# Calculate across rows Shape / table running total, lag, lead, moving average, multi-row formula Page: ## Status Runs as a SQL step. arcform carries it as a `sql:` step today. ## The DuckDB step running total, lag and moving average It reads the `orders` table the proofs share. Create it first: ```sql CREATE TABLE orders AS SELECT * FROM (VALUES (1, 'Alice Ng', 'north', DATE '2026-01-03', 120.00, 'widget', 'a|b', '{"channel":"web","items":[1,2]}'), (2, 'alice ng', 'north', DATE '2026-01-05', 80.50, 'gadget', 'b', '{"channel":"shop","items":[3]}'), (3, 'Bob Okafor', 'south', DATE '2026-01-05', 300.00, 'widget', 'a|c', '{"channel":"web","items":[4,5,6]}'), (4, 'Carla Díaz', 'east', DATE '2026-01-09', NULL, 'gizmo', NULL, '{"channel":"web","items":[]}'), (5, 'Bob Okafor', 'south', DATE '2026-01-12', 45.25, 'gadget', 'c', '{"channel":"phone","items":[7]}'), (6, 'Dev Patel', 'west', DATE '2026-01-12', 510.00, 'widget', 'a', '{"channel":"web","items":[8,9]}'), (7, 'Carla Diaz', 'east', DATE '2026-01-20', 99.99, 'gizmo', 'b|c', '{"channel":"shop","items":[10]}'), (8, 'Dev Patel', 'west', DATE '2026-02-02', 510.00, 'widget', 'a', '{"channel":"web","items":[8,9]}'), (9, 'Eve Larsen', NULL, DATE '2026-02-03', 15.00, 'gadget', NULL, '{"channel":"web","items":[11]}'), (10, 'Alice Ng', 'north', DATE '2026-02-10', 220.00, 'gizmo', 'a|b|c', '{"channel":"phone","items":[12,13]}') ) t(order_id, customer, region, order_date, amount, product, tags, meta); ``` Then run the statement: ```sql CREATE TEMP TABLE result AS SELECT order_id, order_date, amount, sum(amount) OVER w_run AS running_total, lag(amount) OVER (ORDER BY order_date, order_id) AS previous, round(avg(amount) OVER (ORDER BY order_date, order_id ROWS BETWEEN 2 PRECEDING AND CURRENT ROW), 2) AS moving_avg_3 FROM orders WINDOW w_run AS (ORDER BY order_date, order_id ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW); SELECT * FROM result; SELECT CASE WHEN ((SELECT max(running_total) FILTER (WHERE order_id = 10) = 1900.74 AND max(previous) FILTER (WHERE order_id = 2) = 120 AND max(moving_avg_3) FILTER (WHERE order_id = 3) = 166.83 FROM result)) THEN 'as expected' ELSE error('the running total, the previous value or the moving average is wrong') END AS verdict; ``` It needs nothing installed beyond DuckDB itself. ## Variants - Define the window: Set the partition, order and frame a window calculation runs over, or apply a general window step or function family. - [Repeat a group total on every row](https://meridian.online/operations/calculate-across-rows/group-total-on-every-row): Aggregate over the whole partition or table and put the result on every row, for shares of total and comparisons with the group. - [Compute a moving average](https://meridian.online/operations/calculate-across-rows/moving-average): Aggregate over a window of a fixed number of rows, or a span of time, that slides along with the current row. - [Take a value from another row](https://meridian.online/operations/calculate-across-rows/value-from-another-row): Bring a value from a row a fixed offset before or after the current one, or from the first, last or nth row of the window, often to compute a difference or percentage change. - [Compute a running total](https://meridian.online/operations/calculate-across-rows/running-total): Accumulate a sum, count, average, minimum or maximum from the first row of the partition down to the current row. - [Assign session ids](https://meridian.online/operations/calculate-across-rows/assign-session-ids): Number the sessions in ordered events, starting a new session whenever the gap between consecutive timestamps exceeds a limit. - [Group streaming rows into time windows](https://meridian.online/operations/calculate-across-rows/stream-time-windows): Assign rows of a stream to fixed, sliding or session