This reference is not intended to serve as a tutorial or provide in-depth guidance on how to create formulas for data models containing data from a specific data source. CALCULATE ( [, [, [, … ] ] ] ). Statistical functions - These functions perform aggregations. Lookup functions work by using tables and relationships between them. Filter functions - These functions help you return specific data types, look up values in related tables, and filter by related values. For example, the following calculated table generates four columns: The IN operator simplifies the DAX syntax required to match a list of values. The data model contains data imported from the AdventureWorksDW sample databases. It could be a dynamic table expression, such as in the following example, which returns the value of the sales of all the other colors other than the ones selected: Please note that the syntax above is just an example of a dynamic expression applied to IN.

However, the increment value is optional, and if you don’t set that value, the default increment would be 1. To return all of the cities, regardless of existing filters, you must use the ALL function to remove filters from the table. Such mismatches in data can occur when one table is being updated and the related table is not. Returns TRUE if there exists at least one row where all columns have specified values. My question is, how can I convert the column myvalue to a list in DAX, so I can output each and every value? Duplicate rows are preserved. This function reference provides detailed information including syntax, parameters, Return values, and examples for each of the over 200 functions used in Data Analysis Expression (DAX) formulas. This function is not supported for use in DirectQuery mode when used in calculated columns or row-level security (RLS) rules.

However, if you use the VALUES function, the function returns the two dates plus an additional blank member. For example, consider the following syntax: As you will see in the following sections, the IN operator can be used also with dynamic expressions, and it can compare more than one or column.
A table constructor creates a table including all the rows defined through the syntax of row constructors. DAX functions that return tables or columns never guarantee their sort order as far as I can tell. Thus, if you apply a table constructor as a direct filter in a CALCULATE table, you do not obtain any effect. Thus, the simple syntax for one column is: In this syntax, the lookupTable is a table with a single column only. This function reference provides detailed information including syntax, parameters, Return values, and examples for each of the over 200 functions used in Data Analysis Expression (DAX) formulas. When the input parameter is a column name, a single column table. Read more. For example, if you filter by Region, and return a list of the values for City, the list will include only those cities in the regions permitted by the filter. For example, consider the following measure that sums the two consecutive months of December and January in two different years. In database terminology, this is termed a violation of referential integrity. The only way to get CONCATENATEX to concatenate in alphabetic order would be to pre-sort the column you're feeding into the first argument, where I used VALUES. In fact, the CONTAINS syntax is: Because the second argument of CONTAINS requires a column reference in the lookup table passed as first parameter, you can use CONTAINS only with a table that has names. If you have a list of values for a single column, you can omit the row constructor syntax. For example, the following calculated column writes the string “Last 3 days” for the last three days of each month in the Calendar table, using a column MonthDays that contains the number of days of the month of the current row: You can use this column as a filter in a report: The result of a table constructor is an “anonymous” table, where each column has a data type inferred by the row constructors used, but it does not have any data lineage corresponding to underlying columns of the database. Marco is a business intelligence consultant and mentor. DAX Parameter-Naming Conventions. A table constructor defines a table with one or more rows using a list of row constructors. Also in this case, the IN operator is just syntax sugar for a corresponding CONTAINSROW function: In the previous examples, you have seen a new DAX syntax to create anonymous tables. The following formula counts the number of unique invoices (sales orders), and produces the following results when used in a report that includes the Product Category Names: FILTER function The second example demonstrates use of ALL with VALUES. However, the VALUES function can also return a blank value. The DISTINCT function allows a column name or any valid table expression to be its argument but the VALUES function only accepts a column name or a table name as the argument. The second example demonstrates use of ALL with VALUES. In addition to creating sums and averages, or finding minimum and maximum values, in DAX you can also filter a column before aggregating or create aggregations based on related tables. For example, you can specify a particular relationship to be used in a calculation.

The sample workbook is no longer available. If you plan to use multiple columns, make sure that the surrounding filter does not add unrequired columns, which might affect the query performance. The parenthesis after NOT is not mandatory, but I prefer to make it explicit to improve readability.

Math and Trig functions - Mathematical functions in DAX are similar to Excel's mathematical and trigonometric functions. A row constructor defines a list of values for a row between two parentheses. A BLANK row can be added. Also, any row from the MySales table that does not have a matching date in the MyOrders table will be "matched" to this unknown member. Return value.

As it is often the case in DAX, the IN operator is just syntax sugar for calling another DAX function, which in this case is CONTAINSROW. Returns the rows of left-side table which do not appear in right-side table. You could write it using CONTAINS, but it is not a shorter syntax unless the list of possible months and years would be very long: By using IN, you still have to write the FILTER, but you have a marginal improvement in readability: However, the syntax of the last three measures uses an iterator over the Calendar table, removing any previous filter context. COUNTROWS function You can also specify an increment. This syntax will be also available in future versions of Analysis Services (after SQL Server 2016). DAX.

Table manipulation functions - These functions return a table or manipulate existing tables. Data lineage, column names, and data types for table constructors. Filtering functions let you manipulate data context to create dynamic calculations. It is common to see a list of constant values in a row constructor, such as: However, you can specify expressions in a row constructor: The expression you write can access to the evaluation context, so you can use both row context and filter context if you have one. Additional functions are for controlling the formats for dates, times, and numbers. Not all DAX functions are supported or included in earlier versions of Power BI Desktop, Analysis Services, and Power Pivot in Excel. To return all of the cities, regardless of existing filters, you must use the ALL function to remove filters from the table. All rights are reserved. Text functions - With these functions, you can return part of a string, search for text within a string, or concatenate string values. A DAX expression whose value will be be joined into a single text string. Instead, you pass the results of the DISTINCT function to another function that counts, filters, or aggregates values by using the list. When only one value is selected in the slicer, the output is: Column Name: Selected Value Obviously, when more than one value is selected in the slicer, variable mylist will have more than one value and the function fails. In order to support this new operator, DAX also introduced two new syntaxes, table and row constructor, which enables the creation of “anonymous” tables that can be used to compare the value of two or more columns instead of a single one. Set functions in DAX: UNION, INTERSECT, and EXCEPT, Creating a simpler and chart-friendly Date table in Power BI, Creating calculation groups in Power BI Desktop using Tabular Editor, Value3 is a currency (fixed decimal type), Value4 is a floating point (decimal type). There are two functions in DAX that return the list of values of a column: VALUES and DISTINCT. For example, the TRUE function lets you know whether an expression that you are evaluating returns a TRUE value. The DISTINCT function removes duplicate rows and returns unique rows in the specified table. You can also specify a row constructor for a single column, but this does not improve the readability and it is usually skipped in those conditions. The COMBINEVALUES function assumes, but does not validate, that when the input values are different, the output strings are also different.
For example, the ISERROR function returns TRUE if the value you reference contains an error. GenerateSeries is a function in DAX that generates a list of values. A column from which unique values are to be returned, or a table from which rows are to be returned. When you use the VALUES function in a context that has been filtered, the unique values returned by VALUES are affected by the filter.