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XLeratorDB/statistics Documentation

SQL Server COUNT function


 
Updated: 6 August 2010
Use COUNT_q to count the number of rows in a resultant table that contain numbers.
Syntax
SELECT [wctStatistics].[wct].[COUNT_q] (
   <@RangeQuery, nvarchar(4000),>)
Arguments
@RangeQuery
the select statement, as text, used to determine the values to be used in the COUNT_q calculation.
Return Types
float
Remarks
·         COUNT_q returns the number of rows in the resultant table than can be evaluated as numbers. Nulls, text, and any value that cannot be implicitly converted to float are excluded.
·         No GROUP BY is required for this function even though it produces aggregated results.
Examples
 
CREATE TABLE #c1(
      [num] [varchar] (10) NULL
)
insert into #c1 values (1.5)
insert into #c1 values (2.5)
insert into #c1 values (2.75)
insert into #c1 values (3.2)
insert into #c1 values (5.675)
insert into #c1 values ('wct')
 
select wct.count_q('SELECT num from #c1')
This produces the following result
-----------
5
 
(1 row(s) affected)


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