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- Window Functions – DuckDB 12487
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...e partition. RANGE Framing Returning to the power data, suppose the data is noisy. We might want to compute a 7 day moving average for each plant to smooth out the noise. To do this, we can use this window query: SELECT "Plant" , "Date" , avg ( "MWh" )...Y "Plant" ORDER BY "Date" ASC RANGE BETWEEN INTERVAL 3 DAYS PRECEDING AND INTERVAL 3 DAYS FOLLOWING ) AS "MWh 7-day Moving Average" FROM "Generation History" ORDER BY 1 , 2 ; This query partitions the data by Plant (to keep the different power plants' d...days on either side of each day for the avg (to handle any missing days). This is the result: Plant Date MWh 7-day Moving Average Boston 2019-01-02 517450.75 Boston 2019-01-03 508793.20 Boston 2019-01-04 508529.83 … … … Boston 2019-01-13 499793.00 Worc... - https://man.mtool.work/duckdb/1.3/sql/functions/window_functions.html
- Aggregate Functions – DuckDB 11780
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...arg) Returns a LIST containing all the values of a column. This function is affected by ordering . avg(arg) Calculates the average of all non-null values in arg . bit_and(arg) Returns the bitwise AND of all bits in a given expression. bit_or(arg) Return...non- NULL values in arg . countif(arg) Returns the number of rows in a group where arg is true . favg(arg) Calculates the average using a more accurate floating point summation (Kahan Sum). first(arg) Returns the first value (null or non-null) from arg...ates the sum using a more accurate floating point summation (Kahan Sum). weighted_avg(arg, weight) Calculates the weighted average all non-null values in arg , where each value is scaled by its corresponding weight . If weight is NULL , the correspondin... - https://man.mtool.work/duckdb/1.3/sql/functions/aggregates.html
- HAVING Clause – DuckDB 10541
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...ities with a count below 50: SELECT city , count ( * ) FROM addresses GROUP BY city HAVING count ( * ) >= 50 ; Compute the average income per city per street_name , filtering out cities with an average income bigger than twice the median income : SELECT...( income ); Syntax 関連キーワード clause city income after grouping addresses count street Syntax occurs filtering cities average median Documentation Query Copy Markdown Clause used provide filter criteria completed terms 関連するページ GROUP BY Claus... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/having.html
- GROUPING SETS – DuckDB 9109
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...ultiple dimensions within the same query. Note that this syntax is not compatible with GROUP BY ALL . Examples Compute the average income along the provided four different dimensions: -- the syntax () denotes the empty set (i.e., computing an ungrouped...avg ( income ) FROM addresses GROUP BY GROUPING SETS (( city , street_name ), ( city ), ( street_name ), ()); Compute the average income along the same dimensions: SELECT city , street_name , avg ( income ) FROM addresses GROUP BY CUBE ( city , street_...name ); Compute the average income along the dimensions (city, street_name) , (city) and () : SELECT city , street_name , avg ( income ) FROM addresse... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/grouping_sets.html
- GROUP BY Clause – DuckDB 8932
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...e addresses table that belong to each different city: SELECT city , count ( * ) FROM addresses GROUP BY city ; Compute the average income per city per street_name: SELECT city , street_name , avg ( income ) FROM addresses GROUP BY city , street_name ; G...y city and street_name to remove any duplicate values: SELECT city , street_name FROM addresses GROUP BY ALL ; Compute the average income per city per street_name. Since income is wrapped in an aggregate function, do not include it in the GROUP BY : SEL... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/groupby.html
- Relational API – DuckDB 8755
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...he row with the minimum value for a value column and returns the value of that row for an argument column avg Computes the average on a given column bit_and Computes the bitwise AND of all bits present in a given column bit_or Computes the bitwise OR of...k Computes the dense rank within the partition distinct Retrieve distinct rows from this relation object favg Computes the average of all values present in a given column using a more accurate floating point summation (Kahan Sum) first Returns the first...containing all values present in a given column max Returns the maximum value present in a given column mean Computes the average on a given column median Computes the median over all values present in a given column min Returns the minimum value prese... - https://man.mtool.work/duckdb/1.3/clients/python/relational_api.html
- Python Client API – DuckDB 7694
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...roups : str = '' , window_spec : str = '' , projected_columns : str = '' ) → duckdb.duckdb.DuckDBPyRelation ¶ Computes the average on a given column Detailed examples can be found at Relational API page . bit_and ( self : duckdb.duckdb.DuckDBPyRelation...roups : str = '' , window_spec : str = '' , projected_columns : str = '' ) → duckdb.duckdb.DuckDBPyRelation ¶ Computes the average of all values present in a given column using a more accurate floating point summation (Kahan Sum) Detailed examples can b...roups : str = '' , window_spec : str = '' , projected_columns : str = '' ) → duckdb.duckdb.DuckDBPyRelation ¶ Computes the average on a given column Detailed examples can be found at Relational API page . median ( self : duckdb.duckdb.DuckDBPyRelation ,... - https://man.mtool.work/duckdb/1.3/clients/python/reference/
- PHP Client – DuckDB 7517
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...some amazing features. For example, you can query remote files directly. Let's use an aggregate function to calculate the average of a column for a parquet remote file: DuckDB :: sql ( 'SELECT "Reporting Year", avg("Gas Produced, MCF") as "AVG Gas Prod... - https://man.mtool.work/duckdb/1.3/clients/php.html
- Schema – DuckDB 7517
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...or 300 . This table has approx. 554 million unordered timestamp values. We run a simple aggregation query that returns the average day-of-the month from the timestamps in two configurations. First, we use a DATETIME to encode the values and run the quer... - https://man.mtool.work/duckdb/1.3/guides/performance/schema.html
- Loading JSON – DuckDB 7340
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...e_threshold The JSON reader divides the number of appearances of each JSON field by the auto-detection sample size. If the average over the fields of an object is less than this threshold, it will default to using a MAP type with value type of merged fi... - https://man.mtool.work/duckdb/1.3/data/json/loading_json.html
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