Dax union column order.
I have 600 tables to perform a UNION ALL query on.
Dax union column order While I would assume that the system would recognize the name match and union them correctly, I think the UNION is just aligning the columns by order. Whether you’re using Power Query Editor, the DAX SELECTCOLUMNS function, or adjusting columns in visualizations, you’ll find the best approach for your needs. I tried using append query options in power query Jan 9, 2020 · Hi I have two tables and i am trying to make a summary table using "New Table". The result of the two tables should be something similar to "group by" function bases on both tables. These queries have the same column order in power query. In Power BI, sometimes, when we perform Union operation, the combined Jan 9, 2024 · This tutorial explains how to change the order of columns in Power BI, including several examples. How to use 'ORDER BY' in DAX? Sort table: Function SUMMARIZE not accepting the newly defined Column in next Names & Expressions How to Change Order of Columns in Power BI If you’re looking for a complete guide on how to change order of columns in Power BI, this article provides step-by-step methods to reorder columns efficiently. As Jul 26, 2023 · The ORDERBY, PARTITIONBY, and MATCHBY functions in DAX are special functions that can only be used along with DAX Window functions: INDEX, OFFSET, WINDOW, RANK, ROWNUMBER. Any ideas? Solved! Go to Solution. Columns not in the DAX query itself cannot be used in the ORDER BY. For example, if the first column of each table_expression has lineage to the same base column C1 in the model, the Aug 11, 2025 · DAX provides three powerful table / set functions for this: UNION, INTERSECT, and EXCEPT. The union function can be applied to multiple Learn about the powerful UNION, INTERSECT, and EXCEPT operators in DAX (Data Analysis Expressions). I have two tables. It returns a table that combines the records from each of the input table expressions. Jun 20, 2020 · A single value for column 'name' in table 'branches' cannot be determined. Or multiple columns with distinct (unique) combination of values, for a table expression argument. These functions match the columns across the tables by their position. How can I achieve that? My data looks May 31, 2017 · Your original DAX query would have worked if you had used month-start dates, due to the way DATEADD works. Learn how to manage a bunch Hi guys! I am having a bit of a problem with my columns. Behavior in case of unequal order of the columns in DAX 5. This can happen when a measure formula refers to a column that contains many values without specifying an aggregation such as min, max, count, or sum to get a single result. However, if combined columns have a lineage to different base columns, or if there is an extension column, the resulting column in UNION will have no lineage. Every column can be sorted in an ascending (ASC) or descending (DESC) way. I need to union two of the tables to be able to get what the user requires. However, in Power BI Desktop the columns are switched, column B on the left and column A on the right. Nov 26, 2025 · Returns a one column table that contains the distinct (unique) values in a column, for a column argument. An example of that is when you want to create that combination only virtually as part of a measure calculation that evaluates dynamically. Background I have been tasked with developing a report that calculates financial factors as well as IRR (XIRR to be specific). Any idea how to force DAX Jan 22, 2021 · Solved: Hi, I am new into PowerBi and I am wondering if it possible to union different tables with same fields but different number of columns. If this is not the case, we will need to use the TREATAS function to assign the correct lineage to the generated table. Here's how you can use the UNION function in Power BI: Launch Power BI Desktop and load the tables that you want to union. Mar 1, 2021 · As we have seen, the behavior of UNION in SQL Server and UNION in DAX within Power BI is very similar. Table = Var _Sales = Jul 17, 2018 · Hello Community, I have a calculated table with two types of records, invoices (INV1) and credit notes (RIN1). Union tables in Power BI DAX. DATEADD will follow the lineage of the column provided in the first argument, and only return dates that exist in that column. Nov 26, 2025 · For example, if the first column of each Table has lineage to the same base column C1 in the model, the first column in the UNION result will have lineage to C1. How could I accompli May 19, 2025 · Limitations and Considerations While powerful in its simplicity, DAX UNION does have some limitations: Performance: For very large datasets, DAX UNION can be slower compared to Power Query methods. The examples provided here use OFFSET, but are similarly applicable to the other Window functions. There are five queries，2017，2018，2019，2020, 2021. Is there any other way to perform UNION keeping the DAX formulas without have all this trouble when my data structure changes? Solved! Go to Solution. Apr 25, 2024 · The two tables must have the same number of columns. F. Apr 26, 2023 · Using DAX to Append/Union Tables In Power BI Background Union is a function in Power BI that allows you to create a stacked table out of similar data tables. I made sure they have same number of columns and same order of columns in power query but when I load these two tables, their sequence changes and gives me wrong data when I use Union function. Nov 12, 2020 · I could use the long-winded way of unioning both tables, keeping only those two columns and removing duplicates, but I expect there is a more efficient way of doing this I don't know about. The third table, however, which has the same columns as the summarized tables, has a different column ord Oct 12, 2020 · Tables with different column names and data lineage The arguments of set functions may have both different column names and a different data lineage. The column names in the return table will match the column names in table_expression1. Unfortunately the order of the columns in each table varies, however they will always have the same name - example: Table 1 Item, Cost, ID, Jun 4, 2021 · I am doing a DAX course and the trainer suggested the possibility of using SUMMARIZE with UNION to order columns and I wanted to know why the 1st attempt wouldn't work- just curious. Jan 26, 2025 · The ORDER BY only sorts the results of the DAX query, which is why I can refer to the column by name even when it only exists in the DAX query itself. The ORDERBY function in Power BI is a powerful tool that can help you sort data in a specific order. Apr 11, 2017 · Problem I'm trying to generate a table of distinct email addresses from multiple source tables. Jan 3, 2020 · The UNION function is a DAX function in Power BI that is used to combine rows from two or more tables, falling under the Table Manipulation DAX Functions category. In Power Query Editor the columns are in correct order, column A on the left and column B on the right. 