Table.Keys
Returns the identifiers of the designated table.
Retrieve the list of primary keys for a specific table in Power Query. To do this, use the M language with the following code:
```M
let
table = Table.FromRecords({
[Id = 1, Name = "Hello There"],
[Id = 2, Name = "Good Bye"]
}),
tableWithKeys = Table.AddKey(table, {"Id"}, true),
keys = Table.Keys(tableWithKeys)
in
keysOutput{[Columns = {"Id"}, Primary = true]}
```