Conditional column based on value from another table with matching values

[PowerBeeEye]

I have two tables:

Servers

Server_Name		Server_OS		Server_Latest_Patch
Server_1		Windows Server 2016		KB123
Server_2		Windows Server 2019		KB789
Server_3		Windows Server 2016		KB456

Critical_Patch

OS		KB_ID
Windows Server 2016		KB456
Windows Server 2019		KB789

I would like to have the conditional column like so

Servers

Server_Name		Server_OS		Server_Latest_Patch		Critical_Patch_Installed
Server_1		Windows Server 2016		KB123		No
Server_2		Windows Server 2019		KB789		Yes
Server_3		Windows Server 2016		KB456		Yes

The logic being:

1. For each row in the Servers table:
   1. If a match exists between Servers[Server_OS] and Critical_Patch[OS]
      1. If Servers[Server_Latest_Patch] equals Critical_Patch[KB_ID]
         1. Set Servers[Critical_Patch_Installed] to "Yes"
         2. Else set Servers[Critical_Patch_Installed] to "No"

What’s the best way to do so?

[v-yingjl · Accepted solution]

Hi @PowerBeeEye ,

You can create a calculated column using the below dax formula:

Critical_Patch_Installed =
IF (
    'Servers'[Server_OS] IN DISTINCT ( 'Critical_Patch'[OS] ),
    IF (
        'Servers'[Server_Latest_Patch] IN DISTINCT ( 'Critical_Patch'[KD_ID] ),
        "Yes",
        "No"
    ),
    "No"
)

Best Regards,
Yingjie Li

If this post helps then please consider Accept it as the solution to help the other members find it more quickly.

[amitchandak]

@PowerBeeEye , Try new column in Servers table

if(isblank(countx(filter(Critical_Patch,Servers[Server_OS] =Critical_Patch[OS]),Critical_Patch[KB_ID])),"No","Yes")

when Critical_Patch to Servers is 1 to M realtion

if(isblank(related(Critical_Patch[KB_ID])),"No","Yes")

[PowerBeeEye]

thank you, @amitchandak , but I don't see where the matching of the Critical_Patch[OS] and Servers[Server_OS] columns are being done.

To state again, this is what I am trying to do:

1. Create a conditional column named Critical_Patch_Installed in the Servers table
2. For each row in the Servers table:
   1. If a match exists between Servers[Server_OS] and Critical_Patch[OS]
      1. If Servers[Server_Latest_Patch] equals Critical_Patch[KB_ID]
         1. Set Servers[Critical_Patch_Installed] to "Yes"
         2. Else set Servers[Critical_Patch_Installed] to "No"

Thanks!

[richbenmintz]

Hi @PowerBeeEye,

You can do this in Power Query by Merging your Server table and your critcal patch tables on the join keys between the two tables and a custom column M Code Below

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WCk4tKkstijdU0lE6tEABjIDM8My8lPzyYgWIrIKRgaEZqgJvJ0MjY6VYHbgBRoQMsEQ3wNzCEtkAY5JdYGJqphQbCwA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Server_Name = _t, #"(blank)" = _t, Server_OS = _t, #"(blank).1" = _t, Server_Latest_Patch = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Server_Name", type text}, {"(blank)", type text}, {"Server_OS", type text}, {"(blank).1", type text}, {"Server_Latest_Patch", type text}}),
    #"Removed Columns" = Table.RemoveColumns(#"Changed Type",{"(blank).1", "(blank)"}),
    #"Merged Queries" = Table.NestedJoin(#"Removed Columns", {"Server_OS", "Server_Latest_Patch"}, Critical_Patch, {"OS", "KB_ID"}, "Critical_Patch", JoinKind.LeftOuter),
    #"Expanded Critical_Patch" = Table.ExpandTableColumn(#"Merged Queries", "Critical_Patch", {"KB_ID"}, {"KB_ID"}),
    #"Added Custom" = Table.AddColumn(#"Expanded Critical_Patch", "Critical Patch Installed", each if [KB_ID] <> null then "Yes" else "No")
in
    #"Added Custom"

you can also create a custom column in your Servers Table using DAX

Patched = 
var patched = LOOKUPVALUE(Critical_Patch[KB_ID], Critical_Patch[KB_ID], 'Servers'[Server_Latest_Patch], Critical_Patch[OS], [Server_OS])
return if(patched <> BLANK(), "Yes", "No")

Hope this helps,
Richard

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