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- Aggregate Functions – DuckDB 13166
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...rg, val, n) The generalized case of arg_max for n values: returns a LIST containing the arg expressions for the top n rows ordered by val descending. This function is affected by ordering . arg_max_null(arg, val) Finds the row with the maximum val and c...ction is affected by ordering . arg_min(arg, val, n) Returns a LIST containing the arg expressions for the "bottom" n rows ordered by val ascending. This function is affected by ordering . arg_min_null(arg, val) Finds the row with the minimum val and ca.... This function is unaffected by distinctness . max(arg, n) Returns a LIST containing the arg values for the "top" n rows ordered by arg descending. max_by(arg, val) Finds the row with the maximum val . Calculates the arg expression at that row. This f... - https://man.mtool.work/duckdb/1.3/sql/functions/aggregates.html
- Indexing – DuckDB 12765
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...lock with a min-max range of 1000 to 2000 when comparing for = 123 or < 400 ). The Effect of Ordering on Zonemaps The more ordered the data within a column, the more valuable the zonemap indexes will be. For example, a column could contain a random numb...t to pre-order data by those columns when inserting it. Even an imperfect ordering will still be helpful. The best case of ordered data commonly arises with DATETIME columns. Microbenchmark: The Effect of Ordering For an example, let's repeat the microb...enchmark for timestamps with an ordered timestamp column using an ascending order vs. an unordered one. Column type Ordered Storage size Query time DATETIME yes 1... - https://man.mtool.work/duckdb/1.3/guides/performance/indexing.html
- Map Type – DuckDB 9282
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...itemap Live Demo Documentation / SQL / Data Types Copy Markdown Map Type MAP s are similar to STRUCT s in that they are an ordered list of key-value pairs. However, MAP s do not need to have the same keys present for each row, and thus are suitable for...G clauses, as well as for creating Boolean values . The ordering is defined positionally in the same way that words can be ordered in a dictionary. NULL values compare greater than all other values and are considered equal to each other. At the top leve...alue member. Functions See Map Functions . 関連キーワード values keys nested type types list comparison also using extract ordered need single Keys bracket Maps entries contained used compare rules member Functions Documentation Types 関連するページ Dat... - https://man.mtool.work/duckdb/1.3/sql/data_types/map.html
- Data Types – DuckDB 8499
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...nd has a different structure. Name Description Rules when used in a column Build from values Define in DDL/CREATE ARRAY An ordered, fixed-length sequence of data values of the same type. Each row must have the same data type within each instance of the...ARRAY and the same number of elements. [1, 2, 3] INTEGER[3] LIST An ordered sequence of data values of the same type. Each row must have the same data type within each instance of the LIST , but can... - https://man.mtool.work/duckdb/1.3/sql/data_types/overview.html
- ORDER BY Clause – DuckDB 8499
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...Ln' , 'Duck Town' , '11111' UNION ALL SELECT '111 Duck Duck Goose Ln' , 'Duck Town' , '11111-0001' ; Select the addresses, ordered by city name using the default NULL order and default order: SELECT * FROM addresses ORDER BY city ; Select the addresses,...ordered by city name in descending order with nulls at the end: SELECT * FROM addresses ORDER BY city DESC NULLS LAST ; Order by c... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/orderby.html
- Collations – DuckDB 8377
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...be sorted or compared in the execution engine. Collations are useful for localization, as the rules for how text should be ordered are different for different languages or for different countries. These orderings are often incompatible with one another....e when performing sorting and comparison operations. By default, the BINARY collation is used. That means that strings are ordered and compared based only on their binary contents. This makes sense for standard ASCII characters (i.e., the letters A-Z an... - https://man.mtool.work/duckdb/1.3/sql/expressions/collations.html
- Window Functions – DuckDB 8377
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...eed a number for each row in a table, you can use the rowid pseudocolumn . Generate a row_number column to enumerate rows, ordered by time : SELECT row_number () OVER ( ORDER BY time ) FROM sales ; Generate a row_number column to enumerate rows, ordered...indow functions and order-sensitive aggregate functions , and the order of framing are not well-defined. Each partition is ordered using the same ordering clause. Here is a table of power generation data, available as a CSV file ( power-plant-generation... - https://man.mtool.work/duckdb/1.3/sql/functions/window_functions.html
- FROM and JOIN Clauses – DuckDB 8115
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...+ ) { f ( t1 . a [ i ], t2 . b [ i ]); } It is difficult to express this in standard SQL because relational tables are not ordered, but imported tables such as data frames or disk files (like CSVs or Parquet files ) do have a natural ordering. Connectin...ast values in the shorter column) are set to NULL . As-Of Joins A common operation when working with temporal or similarly-ordered data is to find the nearest (first) event in a reference table (such as prices). This is called an as-of join: Attach pric... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/from.html
- AsOf Join – DuckDB 7732
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...ligned. Clocks may be slightly off, or there may be a delay between cause and effect. This can make connecting two sets of ordered data challenging. AsOf joins are a tool for solving this and other similar problems. One of the problems that AsOf joins a... - https://man.mtool.work/duckdb/1.3/guides/sql_features/asof_join.html
- Union Type – DuckDB 7732
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...cs as STRUCT s . The “tag” is always stored as the first struct entry, which ensures that the UNION types are compared and ordered by “tag” first. Functions See Union Functions . 関連キーワード types type cast members union implicitly member multiple al... - https://man.mtool.work/duckdb/1.3/sql/data_types/union.html
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