Question : Subqueries

Hi folks.

I am trying to write a stored procedure in SQL Server 2000 containing a subquery.

Lets say I am trying to get the manufacturer ID, the name of the car, a count of cars with that name and manufacturer listed between 2 dates, and a count of cars with that name and manufacturer before the later of the two dates.

I have written this so far:

CREATE PROCEDURE weeklySummary @StartDate datetime, @EndDate datetime
AS
SELECT Count(Cars.ID) AS Total, Cars.Name, Manufacturers.ID, (SELECT Count(ID) FROM Manufacturers INNER JOIN Cars ON Manufacturers.ID = Cars.Manufacturer WHERE Cars.DateAdded < @EndDate AND Cars.Name = !!!!!!!!!!!!!!!!!!!!!) AS RunningTotal
FROM Manufacturers INNER JOIN Cars ON Manufacturers.ID = Cars.Manufacturer
WHERE Cars.DateAdded > @StartDate AND Cars.DateAdded < @EndDate

Of course, to limit the number of rows counted in the subquery, I only need to count the records where the car name is the same as in the parent query (see the !!!!!!!!!!!!!!!!!!!!!).

Any ideas?  Can I even do this?

Thanks in advance,

DT

Answer : Subqueries

Hi DreadedTuesday,

 SELECT Count(Cars.ID) AS Total, Cars.Name, Manufacturers.ID, (SELECT
 Count(ID) FROM S_Manufacturers INNER JOIN S_Cars ON S_Manufacturers.ID =
 S_Cars.Manufacturer WHERE S_Cars.DateAdded < @EndDate AND S_Cars.Name = Cars.Name) AS RunningTotal

Etc, naming the aliases differently in the subquery allows you to use the parent alias in the where clause effectively and in the long run will avoid confusion when looking at it.


Tim Cottee