Question

I’m stuck on a sql server function, pasted below.. I’m trying to return a boolean (bit). I won’t bore you with the table schema description and nested udf functionality unless someone would like to see it, since when I test the two values I’m calculating individually, this works fine. I’m getting a value into two local variables, and comparing them. Again individually they work, yet when I run the function, I always get false (I got true in one instance with test data some time back but haven’t been able to recreate it for a while). So I wonder if my error is in my assignment statements near the end?

    ALTER FUNCTION dbo.PricingVolDataAvailableToDateProvided
    (@Ticker char,
     @StartDate DATETIME2,
     @NumberOfDaysBack int)
    RETURNS bit
AS
    BEGIN

    DECLARE @Result bit

    DECLARE @TargetDate DATETIME2
    SET @TargetDate=dbo.TradingDateByStartDate(@NumberOfDaysBack, @StartDate)

    DECLARE @DataPointDateFromTable DATETIME2
    SET @DataPointDateFromTable= (SELECT TOP (1) TradeDate
        FROM (SELECT TOP (@NumberOfDaysBack) TradeDate, Symbol
        FROM tblDailyPricingAndVol
        WHERE (Symbol = @Ticker AND TradeDate <= @StartDate)
        ORDER BY TradeDate DESC) AS T2
        ORDER BY TradeDate ASC)

    IF @DataPointDateFromTable = @TargetDate
        SET @Result = 1
    ELSE
        SET @Result = 0

    RETURN @Result

    END

Answer 1

The query looks fine, problem could be on dbo.TradingDateByStartDate function, check out if @DataPointDateFromTable and @TargetDate both have the date and time part of their values, or if you van to compare only date parts, cast them to DATE as described here.