Databases Reference
In-Depth Information
A text plan can be useful to show more details about both the Stream Aggregate and the
Compute Scalar operators, so you should also run the query in Listing 2-16.
SET
SHOWPLAN_TEXT
ON
GO
SELECT
AVG
(
ListPrice
)
FROM
Production
.
Product
GO
SET
SHOWPLAN_TEXT
OFF
GO
Listing 2-16.
The displayed text plan is:
|--Compute Scalar(DEFINE:([Expr1003]=CASE WHEN [Expr1004]=(0) THEN NULL ELSE
[Expr1005]/CONVERT_IMPLICIT(money,[Expr1004],0) END))
|--Stream Aggregate(DEFINE:([Expr1004]=Count(*), [Expr1005]=SUM([Product].
[ListPrice])))
|--Clustered Index Scan(OBJECT:([Product].[PK_Product_ProductID]))
The same information could be obtained from the graphical plan by selecting the
Properties
window (by pressing F4) of both the Stream Aggregate and Compute Scalar
operators, and expanding the
Defined Values
property as shown in Figure 2-13.
