Question

I have a report that tracks how long certain items have been in the database, and does so by tracking it over a series of age ranges (20-44, 45-60, 61-90, 91-180, 180+). I have the following query as the data source of the report:

SELECT DISTINCT Source.ItemName, 
Count(SELECT Source.DateAdded FROM Source WHERE Int(Date()-Source.DateAdded) > 20) AS Total, 
Count(SELECT Source.DateAdded FROM Source WHERE Int(Date()-Source.DateAdded) BETWEEN 20 AND 44) AS BTWN_20_44, 
Count(SELECT Source.DateAdded FROM Source WHERE Int(Date()-Source.DateAdded) BETWEEN 45 AND 60) AS BTWN_45_60, 
Count(SELECT Source.DateAdded FROM Source WHERE Int(Date()-Source.DateAdded) BETWEEN 61 AND 90) AS BTWN_61_90, 
Count(SELECT Source.DateAdded FROM Source WHERE Int(Date()-Source.DateAdded) BETWEEN 91 AND 180) AS BTWN_91_180, 
Count(SELECT Source.DateAdded FROM Source WHERE Int(Date()-Source.DateAdded) > 180) AS GT_180
FROM Source
GROUP BY Source.ItemName;

This query works great, except if there aren’t any entries a column. Instead of returning a count of 0, an empty value is returned.

How do I get Count() to return a 0 instead of empty?

Answer 1

Replace the Count statements with

Sum(Iif(DateDiff("d",DateAdded,Date())>=91,Iif(DateDiff("d",DateAdded,Date())<=180,'1','0'),'0')) AS BTWN_91_180,

I’m not a fan of the nested Iifs, but it doesn’t look like there’s any way around them, since DateDiff and BETWEEN...AND were not playing nicely.

To prune ItemNames without any added dates, the query block had to be enclosed in a larger query, since checking against a calculated field cannot be done from inside a query. The end result is this query:

SELECT *
FROM 
     (
     SELECT DISTINCT Source.ItemName AS InvestmentManager, 
     Sum(Iif(DateDiff("d",DateAdded,Date())>=20,Iif(DateDiff("d",DateAdded,Date())<=44,'1','0'),'0')) AS BTWN_20_44,
     Sum(Iif(DateDiff("d",DateAdded,Date())>=45,Iif(DateDiff("d",DateAdded,Date())<=60,'1','0'),'0')) AS BTWN_45_60,
     Sum(Iif(DateDiff("d",DateAdded,Date())>=61,Iif(DateDiff("d",DateAdded,Date())<=90,'1','0'),'0')) AS BTWN_61_90,
     Sum(Iif(DateDiff("d",DateAdded,Date())>=91,Iif(DateDiff("d",DateAdded,Date())<=180,'1','0'),'0')) AS BTWN_91_180,
     Sum(Iif(DateDiff("d",DateAdded,Date())>180,'1','0')) AS GT_180,
     Sum(Iif(DateDiff("d",DateAdded,Date())>=20,'1','0')) AS Total
     FROM Source
     WHERE CompleteState='FAILED'
     GROUP BY ItemName
     )
WHERE Total > 0;