Access SQL Crosstab Function SELECT TOP 1 - sql

Question

I am calculating waste based on an administered amount corrected using a correction factor read from a table. The structure of the tables with some sample data is below:
RMP Administrations:
Nuclide Product MBq Date Given
-------------------------------------------------
Tc-99m Pertechnetate 700 2018/01/01
I-131 NaI 399 2018/02/01
I-131 NaI 555 2018/01/01
I-123 MIBG 181 2018/01/01
I-123 NaI 29 2018/01/03
WasteFactors
Nuclide Product MinActivity MaxActivity Factor
------------------------------------------------------------
Tc-99m * 0.3
I-123 * 150 0.3
I-123 * 150 1
I-123 MIBG 0.6
I-131 * 400 0.5
I-131 * 400 1
So this table is complex, but it is the best way I can think of to represent the correction factors in a table. Nuclide is matched first, then if product matches that correction factor is used, finally we check the activity (MBq) against the Min / Max columns to decide. We then use this factor along with the activity to determine the waste using the following SQL
SELECT
Nuclide,
[Date Given] AS Given,
(SELECT TOP 1
Factor
FROM WasteFactors
WHERE [RMP Administrations].Nuclide = WasteFactors.Nuclide
AND [RMP Administrations].Product LIKE WasteFactors.Product
AND (WasteFactors.MinActivity IS NULL
OR WasteFactors.MinActivity > [RMP Administrations].MBq)
AND (WasteFactors.MaxActivity IS NULL
OR WasteFactors.MaxActivity <= [RMP Administrations].MBq)
ORDER BY WasteFactors.Nuclide ASC, WasteFactors.Product DESC)
AS Waste
FROM [RMP Administrations] WHERE NOT [RMP Administrations].Nuclide IS NULL AND NOT [RMP Administrations].MBq IS NULL
So this achieves what we require by sorting the Factor table so that factors with a product name appear before factors which apply to all other products, so with the data above 'I-123 MIBG' is checked before 'I-123 *'.
so, running this SQL along with the data above should return the following:
Nuclide Given Waste
--------------------------------------------------------
Tc-99m 2018/01/01 0.3 (All Tc-99m is 0.3)
I-131 2018/02/01 1 (Activity <=400)
I-131 2018/01/01 0.5 (Activity >400)
I-123 2018/01/01 0.6 (Product is MIBG)
I-123 2018/01/03 0.3 (Not MIBG, <150)
with that factor used as MBq * (SELECT TOP 1...) AS Waste in the real code. So... this works fine; and I can summarise by data annually with a normal SUM(Waste), GROUP BY Nuclide and WHERE Year(Given)=[Enter Year]. My issues begin when I try to use this in the following crosstab query:
PARAMETERS [Enter Year] Short;
TRANSFORM SUM(T.MBq *
(SELECT TOP 1
Factor
FROM WasteFactors
WHERE T.Nuclide = WasteFactors.Nuclide
AND T.Product LIKE WasteFactors.Product
AND (WasteFactors.MinActivity IS NULL
OR WasteFactors.MinActivity >T.MBq)
AND (WasteFactors.MaxActivity IS NULL
OR WasteFactors.MaxActivity <= T.MBq)
ORDER BY WasteFactors.Nuclide ASC, WasteFactors.Product DESC)
)
SELECT T.Nuclide
FROM [RMP Administrations] AS T
WHERE Year(T.[Date Given])=[Enter Year]
GROUP BY T.Nuclide
PIVOT Format(T.[Date Given],"mm - mmm");
giving the error 'Access does not recognise T.Nuclide as a valid field or....'. I can't see an error in my SQL, and don't see why it should not work as written, I have tried making a VBA function to calculate the waste amount SUM(GetWaste(Nuclide, Product,MBq)), with the function running the same SQL as above in a recordset however then my query is too complex to be evaluated.
Does anyone have any ideas on where I have gone wrong with my crosstab query, how I can restructure my WasteFactors to make then easier to query, or is this just too complex to try to do in SQL and I should just do it in VBA it instead?
The real data set is ~1000 records, spanning multiple months, I would like to change Table and Col names to something not crap but I didn't create the database. Expected output for above data would be:
Nuclide 01 - Jan 02 - Feb
-------------------------------
Tc-99m 210
I-131 277.5 399
I-123 117.3

Answer 1

You can't use a subquery in a TRANSFORM clause in that way afaik.
Use a subquery in your FROM clause multiplying that subquery with MBq. Then only use a plain aggregate in the TRANSFORM clause
Sample, probably needs refining:
PARAMETERS [Enter Year] Short;
TRANSFORM SUM(TransformField)
SELECT R.Nuclide
FROM (SELECT *,
Mbq * (SELECT TOP 1
Factor
FROM WasteFactors
WHERE T.Nuclide = WasteFactors.Nuclide
AND T.Product LIKE WasteFactors.Product
AND (WasteFactors.MinActivity IS NULL
OR WasteFactors.MinActivity >T.MBq)
AND (WasteFactors.MaxActivity IS NULL
OR WasteFactors.MaxActivity <= T.MBq)
ORDER BY WasteFactors.Nuclide ASC, WasteFactors.Product DESC) As TransformField
FROM [RMP Administrations] T
) AS R
WHERE Year(R.[Date Given])=[Enter Year]
GROUP BY R.Nuclide
PIVOT Format(R.[Date Given],"mm - mmm");