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- Non-Deterministic Behavior 11228
- Several operators in DuckDB exhibit non-deterministic behavior. Most notably, SQL uses set semantics, which allows results to be returned in a different order. DuckDB exploits this to improve performance, particularly when performing multi-
...u may get two different results: SELECT * FROM ( SELECT 'A' AS x UNION SELECT 'B' AS x ); Both results A , B and B , A are correct. Different Results on Different Platforms: array_distinct The array_distinct function may return results in a different...oating-point inaccuracies may produce different results when run in multi-threaded configurations: For example, stddev and corr may produce non-deterministic results : CREATE TABLE tbl AS SELECT 'ABCDEFG'[floor(random() * 7 + 1)::INT] AS s, 3.7 AS x,...i AS y FROM range(1, 1_000_000) r(i); SELECT s, stddev(x) AS standard_deviation, corr(x, y) AS correlation FROM tbl GROUP BY s ORDER BY s; The expected standard deviations and correlations from this query are... - https://man.mtool.work/duckdb/2.0/operations_manual/non-deterministic_behavior.h...
- Aggregate Functions 7485
- Examples Produce a single row containing the sum of the amount column: SELECT sum(amount) FROM sales; Produce one row per unique region, containing the sum of amount for each group: SELECT region, sum(amount) FROM sales GROUP BY region; Ret
...it_xor(arg) Returns the bitwise XOR of all bits in a given expression. bitstring_agg(arg) Returns a bitstring whose length corresponds to the range of the non-null (integer) values, with bits set at the location of each (distinct) value. bool_and(arg...arg, boundaries) Returns a MAP of key-value pairs representing the provided upper boundaries and counts of elements in the corresponding bins (left-open and right-closed partitions) of the datatype. A boundary at the largest value of the datatype is...eighted_avg(arg, weight) Calculates the weighted average of all non-null values in arg , where each value is scaled by its corresponding weight . If weight is NULL , the corresponding arg value will be skipped. This function is affected by ordering .... - https://man.mtool.work/duckdb/2.0/sql/functions/aggregates.html
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