5. Oct 3, 2021 · You cannot UNION dynamic tables (ie including measures) into a materialized (static) calculated table. The column names in the return table will match the column This formula sorts the EmployeeData table by the Department column in ascending order, and then by the Salary column in descending order. I have 600 tables to perform a UNION ALL query on. Here's how you can use the UNION function in Power BI: 1. Dec 30, 2016 · The DAX Union Formula mixes up some columns - guess that`s a bug and i have no clue how to avoid that. (see the followi Oct 2, 2020 · 5. so relationship will many to one between fact & custom dim. 6. Columns are combined by position in their respective tables. Oct 4, 2023 · UNION in DAX is used to combine data tables into a single table for analysis. You would need to look into Calculation Groups and add reference columns that identify which dimension the measure should calculate for. Go to the Modeling tab on the Power BI ribbon. This quick guide shows you the syntax to do this in Power BI Hello I'm trying to UNION () three tables that have the same exact columns (literally same SQL query but different on time frames), but the third table in the UNION () statement gets resorted and the columns do not fall in the proper section. Thanks in advance! Dec 13, 2023 · Introduces a statement that defines sort order of query results returned by an EVALUATE statement in a DAX query. Table 1 contains column A Table 2 contains column B Table 3 contains column C Table 4 contains column B I want to append column A and B to create column AB Then append column C and D to make column CD I’d also like to append 2 other columns, E and F, which are in tables 5 and 6 respectively, as they contain the IDs which Nov 13, 2018 · I am trying to write a DAX query that runs the SUMMARIZECOLUMNS function on a table variable. Mar 8, 2024 · ORDER BY DAX Statement The ORDER BY keyword is part of the EVALUATE statement and defines the sort order of the result produced by EVALUATE. Thanks! Mar 13, 2017 · I have two tables with different names for the columns but with the same meaning and I need to union the two tables to one table with the names of the columns in table A. It can include only columns that are part of EVALUATE or expressions that can be computed in the row context of the result. I'm testing this out and for some reason I cannot get the table that is returned with SELECTCOLUMNS () to order the columns in the order I set. Union means that the results of two or … For example, if the first column of each table_expression has lineage to the same base column C1 in the model, the first column in the UNION result will have lineage to C1. Apr 4, 2023 · This Power BI tutorial explains, Power BI Union Two Tables, Power BI union two tables with different numbers of columns, etc. I have tried creating a new table in Dax using UNION (DISTINCT - but I only know how to pull in one column into this table. The values obtained for the group-by columns include the blank values of invalid relationships. One way around this is to use SELECTCOLUMNS () to change the column order in my table variables so that they all line up for my UNION (). The returned table has lineage where possible. To get an overview here is the summary in tabular form: Mar 3, 2022 · Hi, im having one power query table and one dax calculated table. In this article, I’ll explain Read more about Combining Tables in Power BI: Union, Except Most of us have used Union DAX expression in Power BI. Key considerations include the need for compatible data types, consistent column order, and the ability to remove duplicates using the DISTINCT command. Dec 2, 2021 · I am trying to rebuilt the same report in a different pbix from scratch (report R2) and I went on to query dataflow {A,B,C} and simply copied the DAX query to generated Table D but they don't match because upon loading the order of each of the columns from A,B,C has changed. 4. Here's the formula and the wro Aug 28, 2018 · Hi, We have two tables created via DAX that we want to append to one table. However, if combined columns have lineage to different base columns, or if there is an extension column, the resulting column in UNION will have no lineage. The Power BI Union function combines multiple tables and creates a single table with merged values. This document explains how to combine data from different sources using the UNION command in DAX within Power BI, specifically demonstrating the creation of a new table from two sales datasets. the uniqunes is based on Material & Period combination. D. Can only be used within a Window function. Behavior in case of different column names in DAX 5. Conclusion First of all, the post is relatively detailed, for all of those who consider it too long (tl;dr) here is the comparison table: evallee416 Union Query with only select columns Is there a way to query two already imported tables in PowerBI to create a union similar to SQL Select X as Col1, Y as Col 2 ,Z as Col 3 from table1 Union Selct A, B, C from table 2 table 1 might have 10 columns and table 2 might have 100. I know that I need to use selectcolumns in order to keep the data lineage, but my formula is more complicated than the examples given on the Web and I can't figure it out. Basically union, appends rows from both the table which are common. Quantity and LineTotal (amount) are in positive absolute value and they need to be negative, discounting the net sales. I want to rank my data by 2 columns right inside my DAX as its concatenating rows randomly. Previously i have