Unique and consecutive values count and list to one string

[Rule83]

Here is the thing. Maybe due to of all the (probable) possibilities I can't figure out exactly how to do the following. My preference is to do it via the query editor (M). This to I can (re)use and maybe modify it for other projects:

Table is called 'Data'

Names     Value
NameB     X
NameB     X
NameA     Y
NameB     Y
NameC     X
NameC     X

Desired operations/functions:
1. Look for all unique Names and count them consecutively and list them in CountCONS
2. Look for alle unique Names and count the total of occurences and list them in CountALL
3. Add (in consecutive order) CURRENT&ALLPREVIOUS  Values into one string and list them in ValuesCONS behind every row
4. Add (in consecutive order) ALL the Values into one string and list them in ValuesALL behind every row
5. Look for the values "X" AND "Y" in ValuesALL and if both are found at least 1 time (no matter the order) list "YES" in column Combination otherwise "NO"

Desired output:
Names     Values     CountCONS     CountALL     ValuesCONS     ValuesALL     Combination
NameB     X          1             3            X              XXY           YES
NameB     X          2             3            XX             XXY           YES
NameA.    Y          1             1            Y              Y             NO
NameB.    Y          3             3            XXY            XXY           YES
NameC.    X          1             2            X              XX            NO
NameC.    X          2             2            XX             XX            NO

I've already used many googled variants with COUNT/COUNTX/FILTER/SUMMARISE/FILTER etc the last 2 days. but I got 'lost in translation'. Maybe a bit extensive, but maybe many others can be helped by this as well.

Hope you can help.

[MarcelBeug · Accepted solution]

Sure:

let
    Source = Data,
    AddedOriginalSort = Table.AddIndexColumn(Source, "OriginalSort", 1, 1),
    Grouped = Table.Group(AddedOriginalSort, {"Names"}, {{"GroupedData", each _, type table}, {"CountALL", each Table.RowCount(_), type number}, {"ValuesALL", each Text.Combine([Value]), type text}}),
    AddedCountCONS = Table.TransformColumns(Grouped,{{"GroupedData", each Table.AddIndexColumn(_,"CountCONS",1,1)}}),
    ExpandedGroupedData = Table.ExpandTableColumn(AddedCountCONS, "GroupedData", {"Value", "OriginalSort", "CountCONS"}),
    OriginalSort = Table.Sort(ExpandedGroupedData,{{"OriginalSort", Order.Ascending}}),
    RemovedOroginalSort = Table.RemoveColumns(OriginalSort,{"OriginalSort"}),
    AddedValuesCONS = Table.AddColumn(RemovedOroginalSort, "ValuesCONS", each Text.Start([ValuesALL],[CountCONS])),
    AddedCombination = Table.AddColumn(AddedValuesCONS, "Combination", each if Text.Contains([ValuesALL],"X") and Text.Contains([ValuesALL],"Y") then "YES" else "NO"),
    ReorderedColumns = Table.ReorderColumns(AddedCombination,{"Names", "Value", "CountCONS", "CountALL", "ValuesCONS", "ValuesALL", "Combination"})
in
    ReorderedColumns

[Rule83]

Superb! I'll figure out how you've build it up and test it.