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- List Functions – DuckDB 14088
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...for which the lambda function returns true. See the Lambda Functions page for more details. list_grade_up(list) Works like sort, but the results are the indexes that correspond to the position in the original list instead of the actual values. list_h...) Resizes the list to contain size elements. Initializes new elements with value or NULL if value is not set. list_reverse_sort(list) Sorts the elements of the list in reverse order. See the Sorting Lists section for more details about the NULL sorti.... list_slice(list, begin, end) Extract a sublist using slice conventions. Negative values are accepted. See slicing . list_sort(list) Sorts the elements of the list. See the Sorting Lists section for more details about the sorting order and the NULL... - https://man.mtool.work/duckdb/1.3/sql/functions/list.html
- Utility Functions – DuckDB 11644
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...herwise, return arg1 . count_if(x) Aggregate function; rows contribute 1 if x is true or a non-zero number, else 0. create_sort_key(parameters...) Constructs a binary-comparable sort key based on a set of input parameters and sort qualifiers. current...variable var . Only available in the command line client . hash(value) Returns a UBIGINT with the hash of the value . icu_sort_key(string, collator) Surrogate sort key used to sort special characters according to the specific locale. Collator parame...tion Aggregate function; rows contribute 1 if x is true or a non-zero number, else 0. Example count_if(42) Result 1 create_sort_key(parameters...) Description Constructs a binary-comparable sort key based on a set of input parameters and sort qualifi... - https://man.mtool.work/duckdb/1.3/sql/functions/utility.html
- Non-Deterministic Behavior – DuckDB 9253
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...you can use the ORDER BY ALL clause : SELECT * FROM ( SELECT 'A' AS x UNION SELECT 'B' AS x ) ORDER BY ALL ; You can also sort lists using list_sort : SELECT list_sort ( array_distinct ([ 'A' , 'A' , 'B' , NULL , NULL ])) AS i ORDER BY i ; It's also...terministic shuffling . 関連キーワード results different query deterministic cases determinism distinct multi also threads sort Operations DuckDB behavior semantics order threaded using ordering expected Working Around Determinism following Different... - https://man.mtool.work/duckdb/1.3/operations_manual/non-deterministic_behavior.h...
- ORDER BY Clause – DuckDB 9114
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.... Logically it is applied near the very end of the query (just prior to LIMIT or OFFSET , if present). The ORDER BY clause sorts the rows on the sorting criteria in either ascending or descending order. In addition, every order clause can specify whe...er ( NULLS FIRST or NULLS LAST , default is NULLS LAST ). ORDER BY ALL The ALL keyword indicates that the output should be sorted by every column in order from left to right. The direction of this sort may be modified using either ORDER BY ALL ASC or...ther expressions in the ORDER BY clause – it must be by itself. See examples below. NULL Order Modifier By default, DuckDB sorts ASC and NULLS LAST , i.e., the values are sorted in ascending order and NULL values are placed last. This is identical to... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/orderby.html
- SET and RESET Statements – DuckDB 8958
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...et the default collation for the session: SET SESSION default_collation = 'nocase' ; Set a Global Variable Set the default sort order globally: SET GLOBAL sort_order = 'desc' ; Set the default threads globally: SET GLOBAL threads = 4 ; Syntax SET upd...kDB option Configuration options used Statements statement provided specified scope memory limit current collation session sort order globally reset instance Documentation Copy 関連するページ Configuration Configuration Securing DuckDB ODBC API on Wi... - https://man.mtool.work/duckdb/1.3/sql/statements/set.html
- R-Tree Indexes – DuckDB 8023
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...p with a specific region of interest. Unfortunately, even though DuckDB's vectorized execution engine is pretty fast, this sort of operation does not scale very well to large datasets as it always requires a full table scan to check every row in the...ee. However, when the R-tree index is created on an already populated table, a special bottom up "bulk loading algorithm" (Sort-Tile-Recursive) is used, which divides all entries into an already balanced tree as the total number of required nodes can... - https://man.mtool.work/duckdb/1.3/core_extensions/spatial/r-tree_indexes.html
- Timestamp with Time Zone Functions – DuckDB 7953
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...t date and time (start of current transaction). timetz_byte_comparable(timetz) Converts a TIME WITH TIME ZONE to a UBIGINT sort key. to_timestamp(double) Converts seconds since the epoch to a timestamp with time zone. transaction_timestamp() Current...) Result 2022-10-08 12:44:46.122-07 timetz_byte_comparable(timetz) Description Converts a TIME WITH TIME ZONE to a UBIGINT sort key. Example timetz_byte_comparable('18:18:16.21-07:00'::TIMETZ) Result 2494691656335442799 to_timestamp(double) Descripti... - https://man.mtool.work/duckdb/1.3/sql/functions/timestamptz.html
- Relational API – DuckDB 7884
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...the relation object by the projection in project_expr select Project the relation object by the projection in project_expr sort Reorder the relation object by the provided expressions union Create the set union of this relation object with another re...t ( 1 ) Result ┌─────────────────┐ │ description │ │ varchar │ ├─────────────────┤ │ value is uneven │ └─────────────────┘ sort Signature sort ( self : duckdb . duckdb . DuckDBPyRelation , * args ) -> duckdb . duckdb . DuckDBPyRelation Description Re...ription, range as value, now() + concat(range,' ', 'minutes')::interval as created_timestamp from range(1, 10) """ ) rel . sort ( "description" ) Result ┌──────────────────────────────────────┬─────────────────┬───────┬────────────────────────────┐ │... - https://man.mtool.work/duckdb/1.3/clients/python/relational_api.html
- inet Extension – DuckDB 7815
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...8 4 fe80::/10 5 2001:db8:3c4d:15::1a2f:1a2b Operations on INET Values INET values can be compared naturally, and IPv4 will sort before IPv6. Additionally, IP addresses can be modified by adding or subtracting integers. CREATE TABLE tbl ( cidr INET );... - https://man.mtool.work/duckdb/1.3/core_extensions/inet.html
- Tuning Workloads – DuckDB 7815
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...operators in relational database systems. The main blocking operators are the following: grouping: GROUP BY joining: JOIN sorting: ORDER BY windowing: OVER ... (PARTITION BY ... ORDER BY ...) DuckDB supports larger-than-memory processing for all of...me aggregate functions , such as list() and string_agg() , do not support offloading to disk. Aggregate functions that use sorting are holistic, i.e., they need all inputs before the aggregation can start. As DuckDB cannot yet offload some complex in...s on remote parquet files when possible. DuckDB can use these filters to reduce the amount of data that is scanned. Either sort or partition data by columns that are regularly used for filters: this increases the effectiveness of the filters in reduc... - https://man.mtool.work/duckdb/1.3/guides/performance/how_to_tune_workloads.html
DuckDB 1.3 Documentation / man.mtool.work