used Summary = DISTINCT(UNION(VALUES('Tab Dec 13, 2024 · Applies to: Calculated column Calculated table Measure Visual calculation Defines the expressions that determine the sort order within each of a window function’s partitions. Nov 26, 2025 · The expressions and order directions used to determine the sort order within each partition. E. I have 4 tables I need to merge into one and can’t use power query. Apr 12, 2023 · In addition, please review the following links and check if it can used as an workaround. When the name of a column in the same position is different, the result uses the name in the first table. By using this function, you can easily sort data by one or more columns and display it in a meaningful way. Understanding ORDERBY, PARTITIONBY, and MATCHBY is critical to successfully using the Window functions. The append query solution is also not working as it always loads both table, even with unchecking "enable load" and "include in report refresh". However, if combined columns have lineage to different base Apr 10, 2021 · Solved: I have a very simple DAX script written, however, DAX engine seems to ignore 'ORDER BY' (as per screenshot below). Any ideas? Jul 25, 2022 · Hello I'm doing custom table with select columns in dax calculations and when creating relationship sales, products , order gives me many-many options , so how can i check and remove duplicates from custom table. For example, if the first column of each table_expression has lineage to the same base column C1 in the model, the first column in the UNION result will have lineage to C1. This is probably a simple issue to solve but I can't seem to figure it out. You can use the Power BI Union function in the DAX expression to combine or join rows from multiple tables. These functions are especially useful in advanced calculations, comparative analysis, and custom table creation in reports. Aug 24, 2020 · Power Query is often the engine used for combining data tables, especially using Merge or Append. Mar 26, 2019 · For example, when I need to add a new column I need to add this column to all tables maintain the same order in all tables and then use the new column to the report. Because we created them via DAX we can't use Query Editor and we can't use UNION () because the order of columns is different. Refer similar DAX Post – EXCEPT, INTERSECT Points to be remember: The tables should be same number of columns. I only want the selected columns in the unioned table. But afer i apply the querie，four of them have change their column order in the data view, Thie cause the dax ‘union’ failed. Mar 17, 2021 · Hi all， I have a report，after i load the data soure. The default is ASC. You are being redirected. Jul 16, 2018 · The data does not Union into the correct columns. What is the most optimized way to reorder columns position in order to perform union? Also which view is the output view? Cuz in PQ and in Desktop table view i have columns in different positions. Behavior in case of more than 2 tables in DAX 6. Newly created columns are added at the end of the first table and they need to be combined with columns at the beginning of the second table. Oct 19, 2022 · I have a DAX which concatenates values from one column in my data. Nov 26, 2025 · Returns a table with selected columns from the table and new columns specified by the DAX expressions. Nov 26, 2025 · In order to apply a filter to the group-by column unconditionally, apply the filter through a CALCULATETABLE function that evaluates SUMMARIZECOLUMNS. Mar 20, 2024 · Method 1: Using DAX UNION Function The DAX UNION function allows you to combine two or more tables with identical columns into a single table. e. Mar 20, 2024 · Method 1: Using the DAX UNION Function The DAX UNION function allows you to combine two or more tables with identical columns into a single table. Jul 27, 2018 · Solved: when I union two same table, most data go to wrong column, who know how to fix this error, thank you Jan 17, 2023 · Hello, I'm trying to do a Union between two tables and the data doesn't go in the right columns. My problem is that the credit notes's data, i. Since D utilizes a DAX UNION, it is generating a different result. Consider the limitations of the Power BI Union before you recommend using it for your data Jun 14, 2019 · DAX Union with SelectColumns 06-14-2019 03:20 PM Hi - I am new to Power BI (coming from years with MSSQL and SSRS) and have a question regarding utilizing a combination of Union, SelectColumns and First/LastNonBlank. The order is maintained for the first two tables. Enhance your data analysis capabilities with these operators. However, with the UNION statement on the outer part of the statement, it isn't generating a truly di. The UNION function maintains the lineage of the columns only if the lineage of the two tables being joined is the same. The first two tables are summarized in the exact same way, and their resulting column order is also the same. Duplicate rows are retained. Feb 7, 2019 · Union two tables with different columns names and field order when I can't use the Query Editor 02-07-2019 03:56 AM I have been given a pbix file and been asked to make new visualisations to allow different analysis to be undertaken. Dec 13, 2024 · Applies to: Calculated column Calculated table Measure Visual calculation Returns a table with selected columns from the table and new columns specified by the DAX expressions. Here tables with the same number of columns are placed directly under each other. Nov 13, 2023 · The columns MUST be in the same order in both tables, if they are not it is possible that the UNION could still run, but give strange mixed results The data types of the columns must be compatible Jul 21, 2017 · I'm trying to use the UNION function with two summarized tables and a third table. The table variable is the union of two tables that have the same columns in the same order. However, sometimes, you might need to do that operation in DAX. Discover how to combine or compare data from multiple tables or queries and perform set operations in your DAX formulas. Column Matching: All input tables must have identical column structures, or you'll need to manually handle mismatches. The APPEND function in Power Query takes a different approach and combines the tables by column names.