如何将这两个查询合并为一个？

Question

Query1:

    SELECT DISTINCT FirstOfFrequencyMHz, Min(LicenceData.distance) AS CoFX
FROM [Freq List], LicenceData
WHERE ((([LicenceData].class_stat) Like 'F*') And (([LicenceData].type_lc)="A") And (([LicenceData].frequency) Between FirstOfFrequencyMHz-0.0249 And FirstOfFrequencyMHz+0.0249))
GROUP BY FirstOfFrequencyMHz

Query2:

    SELECT DISTINCT FirstOfFrequencyMHz, Min(LicenceData.distance) AS CoMO
FROM [Freq List], LicenceData
WHERE ((([LicenceData].class_stat) Like 'M*') And (([LicenceData].type_lc)="A") And (([LicenceData].frequency) Between FirstOfFrequencyMHz-0.0249 And FirstOfFrequencyMHz+0.0249))
GROUP BY FirstOfFrequencyMHz

Combined Query Attempt:

SELECT DISTINCT FirstOfFrequencyMHz, 

(SELECT Min(distance) AS Expr1
FROM [Freq List], LicenceData
WHERE ((([LicenceData].class_stat) Like 'F*') And (([LicenceData].type_lc)="A") And (([LicenceData].frequency) Between FirstOfFrequencyMHz-0.0249 And FirstOfFrequencyMHz+0.0249))) as COFX,

(SELECT Min(distance) AS Expr1
FROM [Freq List], LicenceData
WHERE ((([LicenceData].class_stat) Like 'M*') And (([LicenceData].type_lc)="A") And (([LicenceData].frequency) Between FirstOfFrequencyMHz-0.0249 And FirstOfFrequencyMHz+0.0249))) as COMO

FROM [Freq List]

My posted combined query attempt does not return the correct values, all cells for the CoFX and CoMO columns have the same number in them.

The two queries work independently I just need to know how to combine them (there are 4 total queries I need to combine that are similar to the first 2 posted queries) or it it is even possible to combine them.

Answer 1

This may be the best way, as there is no direct link between the tables, you need to use sub-selects in order to ensure they are referenced correctly:

SELECT DISTINCT F.FirstOfFrequencyMHz,
(
SELECT Min(L.Distance)
FROM LicenceData As L
WHERE L.Class_Stat Like 'F*'
AND L.Type_LC = 'A'
AND L.Frequency Between F.FirstOfFrequencyMHz-0.0249 And F.FirstOfFrequency+0.0249
) CoFX,
(
SELECT Min(L2.Distance)
FROM LicenceData As L2
WHERE L2.Class_Stat Like 'M*'
AND L2.Type_LC = 'A'
AND L2.Frequency Between F.FirstOfFrequencyMHz-0.0249 And F.FirstOfFrequency+0.0249
) CoMO
FROM [Freq List] As F

Best of luck : )