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  1. #1
    frustratedwithaccess is offline Advanced Beginner
    Windows 7 64bit Access 2013
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    expression builder

    Hello All,



    Quick question re building an expression to calculate the value of a calculated column:

    I have 4 columns: "Precipitation1", "Precipitation2", "Totalrainfall1", and "Totalrainfall2".

    Totalrainfall2 is the calculated column of Precipitation1 + Precipitation2. If there is no value (i.e. blank cell) from adding Precipitation1 and Precipitation2, I want to use the value from Totalrainfall1 in Totalrainfall2. Any help with building this expression is much appreciated.

    Cheers!

  2. #2
    ranman256's Avatar
    ranman256 is offline VIP
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    This sounds like 2 different queries
    Q1 : an update qry to upd Totalrainfall2 =Totalrainfall1, where of isnull(Precipitation1) or isnull(Precipitation2)
    then
    Q2 : an update qry to upd Totalrainfall2 =(Precipitation1 + Precipitation2), where of not isnull(Precipitation1) and not isnull(Precipitation2)

  3. #3
    RuralGuy's Avatar
    RuralGuy is offline Administrator
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    How about something like:
    Totalrainfall2 = IIF( (Nz(Precipitation1,0) + Nz(Precipitation2,0)) = 0 , Totalrainfall1 , Nz(Precipitation1,0) + Nz(Precipitation2,0))
    (RG for short) aka Allan Bunch Previous MS Access MVP - WinXP Pro, Win7 Pro Win10 Pro - acXP, ac07, ac10, ac13
    How to mark the thread as Solved!
    Teaching is not filling a bucket but lighting a fire.
    Borrowed quote..."Docendo discimus"

  4. #4
    frustratedwithaccess is offline Advanced Beginner
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    unfortunately both of these don't seem to be working...

  5. #5
    RuralGuy's Avatar
    RuralGuy is offline Administrator
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    How are you using the solutions? Calculated values should be derived in a query and not occupy a field in a table.
    (RG for short) aka Allan Bunch Previous MS Access MVP - WinXP Pro, Win7 Pro Win10 Pro - acXP, ac07, ac10, ac13
    How to mark the thread as Solved!
    Teaching is not filling a bucket but lighting a fire.
    Borrowed quote..."Docendo discimus"

  6. #6
    mitch_pearce79 is offline Novice
    Windows 7 32bit Access 2007
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    try
    Expression for Totalrainfall2
    =IIF(Precipitation1 is null, IIF(Precipitation2 is null,Totalrainfall1,Precipitation2),IIF(Precipitat ion2 is null,Precipitation1,Precipitation1+Precipitation2) )

  7. #7
    rpeare is offline VIP
    Windows XP Access 2003
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    I think you want to use isnull([field]) not field is null in your expression mitch
    As someone pointed out totalrainfall2 is a calculated value and should not be stored. But in a query you could have the formula


    TotalRainfall2: iif(isnull([precipitation1]) and isnull([precipitation2]), totalrainfall1, nz([precipitation1],0) + nz([precipitation2],0))

  8. #8
    mitch_pearce79 is offline Novice
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    Can't argue with that!

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