TOPN Function (DAX)

Returns the top N rows of the specified table.

Syntax

```TOPN(<n_value>, <table>, <orderBy_expression>, [<order>[, <orderBy_expression>, [<order>]]…])

```

Parameters

n_value
The number of rows to return. It is any DAX expression that returns a single scalar value, where the expression is to be evaluated multiple times (for each row/context).

See the remarks section to understand when the number of rows returned could possible be larger than n_value.

See the remarks section to understand when an empty table is returned.

table
Any DAX expression that returns a table of data from where to extract the top ‘n’ rows.

orderBy_expression
Any DAX expression where the result value is used to sort the table and it is evaluated for each row of table.

order
(Optional) A value that specifies how to sort orderBy_expression values, ascending or descending:

valuealternate valueDescription
0 (zero)FALSESorts in descending order of values of order_by.

This is the default value when order parameter is omitted.
1TRUERanks in ascending order of order_by.

Return Value

A table with the top N rows of table or an empty table if n_value is 0 (zero) or less. Rows are not necessarily sorted in any particular order.

Remarks

• If there is a tie, in order_by values, at the N-th row of the table, then all tied rows are returned. Then, when there are ties at the N-th row the function might return more than n rows.

• If n_value is 0 (zero) or less then TOPN returns an empty table.

• TOPN does not guarantee any sort order for the results.

Example

The following sample creates a measure with the sales of the top 10 sold products.

```=SUMX(TOPN(10, SUMMARIZE(Product, [ProductKey], “TotalSales”, SUMX(RELATED(InternetSales_USD[SalesAmount_USD]), InternetSales_USD[SalesAmount_USD]) + SUMX(RELATED(ResellerSales_USD[SalesAmount_USD]), ResellerSales_USD[SalesAmount_USD]))

```