DAX Duplicate Count Measure

Notes

Replace 'Sales'[KeyColumn] with the column (or combination, using a concatenated helper column) that should be unique.

Requirements

• Any table with a column that's expected to be unique.

How to use this measure

1. In Power BI Desktop, select the table that should hold the measure and choose New measure on the ribbon.
2. Paste the code, then replace the placeholder table and column names with your own. The My table names fields above do this for you.
3. Run it through the DAX Formatter if you want it laid out in your team's style.

Related DAX measures

• Uniqueness %Expresses distinct values in a column as a percentage of total rows, a basic data quality check.
• Orphan Records CountCounts fact rows whose key doesn't exist in the related dimension table, indicating a broken relationship.
• Completeness %Expresses non-blank values in a column as a percentage of total rows, a basic data quality check.
• Null / Blank CountCounts how many rows have a blank value in a given column.
• Validity % (Rows Passing a Rule)Expresses rows that satisfy a validation rule as a percentage of total rows.
• Rows Failing a RuleCounts rows that fail a validation rule, the complement of the Validity % measure.

More DAX resources

Browse all 175 measures in the Power BI DAX Measures Library, or search the library for something similar to Duplicate Count.