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- Window Functions – DuckDB 13759
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...urpose Window Functions The table below shows the available general window functions. Name Description cume_dist([ORDER BY ordering]) The cumulative distribution: (number of partition rows preceding or peer with current row) / total partition rows. dense..._rank() The rank of the current row without gaps; this function counts peer groups. first_value(expr[ ORDER BY ordering][ IGNORE NULLS]) Returns expr evaluated at the row that is the first row (with a non-null value of expr if IGNORE NULLS is...set) of the window frame. lag(expr[, offset[, default]][ ORDER BY ordering][ IGNORE NULLS]) Returns expr evaluated at the row that is offset rows (among rows with a non-null value of expr if IGNORE... - https://man.mtool.work/duckdb/1.3/sql/functions/window_functions.html
- Aggregate Functions – DuckDB 12638
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...the function call. Note the lack of the comma separator before the clause. SELECT aggregate_function ( arg , sep ORDER BY ordering_criteria ); This clause ensures that the values being aggregated are sorted before applying the function. Most aggregate f...s parsed and discarded. However, there are some order-sensitive aggregates that can have non-deterministic results without ordering, e.g., first , last , list and string_agg / group_concat / listagg . These can be made deterministic by ordering the argum...te functions. Function Description any_value(arg) Returns the first non-null value from arg . This function is affected by ordering . arbitrary(arg) Returns the first value (null or non-null) from arg . This function is affected by ordering . arg_max(arg... - https://man.mtool.work/duckdb/1.3/sql/functions/aggregates.html
- Indexing – DuckDB 8931
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...r value (e.g., it can omit a block 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 colum...pecific columns with selective filters, it is best 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...smaller storage size. It also allows the computation to be 1.5× faster. Ordered Integers Another practical way to exploit ordering is to use the INTEGER type with automatic increments rather than UUID for columns queried using selective filters. In a sc... - https://man.mtool.work/duckdb/1.3/guides/performance/indexing.html
- Pragmas – DuckDB 8655
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...ns: PRAGMA collations ; Set the default collation to one of the available ones: SET default_collation = 'nocase' ; Default Ordering for NULLs Set the default ordering for NULLs to be either NULLS_FIRST , NULLS_LAST , NULLS_FIRST_ON_ASC_LAST_ON_DESC or NU...fault_null_order = 'NULLS_FIRST' ; SET default_null_order = 'NULLS_LAST_ON_ASC_FIRST_ON_DESC' ; Set the default result set ordering direction to ASCENDING or DESCENDING : SET default_order = 'ASCENDING' ; SET default_order = 'DESCENDING' ; Ordering by No...n-Integer Literals By default, ordering by non-integer literals is not allowed: SELECT 42 ORDER BY 'hello world' ; -- Binder Error: ORDER BY non-integer literal h... - https://man.mtool.work/duckdb/1.3/configuration/pragmas.html
- Non-Deterministic Behavior – DuckDB 8310
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...Other factors, such as using different compilers, operating systems, and hardware architectures, can also cause changes in ordering. This page documents the cases where non-determinism is an expected behavior . If you would like to make your queries dete...rkarounds: Limit the number of threads to prevent non-determinism introduced by multi-threading. SET threads = 1 ; Enforce ordering. For example, you can use the ORDER BY ALL clause : SELECT * FROM ( SELECT 'A' AS x UNION SELECT 'B' AS x ) ORDER BY ALL ;...deterministic cases determinism distinct multi also threads sort Operations DuckDB behavior semantics order threaded using ordering expected Working Around Determinism following Different 関連するページ Result Verification Executing SQL in Python Overvie... - https://man.mtool.work/duckdb/1.3/operations_manual/non-deterministic_behavior.h...
- Array Type – DuckDB 8259
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..., y WHERE x.i = y.i ; Compute cosine similarity: SELECT array_cosine_similarity ( x.v , y.v ) FROM x , y WHERE x.i = y.i ; Ordering The ordering of ARRAY instances is defined using a lexicographical order. NULL values compare greater than all other value...rademark Use Blog In this article Creating Arrays Defining an Array Field Retrieving Values from Arrays Functions Examples Ordering See Also... - https://man.mtool.work/duckdb/1.3/sql/data_types/array.html
- List Type – DuckDB 8259
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...][:2] ['a', 'b'] SELECT ['a', 'b', 'c'][-2:] ['b', 'c'] SELECT list_slice(['a', 'b', 'c'], 2, 3) ['b', 'c'] Comparison and Ordering The LIST type can be compared using all the comparison operators . These comparisons can be used in logical expressions su...ch as WHERE and HAVING clauses, and return BOOLEAN values . The LIST ordering is defined positionally using the following rules, where min_len = min(len(l1), len(l2)) . Equality. l1 and l2 are equal,...rdam NL DuckDB Home Code of Conduct Trademark Use Blog In this article Creating Lists Retrieving from Lists Comparison and Ordering Functions... - https://man.mtool.work/duckdb/1.3/sql/data_types/list.html
- FROM and JOIN Clauses – DuckDB 7983
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...les are not ordered, but imported tables such as data frames or disk files (like CSVs or Parquet files ) do have a natural ordering. Connecting them using this ordering is called a positional join: CREATE TABLE t1 ( x INTEGER ); CREATE TABLE t2 ( s VARCH...OIN prices p ON t.symbol = p.symbol AND t.when >= p.when ; The ASOF join requires at least one inequality condition on the ordering field. The inequality can be any inequality condition ( >= , > , <= , < ) on any data type, but the most common form is >=... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/from.html
- Configuration – DuckDB 7948
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...NT 262144 default_collation The collation setting used when none is specified VARCHAR default_null_order , null_order NULL ordering used when none is specified ( NULLS_FIRST or NULLS_LAST ) VARCHAR NULLS_LAST default_order The order type used when none i...shold The number of rows we need on either table to choose a nested loop join UBIGINT 5 order_by_non_integer_literal Allow ordering by non-integer literals - ordering by such literals has no effect. BOOLEAN false ordered_aggregate_threshold The number of... - https://man.mtool.work/duckdb/1.3/configuration/overview.html
- Result Verification – DuckDB 7897
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...uery I PRAGMA tpch ( 1 ) ---- < FILE > : extension / tpch / dbgen / answers / sf1 / q01.csv Row-Wise vs. Value-Wise Result Ordering The result values of a query can be either supplied in row-wise order, with the individual values separated by tabs, or in...demark Use Blog In this article NULL Values and Empty Strings Error Verification Regex File Row-Wise vs. Value-Wise Result Ordering Hashes and Outputting Values Result Sorting Query Labels... - https://man.mtool.work/duckdb/1.3/dev/sqllogictest/result_verification.html
DuckDB 1.3 Documentation / man.mtool.work