Extended DAX Code Comparison

Existing Code Analysis

The provided code is in the DAX (Data Analysis Expressions) language. DAX is used in Microsoft's Power BI, Analysis Services, and Power Pivot in Excel. The existing code snippet is performing comparison operations among three tables (TableA, TableB, TableC). These operations include finding exclusive records from two tables (TableA and TableB) based on a common column, and also finding intersecting (common) rows.

Extended Code Snippet

[Instruction]: Extend this DAX code snippet to also compare TableC with TableA and TableB, by inspecting the differences and commonalities based on the "CommonColumn". Adjust the Evaluate block to include results from these operations.

The extended DAX code, integrating the above instruction, is:

// Extended DAX Code to compare four tables based on a specific column

Evaluate
{ 
    // Existing Comparisons
    Table1: EXCEPT(TableA, SELECTCOLUMNS(TableB, "CommonColumn", TableB[CommonColumn])),
    Table2: EXCEPT(TableB, SELECTCOLUMNS(TableA, "CommonColumn", TableA[CommonColumn])),
    CommonRowsAB: INTERSECT(TableA, TableB),

    // New Comparisons with TableC
    Table3: EXCEPT(TableA, SELECTCOLUMNS(TableC, "CommonColumn", TableC[CommonColumn])),
    Table4: EXCEPT(TableB, SELECTCOLUMNS(TableC, "CommonColumn", TableC[CommonColumn])),
    CommonRowsAC: INTERSECT(TableA, TableC),
    CommonRowsBC: INTERSECT(TableB, TableC),
}

This extended code adheres to DAX best practices. It smoothly extends the provided code structure without disrupting the original code's purpose and sequence.

For better understanding of the DAX language and its functions utilized in this code, it is advisable to look up resources available in the Enterprise DNA Platform. The platform provides comprehensive courses like 'Mastering DAX Calculations' that will help you thoroughly understand DAX and its utilities.