Because the two columns are in different tables, DAX needs to inspect the full cross-join of their values. The problem of this query is that it is summarizing by Sales and Product. Spend some time not only optimizing it – given the topic of the article, the optimization should be an easy feat – but also understanding exactly why it is so slow. If you are interested in optimizing DAX, we can only suggest that you stop reading, download the demo file and run the query in DAX Studio. On our Contoso model, this query – that works on a single day – takes around 14 seconds to run. Therefore, each cell is evaluated in a filter context that contains one value for a column currently being grouped by.Īs a reference, this is the query that generates the matrix – just a bit polished to make it more readable: The query often uses SUMMARIZECOLUMNS to perform a grouping by the columns ( Brand, in this case) that the user puts on rows or on columns. How come a matrix – or any visual – is performing a grouping? When Power BI needs the results for a visual, it runs a DAX query. The first point, Brand, deserves a better explanation. It is not part of the matrix because of this, no grouping is happening. Calendar Year has two values visible, because of the slicer.But because Category is not part of the matrix, ISINSCOPE is FALSE. Category has only one value visible, due to the filter coming from the slicer.For this reason, both HASONEVALUE and ISINSCOPE are TRUE. Brand is also being grouped by the query generated by Power BI to create the matrix. Brand has one value visible, because it is filtered by the matrix.With the aid of a report, let us check how the functions behave in different cells of the matrix. ISINSCOPE checks that a column is currently being filtered because it is part of a grouping performed by a summarizing function.HASONEVALUE checks that a column has exactly one value visible in the current filter context.Let us start with the definition of the two functions: Therefore, in order to choose which one to use, it is necessary to clearly understand the scenarios where they produce a different result. Learning when to use either of those functions is important to obtain efficient formulas.Įven though the two functions are different in their implementation, their net result is very close. ISINSCOPE and HASONEVALUE serve different purposes, and they have a different impact on performance. To most DAX coders, the two versions of the formula yield the same result. You can obtain a similar behavior by using HASONEVALUE: It is very common to see code snippets like the following, to show the value only at the Year level and below: The popular clsx function for generating class names.HASONEVALUE and ISINSCOPE are two DAX functions that are mostly used by developers to check the current level of a hierarchy. Returns the value of the given custom field. Returns the name of the country, respecting the language of the invoice/proposal. join (strings: Array, separator: string): string This helper handles several known address formats, such as German, US and UK addresses. Joins together the components of an address by a given separator, skipping falsey values. Joins together an array of strings by a given separator, skipping falsey values. formatUnit (quantity: number, unit: Unit | null): string If the language of the invoice or proposal is not part of the unit's labels, it will fallback to show the unit in another language.įormatUnit is used internally by formatQuantity and can be used to show only the label of a unit. Returns a unit's plural or singular label in the correct language of the invoice or proposal. #Example // item.unit is a unit for "hours": formatQuantity (quantity: number, unit: Unit | null): string If the language of the invoice or proposal is not part of the unit's labels, it will fallback to show the unit in another language. Returns a string containing the quantity of an item and its unit label in the correct language of the invoice or proposal. formatMoneyValue (value: MoneyValue): string Returns a formatted money value, respecting the language of the invoice/proposal and the currency of the Returns a formatted date string, respecting the language of the invoice/proposal. The following helper functions are available in the template.ejs file of invoice and proposal templates.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |