Table.Join

Syntax

Table.Join(table1 as table, key1 as any, table2 as table, key2 as any, optional joinKind as nullable number, optional joinAlgorithm as nullable number, optional keyEqualityComparers as nullable list) as table

About

Joins the rows of table1 with the rows of table2 based on the equality of the values of the key columns selected by key1 (for table1) and key2 (for table2).

By default, an inner join is performed, however an optional joinKind may be included to specify the type of join. Options include:

• JoinKind.Inner
• JoinKind.LeftOuter
• JoinKind.RightOuter
• JoinKind.FullOuter
• JoinKind.LeftAnti
• JoinKind.RightAnti
• JoinKind.LeftSemi
• JoinKind.RightSemi

An optional set of keyEqualityComparers may be included to specify how to compare the key columns. This parameter is currently intended for internal use only.

Example 1

Join two tables using a single key column.

Usage

Table.Join(
    Table.FromRecords({
        [CustomerID = 1, Name = "Bob", Phone = "123-4567"],
        [CustomerID = 2, Name = "Jim", Phone = "987-6543"],
        [CustomerID = 3, Name = "Paul", Phone = "543-7890"],
        [CustomerID = 4, Name = "Ringo", Phone = "232-1550"]
    }),
    "CustomerID",
    Table.FromRecords({
        [OrderID = 1, CustomerID = 1, Item = "Fishing rod", Price = 100.0],
        [OrderID = 2, CustomerID = 1, Item = "1 lb. worms", Price = 5.0],
        [OrderID = 3, CustomerID = 2, Item = "Fishing net", Price = 25.0],
        [OrderID = 4, CustomerID = 3, Item = "Fish tazer", Price = 200.0],
        [OrderID = 5, CustomerID = 3, Item = "Bandaids", Price = 2.0],
        [OrderID = 6, CustomerID = 1, Item = "Tackle box", Price = 20.0],
        [OrderID = 7, CustomerID = 5, Item = "Bait", Price = 3.25]
    }),
    "CustomerID"
)

Output

Table.FromRecords({
    [CustomerID = 1, Name = "Bob", Phone = "123-4567", OrderID = 1, Item = "Fishing rod", Price = 100],
    [CustomerID = 1, Name = "Bob", Phone = "123-4567", OrderID = 2, Item = "1 lb. worms", Price = 5],
    [CustomerID = 2, Name = "Jim", Phone = "987-6543", OrderID = 3, Item = "Fishing net", Price = 25],
    [CustomerID = 3, Name = "Paul", Phone = "543-7890", OrderID = 4, Item = "Fish tazer", Price = 200],
    [CustomerID = 3, Name = "Paul", Phone = "543-7890", OrderID = 5, Item = "Bandaids", Price = 2],
    [CustomerID = 1, Name = "Bob", Phone = "123-4567", OrderID = 6, Item = "Tackle box", Price = 20]
})

Example 2

Join two tables that have conflicting column names, using multiple key columns.

Usage

let
    customers = Table.FromRecords({
        [TenantID = 1, CustomerID = 1, Name = "Bob", Phone = "123-4567"],
        [TenantID = 1, CustomerID = 2, Name = "Jim", Phone = "987-6543"]
    }),
    orders = Table.FromRecords({
        [TenantID = 1, OrderID = 1, CustomerID = 1, Name = "Fishing rod", Price = 100.0],
        [TenantID = 1, OrderID = 2, CustomerID = 1, Name = "1 lb. worms", Price = 5.0],
        [TenantID = 1, OrderID = 3, CustomerID = 2, Name = "Fishing net", Price = 25.0]
    })
in
    Table.Join(
        customers,
        {"TenantID", "CustomerID"},
        Table.PrefixColumns(orders, "Order"),
        {"Order.TenantID", "Order.CustomerID"}
    )

Table.FromRecords({
    [TenantID = 1, CustomerID = 1, Name = "Bob", Phone = "123-4567", Order.TenantID = 1, Order.OrderID = 1, Order.CustomerID = 1, Order.Name = "Fishing rod", Order.Price = 100],
    [TenantID = 1, CustomerID = 1, Name = "Bob", Phone = "123-4567", Order.TenantID = 1, Order.OrderID = 2, Order.CustomerID = 1, Order.Name = "1 lb. worms", Order.Price = 5],
    [TenantID = 1, CustomerID = 2, Name = "Jim", Phone = "987-6543", Order.TenantID = 1, Order.OrderID = 3, Order.CustomerID = 2, Order.Name = "Fishing net", Order.Price = 25]
})