windows of event time, so later steps emit one result per window. ## What other tools call it Meridian's classification; an independent blind rating agreed on 86.2% of 312 rows (exact class, version 2). - Azure Data Factory: [`Window`](https://learn.microsoft.com/en-us/azure/data-factory/data-flow-window) (read 2026-09-27) - Azure Data Factory: [`Window functions`](https://learn.microsoft.com/en-us/azure/data-factory/data-flow-window-functions) (read 2026-09-27) - Alteryx Designer: [`Multi-Row Formula`](https://help.alteryx.com/current/en/designer/tools/preparation/multi-row-formula-tool.html) (read 2026-09-27) - Alteryx Designer: [`Running Total`](https://help.alteryx.com/current/en/designer/tools/transform/running-total-tool.html) (read 2026-09-27) - Bruin: [`lag`](https://getbruin.com/docs/bruin/core-concepts/semantic-layer.html) (read 2026-09-27) - Bruin: [`lead`](https://getbruin.com/docs/bruin/core-concepts/semantic-layer.html) (read 2026-09-27) - Bruin: [`percent_of_total`](https://getbruin.com/docs/bruin/core-concepts/semantic-layer.html) (read 2026-09-27) - Bruin: [`running_total`](https://getbruin.com/docs/bruin/core-concepts/semantic-layer.html) (read 2026-09-27) - Apache DataFusion: [`WINDOW clause`](https://datafusion.apache.org/user-guide/sql/select.html) (read 2026-09-27) - Apache DataFusion: [`Window Functions: Custom Window`](https://datafusion.apache.org/user-guide/features.html) (read 2026-09-27) - Apache DataFusion: [`Window Functions: Empty (OVER())`](https://datafusion.apache.org/user-guide/features.html) (read 2026-09-27) - Apache DataFusion: [`Window Functions: Partitioning and ordering`](https://datafusion.apache.org/user-guide/features.html) (read 2026-09-27) - Apache DataFusion: [`first_value`](https://datafusion.apache.org/user-guide/sql/window_functions.html) (read 2026-09-27) - Apache DataFusion: [`lag`](https://datafusion.apache.org/user-guide/sql/window_functions.html) (read 2026-09-27) - Apache DataFusion: [`last_value`](https://datafusion.apache.org/user-guide/sql/window_functions.html) (read 2026-09-27) - Apache DataFusion: [`lead`](https://datafusion.apache.org/user-guide/sql/window_functions.html) (read 2026-09-27) - Apache DataFusion: [`nth_value`](https://datafusion.apache.org/user-guide/sql/window_functions.html) (read 2026-09-27) - Apache DataFusion: [`window`](https://docs.rs/datafusion/latest/datafusion/dataframe/struct.DataFrame.html) (read 2026-09-27) - DuckDB: [`WINDOW (clause)`](https://duckdb.org/docs/current/sql/query_syntax/window) (read 2026-09-27) - DuckDB: [`Window Functions (family)`](https://duckdb.org/docs/current/sql/functions/window_functions) (read 2026-09-27) - DuckDB: [`first_value`](https://duckdb.org/docs/current/sql/functions/window_functions) (read 2026-09-27) - DuckDB: [`lag`](https://duckdb.org/docs/current/sql/functions/window_functions) (read 2026-09-27) - DuckDB: [`last_value`](https://duckdb.org/docs/current/sql/functions/window_functions) (read 2026-09-27) - DuckDB: [`lead`](https://duckdb.org/docs/current/sql/functions/window_functions) (read 2026-09-27) - DuckDB: [`nth_value`](https://duckdb.org/docs/current/sql/functions/window_functions) (read 2026-09-27) - Duckle: [`Cumulative`](https://github.com/slothflowlabs/duckle/blob/f85f8960edfb6efbf4cb89d58a7b32e16df0e867/website/docs/components.html) (read 2026-09-25) - Duckle: [`First Value`](https://github.com/slothflowlabs/duckle/blob/f85f8960edfb6efbf4cb89d58a7b32e16df0e867/website/docs/components.html) (read 2026-09-25) - Duckle: [`Lag`](https://github.com/slothflowlabs/duckle/blob/f85f8960edfb6efbf4cb89d58a7b32e16df0e867/website/docs/components.html) (read 2026-09-25) - Duckle: [`Last Value`](https://github.com/slothflowlabs/duckle/blob/f85f8960edfb6efbf4cb89d58a7b32e16df0e867/website/docs/components.html) (read 2026-09-25) - Duckle: [`Lead`](https://github.com/slothflowlabs/duckle/blob/f85f8960edfb6efbf4cb89d58a7b32e16df0e867/website/docs/components.html) (read 2026-09-25) - Duckle: [`Sessionize`](https://github.com/slothflowlabs/duckle/blob/f85f8960edfb6efbf4cb89d58a7b32e16df0e867/frontend/src/workflow-ui/palette-data.ts) (read 2026-09-25) - Duckle: [`Tumbling Window`](https://github.com/slothflowlabs/duckle/blob/f85f8960edfb6efbf4cb89d58a7b32e16df0e867/frontend/src/workflow-ui/palette-data.ts) (read 2026-09-25) - Duckle: [`Window Aggregate`](https://github.com/slothflowlabs/duckle/blob/f85f8960edfb6efbf4cb89d58a7b32e16df0e867/website/docs/components.html) (read 2026-09-25) - EasyMorph: [`Distribute total`](https://help.easymorph.com/doku.php?id=transformations:distributetotal) (read 2026-09-27) - EasyMorph: [`Running total`](https://help.easymorph.com/doku.php?id=transformations:runningtotal) (read 2026-09-27) - EasyMorph: [`Shift column up/down`](https://help.easymorph.com/doku.php?id=transformations:shiftcolumn) (read 2026-09-27) - EasyMorph: [`Sliding aggregation`](https://help.easymorph.com/doku.php?id=transformations:slidingaggregation) (read 2026-09-27) - EasyMorph: [`Total/subtotals`](https://help.easymorph.com/doku.php?id=transformations:subtotal) (read 2026-09-27) - Apache Hop: [`Analytic Query`](https://hop.apache.org/manual/latest/pipeline/transforms/analyticquery.html) (read 2026-09-27) - Apache Hop: [`Beam timestamp`](https://hop.apache.org/manual/latest/pipeline/transforms/beamtimestamp.html) (read 2026-09-27) - Apache Hop: [`Beam window`](https://hop.apache.org/manual/latest/pipeline/transforms/beamwindow.html) (read 2026-09-27) - Ibis: [`Lag`](https://github.com/ibis-project/ibis/blob/05d2b293344e86cb41c1a426071734f7e270335a/ibis/expr/operations/analytic.py) (read 2026-09-27) - Ibis: [`Lead`](https://github.com/ibis-project/ibis/blob/05d2b293344e86cb41c1a426071734f7e270335a/ibis/expr/operations/analytic.py) (read 2026-09-27) - Ibis: [`NthValue`](https://github.com/ibis-project/ibis/blob/05d2b293344e86cb41c1a426071734f7e270335a/ibis/expr/operations/analytic.py) (read 2026-09-27) - Ibis: [`WindowBoundary`](https://github.com/ibis-project/ibis/blob/05d2b293344e86cb41c1a426071734f7e270335a/ibis/expr/operations/window.py) (read 2026-09-27) - Ibis: [`WindowFunction`](https://github.com/ibis-project/ibis/blob/05d2b293344e86cb41c1a426071734f7e270335a/ibis/expr/operations/window.py) (read 2026-09-27) - KNIME Analytics Platform: [`Lag Column`](https://api.hub.knime.com/nodes/*RurwVi1VODgLDTQP?details=full) (read 2026-09-27) - KNIME Analytics Platform: [`Moving Aggregator`](https://api.hub.knime.com/nodes/*JKPnK49gCJ_6tVwe?details=full) (read 2026-09-27) - KNIME Analytics Platform: [`Moving Average`](https://api.hub.knime.com/nodes/*i6a4eZBqe7EBhz9G?details=full) (read 2026-09-27) - Apache NiFi: [`AttributeRollingWindow`](https://nifi.apache.org/components/org.apache.nifi.processors.stateful.analysis.AttributeRollingWindow/) (read 2026-09-27) - OpenRefine: [`facetCount(choiceValue, s facetExpression, s columnName)`](https://openrefine.org/docs/manual/grelfunctions#other-functions) (read 2026-09-27) - Pentaho Data Integration: [`Analytic query`](https://docs.pentaho.com/pdia-data-integration/9.3-data-integration/pdi-transformation-steps-reference-overview) (read 2026-09-27) - Polars: [`DataFrame.rolling`](https://docs.pola.rs/api/python/stable/reference/dataframe/modify_select.html) (read 2026-09-27) - Polars: [`DataFrame.shift`](https://docs.pola.rs/api/python/stable/reference/dataframe/modify_select.html) (read 2026-09-27) - Polars: [`Expr.cum_count`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.cum_max`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.cum_min`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.cum_prod`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.cum_sum`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.cumulative_eval`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.diff`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.ewm_mean`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.ewm_mean_by`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.ewm_std`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.ewm_sum`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.ewm_sum_by`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.ewm_var`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.over`](https://docs.pola.rs/api/python/stable/reference/expressions/window.html) (read 2026-09-27) - Polars: [`Expr.pct_change`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling`](https://docs.pola.rs/api/python/stable/reference/expressions/window.html) (read 2026-09-27) - Polars: [`Expr.rolling_kurtosis`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_map`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_max`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_max_by`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_mean`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_mean_by`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_median`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_median_by`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_min`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_min_by`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_quantile`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_quantile_by`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_rank`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_rank_by`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_skew`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_std`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_std_by`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_sum`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_sum_by`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_var`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.rolling_var_by`](https://docs.pola.rs/api/python/stable/reference/expressions/computation.html) (read 2026-09-27) - Polars: [`Expr.shift`](https://docs.pola.rs/api/python/stable/reference/expressions/modify_select.html) (read 2026-09-27) - Polars: [`SQL functions: Window (group)`](https://docs.pola.rs/api/python/stable/reference/sql/functions/window.html) (read 2026-09-27) - Polars: [`cum_count`](https://docs.pola.rs/api/python/stable/reference/expressions/functions.html) (read 2026-09-27) - Polars: [`cum_fold`](https://docs.pola.rs/api/python/stable/reference/expressions/functions.html) (read 2026-09-27) - Polars: [`cum_reduce`](https://docs.pola.rs/api/python/stable/reference/expressions/functions.html) (read 2026-09-27) - Polars: [`cum_sum`](https://docs.pola.rs/api/python/stable/reference/expressions/functions.html) (read 2026-09-27) - Polars: [`cum_sum_horizontal`](https://docs.pola.rs/api/python/stable/reference/expressions/functions.html) (read 2026-09-27) - Polars: [`rolling_corr`](https://docs.pola.rs/api/python/stable/reference/expressions/functions.html) (read 2026-09-27) - Polars: [`rolling_cov`](https://docs.pola.rs/api/python/stable/reference/expressions/functions.html) (read 2026-09-27) - RapidMiner Studio: [`Generate Session ID`](https://docs.rapidminer.com/latest/studio/operators/extensions/Operator%20Toolbox/blending/attribute_generation/generate_session_id.html) (read 2026-09-27) - RapidMiner Studio: [`Lag`](https://docs.rapidminer.com/latest/studio/operators/modeling/time_series/transformation/lag_series_with_default_lag.html) (read 2026-09-27) - RapidMiner Studio: [`Moving Average Filter`](https://docs.rapidminer.com/latest/studio/operators/modeling/time_series/transformation/moving_average_filter.html) (read 