let
    Sales = Table.FromRecords({
        [ProductID = 1, Product = "Laptop", Price = 999],
        [ProductID = 2, Product = "Mouse", Price = 25],
        [ProductID = 1, Product = "Laptop", Price = 999]
    }),
    Unique = Table.Distinct(Sales)
in
    Unique

let
    Customers = Table.FromRecords({
        [CustomerID = "C001", Name = "John", City = "Bangkok"],
        [CustomerID = "C002", Name = "Jane", City = "Bangkok"],
        [CustomerID = "C001", Name = "John", City = "Chiang Mai"]
    }),
    UniqueByID = Table.Distinct(Customers, "CustomerID")
in
    UniqueByID

let
    Orders = Table.FromRecords({
        [OrderID = 1, CustomerID = "C001", Amount = 500],
        [OrderID = 2, CustomerID = "C002", Amount = 300],
        [OrderID = 3, CustomerID = "C001", Amount = 500]
    }),
    UniqueByIDAmount = Table.Distinct(Orders, {"CustomerID", "Amount"})
in
    UniqueByIDAmount

let
    ImportedEmails = Table.FromRecords({
        [Email = "john@example.com", Source = "LinkedIn"],
        [Email = "jane@example.com", Source = "Facebook"],
        [Email = "john@example.com", Source = "Gmail"],
        [Email = "bob@example.com", Source = "LinkedIn"]
    }),
    UniqueEmails = Table.Distinct(ImportedEmails, "Email"),
    Result = Table.SelectColumns(UniqueEmails, {"Email"})
in
    Result