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- Timestamp Types – DuckDB 15658
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...stamp Types Name Aliases Description TIMESTAMP_NS Naive timestamp with nanosecond precision TIMESTAMP DATETIME , TIMESTAMP WITHOUT TIME ZONE Naive timestamp with microsecond precision TIMESTAMP_MS Naive timestamp with millisecond precision TIMESTAMP_S N...0 SELECT TIMESTAMPTZ '1992-09-20 12:30:00.123456789+01:00' ; 1992-09-20 11:30:00.123456+00 DuckDB distinguishes timestamps WITHOUT TIME ZONE and WITH TIME ZONE (of which the only current representative is TIMESTAMP WITH TIME ZONE ). Despite the name, a...ime zone , which defaults to the system time zone and is just UTC+00:00 in the examples above. The corresponding TIMESTAMP WITHOUT TIME ZONE stores the same INT64 , but arithmetic, binning, and string formatting follow the straightforward rules of Coord... - https://man.mtool.work/duckdb/1.3/sql/data_types/timestamp.html
- TRY expression – DuckDB 11455
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...rror. The TRY expression was inspired by the TRY_CAST expression . Examples The following calls return errors when invoked without the TRY expression. When they are wrapped into as TRY expression, they return NULL : Casting Without TRY SELECT 'abc' :: I...Conversion Error: Could not convert string 'abc' to INT32 With TRY SELECT TRY ( 'abc' :: INTEGER ); NULL Logarithm on Zero Without TRY SELECT ln ( 0 ); Out of Range Error: cannot take logarithm of zero With TRY SELECT TRY ( ln ( 0 )); NULL Casting Multi...ple Rows Without TRY WITH cte AS ( FROM ( VALUES ( '123' ), ( 'test' ), ( '235' )) t ( a )) SELECT a :: INTEGER AS x FROM cte ; Conversion... - https://man.mtool.work/duckdb/1.3/sql/expressions/try.html
- Schema – DuckDB 10275
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...ent table at scale factor 300 . This table has approx. 554 million entries. In the first experiments, we create the schema without a primary key, then load the data. In the second experiment, we create the schema with a primary key, then load the data....In the third case, we create the schema without a primary key, load the data and then add the primary key constraint. In all cases, we take the data from .csv.gz files, a...nd measure the time required to perform the loading. Operation Execution time Load with primary key 461.6 s Load without primary key 121.0 s Load without primary key then add primary key 242.0 s For this data set, primary keys will only have a... - https://man.mtool.work/duckdb/1.3/guides/performance/schema.html
- LIMIT and OFFSET Clauses – DuckDB 9094
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...t which position to start reading the values, i.e., the first OFFSET values are ignored. Note that while LIMIT can be used without an ORDER BY clause, the results might not be deterministic without the ORDER BY clause. This can still be useful, however,...CT * FROM addresses LIMIT 10 % ; Syntax 関連キーワード addresses rows clause first table population Syntax position values without city Documentation Query Copy Markdown Clauses output modifier Logically applied query restricts amount fetched indicates... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/limit.html
- Window Functions – DuckDB 8925
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...ber 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...The relative rank of the current row: (rank() - 1) / (total partition rows - 1) . rank_dense() The rank of the current row without gaps . rank([ORDER BY ordering]) The rank of the current row with gaps; same as row_number of its first peer. row_number([...instead of the frame ordering. Return type DOUBLE Example cume_dist() dense_rank() Description The rank of the current row without gaps; this function counts peer groups. Return type BIGINT Example dense_rank() Aliases rank_dense() first_value(expr[ ORD... - https://man.mtool.work/duckdb/1.3/sql/functions/window_functions.html
- FROM and JOIN Clauses – DuckDB 8925
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...nother SELECT query inside a subquery node. DuckDB also has an optional FROM -first syntax which enables you to also query without a SELECT statement. Examples Select all columns from the table called table_name : SELECT * FROM table_name ; Select all c...ch left side row with at most one right side row. It can be specified as an OUTER join to find unpaired rows (e.g., trades without prices or prices which have no trades.) Attach prices or NULLs to stock trades: SELECT * FROM trades t ASOF LEFT JOIN pric...Self-Joins DuckDB allows self-joins for all types of joins. Note that tables need to be aliased, using the same table name without aliases will result in an error: CREATE TABLE t ( x INTEGER ); SELECT * FROM t JOIN t USING ( x ); Binder Error: Duplicate... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/from.html
- List Functions – DuckDB 8588
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...ce . list[begin:end:step] list_slice in bracket notation with an added step feature. array_pop_back(list) Returns the list without the last element. array_pop_front(list) Returns the list without the first element. flatten(list_of_lists) Concatenate a l...ements exist is both lists. list_intersect(list1, list2) Returns a list of all the elements that exist in both l1 and l2 , without duplicates. list_position(list, element) Returns the index of the element if the list contains the element. If the element...ded step feature. Example [4, 5, 6][:-:2] Result [4, 6] Alias list_slice array_pop_back(list) Description Returns the list without the last element. Example array_pop_back([4, 5, 6]) Result [4, 5] array_pop_front(list) Description Returns the list witho... - https://man.mtool.work/duckdb/1.3/sql/functions/list.html
- Subqueries – DuckDB 8082
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...or is generally the most useful as a correlated subquery to express antijoin operations. For example, to find Person nodes without an interest: CREATE TABLE Person ( id BIGINT , name VARCHAR ); CREATE TABLE interest ( PersonId BIGINT , topic VARCHAR );...here so far have been uncorrelated subqueries, where the subqueries themselves are entirely self-contained and can be run without the parent query. There exists a second type of subqueries called correlated subqueries. For correlated subqueries, the su...iltered out, as 9 <> 7 . Returning Each Row of the Subquery as a Struct Using the name of a subquery in the SELECT clause (without referring to a specific column) turns each row of the subquery into a struct whose fields correspond to the columns of the... - https://man.mtool.work/duckdb/1.3/sql/expressions/subqueries.html
- Profiling Queries – DuckDB 8082
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...DuckDB supports profiling queries via the EXPLAIN and EXPLAIN ANALYZE statements. EXPLAIN To see the query plan of a query without executing it, run: EXPLAIN query ; The output of EXPLAIN contains the estimated cardinalities for each operator. EXPLAIN A...r cardinalities Documentation Statements Copy Markdown Profiling Queries DuckDB supports profiling queries statements plan without executing output contains estimated profile statement runs shows actual 関連するページ Profiling DESCRIBE Statement SUMMAR... - https://man.mtool.work/duckdb/1.3/sql/statements/profiling.html
- Loops – DuckDB 7576
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...ds of thousands of SQL statements will slow down tests unnecessarily. Do not use loops for inserting data. Data Generation without Loops Loops should be used sparingly. While it might be tempting to use loops for inserting data using insert statements,...ssue © 2026 DuckDB Foundation, Amsterdam NL DuckDB Home Code of Conduct Trademark Use Blog In this article Data Generation without Loops... - https://man.mtool.work/duckdb/1.3/dev/sqllogictest/loops.html
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