2026-09-27) - RapidMiner Studio: [`Windowing`](https://docs.rapidminer.com/latest/studio/operators/modeling/time_series/windowing/windowing.html) (read 2026-09-27) - Tableau Prep: [`Difference From`](https://help.tableau.com/current/prep/en-us/prep_multirow_calculations.htm) (read 2026-09-27) - Tableau Prep: [`Fixed LOD`](https://help.tableau.com/current/prep/en-us/prep_calculations.htm) (read 2026-09-27) - Tableau Prep: [`LOOKUP`](https://help.tableau.com/current/prep/en-us/prep_function_reference.htm) (read 2026-09-27) - Tableau Prep: [`Moving Calculation`](https://help.tableau.com/current/prep/en-us/prep_multirow_calculations.htm) (read 2026-09-27) - Tableau Prep: [`Percent Difference From`](https://help.tableau.com/current/prep/en-us/prep_multirow_calculations.htm) (read 2026-09-27) - Tableau Prep: [`RUNNING_AVG`](https://help.tableau.com/current/prep/en-us/prep_function_reference.htm) (read 2026-09-27) - Tableau Prep: [`RUNNING_SUM`](https://help.tableau.com/current/prep/en-us/prep_function_reference.htm) (read 2026-09-27) - Tableau Prep: [`Running Calculation`](https://help.tableau.com/current/prep/en-us/prep_multirow_calculations.htm) (read 2026-09-27) - Tableau Prep: [`{ FIXED }`](https://help.tableau.com/current/prep/en-us/prep_function_reference.htm) (read 2026-09-27) - Tableau Prep: [`{ PARTITION }`](https://help.tableau.com/current/prep/en-us/prep_function_reference.htm) (read 2026-09-27) - Talend: [`tMemorizeRows`](https://help.qlik.com/talend/en-US/components/8.0/tmemorizerows/tmemorizerows-component) (read 2026-09-27) - Talend: [`tWindow`](https://help.qlik.com/talend/en-US/components/8.0/processing/processing-component) (read 2026-09-27) - Trifacta: [`NEXT Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`PREV Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`ROLLINGAVERAGE Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`ROLLINGCOUNTA Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`ROLLINGKTHLARGEST Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`ROLLINGKTHLARGESTUNIQUE Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`ROLLINGLIST Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`ROLLINGMAX Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`ROLLINGMAXDATE Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`ROLLINGMIN Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`ROLLINGMINDATE Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`ROLLINGMODE Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`ROLLINGMODEDATE Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`ROLLINGSTDEV Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`ROLLINGSTDEVSAMP Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`ROLLINGSUM Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`ROLLINGVAR Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`ROLLINGVARSAMP Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`SESSION Function`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/window-functions.html) (read 2026-09-27) - Trifacta: [`Window`](https://help.alteryx.com/aac/en/trifacta-classic/reference/transformation-reference.html) (read 2026-09-27) - Trifacta: [`Window Transform`](https://help.alteryx.com/aac/en/trifacta-classic/wrangle-language/language-appendices/transforms.html) (read 2026-09-27) - VisiData: [`addcol-aggregate`](https://github.com/saulpw/visidata/blob/7609212ec2febafa9caba7183cbebfaf49627909/visidata/aggregators.py#L412) (read 2026-09-23) - VisiData: [`addcol-delta`](https://github.com/saulpw/visidata/blob/7609212ec2febafa9caba7183cbebfaf49627909/visidata/experimental/rownum.py#L73) (read 2026-09-23) - VisiData: [`addcol-window`](https://github.com/saulpw/visidata/blob/7609212ec2febafa9caba7183cbebfaf49627909/visidata/features/window.py#L63) (read 2026-09-23)