Changing defaults table based on customizations table and composite keys

[jaryszek]

Hi Guys,

I am using PQ in Excel.

i have 2 sources: t_Defaults and t_Customizations with composite Key: Topology&Tier&Function

As a base i am using t_Defaults but what i want to do this is:

1) If any row in t_Customizations is fullfilled (all columns, if one is empty - skip this row !) replace corresponding row (composite key) with corresponding composite key from t_Defaults. 

2) If table t_Customizations is empty - just use t_Defaults. 

Expected result:

So as you can see:

1) First row has been replaced from (Topo1&Tier1&Function1 key) t_Defaults with corresponding values from t_Customizations

2) Second row   has been replaced from (Topo2&Tier2&Function2 key) t_Defaults with corresponding values from t_Customizations

3) third row from t_defaults was not replaced because key Topo3&Tier3&Function3 do not exists in t_Customizations table. 

I am adding also my example Excel into google drive:

https://drive.google.com/file/d/1XhjPvYp8QANPFb1n-KJG5aMSnPz4SiZC/view?usp=sharing

Please help how to do this. I am starting my adventure with PQ currently.

Best Wishes,

Jacek

[ziying35 · Accepted solution]

@jaryszek 

// t_Customizations
let
    Source = Excel.CurrentWorkbook(){[Name="t_Customizations"]}[Content]
in
    Source

// output
let
    keys = List.FirstN(Table.ColumnNames(t_Customizations), 3),
    acc = List.Accumulate(
              Table.ToRecords(t_Customizations),
              t_Defaults, 
              (s,c)=>let pos = Table.PositionOf(s, Record.SelectFields(c, keys), 0, keys) 
                     in Table.ReplaceRows(s, pos, 1, {c})
          )
in
    acc

// t_Defaults
let
    Source = Excel.CurrentWorkbook(){[Name="t_Defaults"]}[Content]
in
    Source

[v-juanli-msft]

Hi @jaryszek 

protocol1 =
IF (
    RELATED ( t_Customizations1[StorageProtocol] ) <> BLANK (),
    RELATED ( t_Customizations1[StorageProtocol] ),
    t_Defaults2[StorageProtocol]
)


version1 =
IF (
    RELATED ( t_Customizations1[ProtocolVersion] ) <> BLANK (),
    RELATED ( t_Customizations1[ProtocolVersion] ),
    t_Defaults2[ProtocolVersion]
)

Best Regards
Maggie
Community Support Team _ Maggie Li
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