Question

I have a stored procedure that is working well, it’s a select query. I want to change what is returned though with some aggregations, using the current query as a subquery. The current query returns data as such:

A  1/1/12
A  1/2/12
A  1/3/12
B  2/1/12
B  5/3/12
B  5/5/12

I’d like to see this as:

A  1/1/12  1/3/12
B  2/1/12  5/5/12

So I want the min of the date value, then the max of the date value, per stock symbol. Here is the current sproc that I’d like to stick with:

ALTER PROCEDURE dbo.sprocSymbsDatesForHistoricalPricingVol

AS

DECLARE @NxtAvailableDataDownloadDate date

SET @NxtAvailableDataDownloadDate = dbo.NextAvailableDataDownloadDate()

SELECT Symbol, TradingDate
FROM (SELECT tblSymbolsMain.Symbol, tblTradingDays.TradingDate
      FROM tblSymbolsMain CROSS JOIN
      tblTradingDays
      WHERE (tblTradingDays.TradingDate <= @NxtAvailableDataDownloadDate)) AS T1
      WHERE (NOT EXISTS
             (SELECT TradeDate, Symbol
              FROM tblDailyPricingAndVol
              WHERE (TradeDate = T1.TradingDate) AND (Symbol = T1.Symbol)))
ORDER BY Symbol, TradingDate

My attempts to wrap that select query as a subquery aren’t working… any takers? I’m sure it’s quite simple. Thanks in advance…

Answer 1

SELECT Symbol, MIN(TradingDate), Max(TradingDate)
FROM (
SELECT Symbol, TradingDate
FROM (SELECT tblSymbolsMain.Symbol, tblTradingDays.TradingDate
      FROM tblSymbolsMain CROSS JOIN
      tblTradingDays
      WHERE (tblTradingDays.TradingDate <= @NxtAvailableDataDownloadDate)) AS T1
      WHERE (NOT EXISTS
             (SELECT TradeDate, Symbol
              FROM tblDailyPricingAndVol
              WHERE (TradeDate = T1.TradingDate) AND (Symbol = T1.Symbol)))) t
GROUP BY Symbol