Tableau Calculated Fields and LOD Expressions Explained With Examples
Write and understand calculations, including level of detail.
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Help me write Tableau calculations. My data fields and types: [FIELDS]. What I need to calculate: [CALCULATIONS]. Sample rows: [SAMPLE_ROWS]. Use only fields I listed, and test each formula on a small known sample first. Present a table with Goal, Formula, Explanation of each part, and Test result on my sample rows with the arithmetic. Cover row-level calculations (IF, CASE, DATEDIFF, string functions), aggregate calculations (SUM, AVG, COUNTD), table calculations (running total, percent of total, rank) and level of detail expressions (FIXED, INCLUDE, EXCLUDE), and when to use an LOD expression instead of a table calculation. Explain the order of operations in simple words (extract and data source filters, context filters, FIXED calculations, dimension filters, measure filters, table calculations) so I understand why a filter may not affect an LOD. Common errors, such as mixing aggregate and non-aggregate values, and the fix. Mark syntax and function behaviour you cannot verify [VERIFY].
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