="Inventoryid"/> <attribute type="EquipmentId"/> <attribute type="LocationId"/> <attribute type="StatusId"/> <attribute type="LeaseId"/> <attribute type="LeaseScheduleId"/> <attribute type="OwnerId"/> <attribute type="Rent"/> <attribute type="Lease"/> <attribute type="Cost"/> <attribute type="AcquisitionTypeID"/> </ElementType> </Schema>

In the following example, we coalesce (unite) values from three columns (Rent, Lease, and Cost) into one value (Acquisition Cost). Only one of those values in a single record is not null, and COALESCE will return it:

5:

you should choose to create a new installation of SQL Server. You will then be prompted for your name and company info, followed by the Licensing screen. After affirming your license agreement, you are presented with the Installation Definition dialog box, which is shown in Figure 1-2. This dialog box gives you the following choices:

SELECT Inventory.Inventoryid, Equipment.Make + ' ' + Equipment.Model Equipment, AcquisitionType.AcquisitionType, COALESCE(Inventory.Rent, Inventory.Lease, Inventory.Cost) [Cost] FROM Inventory INNER JOIN AcquisitionType ON Inventory.AcquisitionTypeID = AcquisitionType.AcquisitionTypeId INNER JOIN Equipment ON Inventory.EquipmentId = Equipment.EquipmentId

The result will contain just one column showing the cost of acquisition:

Inventoryid Equipment 5 6 8 10 Toshiba Portege 7020CT Toshiba Portege 7020CT Toshiba Portege 7020CT Toshiba Portege 7020CT AcquisitionType Cost Purchase Rent Lease Lease 1295.0000 200.0000 87.7500 99.9500 ----------- --------------------------------- -------------- ---------

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