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- Lambda Functions – DuckDB 11429
- This page is for DuckDB 1.3, which is outdated.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
...Live Demo Documentation / SQL / Functions Copy Markdown Lambda Functions Deprecated DuckDB 1.3.0 deprecated the old lambda single arrow syntax ( x -> x + 1 ) in favor of the Python-style syntax ( lambda x : x + 1 ). DuckDB 1.3.0 also introduces a new s...etting to configure the lambda syntax. SET lambda_syntax = 'DEFAULT' ; SET lambda_syntax = 'ENABLE_SINGLE_ARROW' ; SET lambda_syntax = 'DISABLE_SINGLE_ARROW' ; Currently, DEFAULT enables both syntax styles, i.e., the old single...arrow syntax and the Python-style syntax. DuckDB 1.4.0 will be the last release supporting the single arrow syntax without explicitly enabling it. DuckDB 1.5.0 disables the single arrow syntax on default. DuckDB 1.6.0 remove... - https://man.mtool.work/duckdb/1.3/sql/functions/lambda.html
- Literal Types – DuckDB 10883
- This page is for DuckDB 1.3, which is outdated.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
...535 SELECT 1_2.1_2E0_1 ; -- 121.2 SELECT '0b0_1_0_1' :: INTEGER ; -- 5 String Literals String literals are delimited using single quotes ( ' , apostrophe) and result in STRING_LITERAL values. Note that double quotes ( " ) cannot be used as string delim...aracter: instead, double quotes are used to delimit quoted identifiers . Implicit String Literal Concatenation Consecutive single-quoted string literals separated only by whitespace that contains at least one newline are implicitly concatenated: SELECT...r at or near "' '" LINE 1: SELECT 'Hello' ' ' 'World' AS greeting; ^ Also note that implicit concatenation only works with single-quoted string literals, and does not work with other kinds of string values. Implicit String Conversion STRING_LITERAL ins... - https://man.mtool.work/duckdb/1.3/sql/data_types/literal_types.html
- ATTACH and DETACH Statements – DuckDB 10057
- This page is for DuckDB 1.3, which is outdated.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
...b ; Set the default database schema to new_db.my_schema : USE new_db.my_schema ; Resolving Conflicts When providing only a single qualification, the system can interpret this as either a catalog or a schema, as long as there are no conflicts. For examp...ll attached databases instead. While multiple transactions can be active at a time – the system only supports writing to a single attached database in a single transaction. If you try to write to multiple attached databases in a single transaction the...error will be thrown: Attempting to write to database "db2" in a transaction that has already modified database "db1" - a single transaction can only write to a single attached database. The reason for this restriction is that the system does not main... - https://man.mtool.work/duckdb/1.3/sql/statements/attach.html
- R – DuckDB 9778
- 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
.../ Building DuckDB Copy Markdown R This page contains instructions for building the R client library. The Build Only Uses a Single Thread Problem: By default, R compiles packages using a single thread, which causes the build to be slow. Solution: To par...following Documentation Development Building DuckDB Copy Markdown contains instructions building client library Build Uses Single Thread Problem default compiles packages single 関連するページ SET and RESET Statements Multiple Python Threads My Workloa...2026 DuckDB Foundation, Amsterdam NL DuckDB Home Code of Conduct Trademark Use Blog In this article The Build Only Uses a Single Thread... - https://man.mtool.work/duckdb/1.3/dev/building/r.html
- Avro Extension – DuckDB 9651
- 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
...a community extension in late 2024 and became a core extension in early 2025. The read_avro Function The extension adds a single DuckDB function, read_avro . This function can be used like so: FROM read_avro ( ' some_file .avro' ); This function will...ro' ); FROM read_avro ( 's3:// your-bucket / some_file .avro' ); should "just" work. You can also glob multiple files in a single read call or pass a list of files to the functions: FROM read_avro ( 'some_file_*.avro' ); FROM read_avro ([ 'some_file_1....,"null"] becomes a DuckDB INTEGER , which just happens to be NULL sometimes. Similarly, an Avro union that contains only a single type is converted to the type it contains. For example, an Avro record of the union type ["int"] also becomes a DuckDB INT... - https://man.mtool.work/duckdb/1.3/core_extensions/avro.html
- Concurrency – DuckDB 9092
- 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
...ing a combination of MVCC (Multi-Version Concurrency Control) and optimistic concurrency control (see Concurrency within a Single Process ), but all within that single writer process. The reason for this concurrency model is to allow for the caching of...is optimized for bulk operations, so executing many small transactions is not a primary design goal. Concurrency within a Single Process DuckDB supports concurrency within a single process according to the following rules. As long as there are no writ...ion, Amsterdam NL DuckDB Home Code of Conduct Trademark Use Blog In this article Handling Concurrency Concurrency within a Single Process Writing to DuckDB from Multiple Processes Optimistic Concurrency Control... - https://man.mtool.work/duckdb/1.3/connect/concurrency.html
- Struct Data Type – DuckDB 8965
- 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
...layout. The names of the struct entries are case-insensitive. STRUCT s are typically used to nest multiple columns into a single column, and the nested column can be of any type, including other STRUCT s and LIST s. STRUCT s are similar to PostgreSQL'..., ...} , using a row variable, or using the row function. Create a struct using the struct_pack function. Note the lack of single quotes around the keys and the use of the := operator: SELECT struct_pack ( key1 : = 'value1' , key2 : = 42 ) AS s ; Creat...space" FROM ( SELECT { 'x space' : 1 , 'y' : 2 , 'z' : 3 } AS a ); Bracket notation may also be used. Note that this uses single quotes ( ' ) since the goal is to specify a certain string key and only constant expressions may be used inside the bracke... - https://man.mtool.work/duckdb/1.3/sql/data_types/struct.html
- Reading Multiple Files – DuckDB 8826
- 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
...Read all files that match the glob pattern: SELECT * FROM 'test/*.parquet' ; Read three Parquet files and treat them as a single table: SELECT * FROM read_parquet ([ 'file1.parquet' , 'file2.parquet' , 'file3.parquet' ]); Read all Parquet files from t...*/*.parquet' ); Multi-File Reads and Globs DuckDB can also read a series of Parquet files and treat them as if they were a single table. Note that this only works if the Parquet files have the same schema. You can specify which Parquet files you want t...read_parquet function can accept a list of filenames as the input parameter. Read three Parquet files and treat them as a single table: SELECT * FROM read_parquet ([ 'file1.parquet' , 'file2.parquet' , 'file3.parquet' ]); Glob Syntax Any file name inp... - https://man.mtool.work/duckdb/1.3/data/multiple_files/overview.html
- CLI Client – DuckDB 8406
- 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
...CLI Client The latest version of the DuckDB CLI client is 1.5.6. Installation The DuckDB CLI (Command Line Interface) is a single, dependency-free executable. It is precompiled for Windows, Mac, and Linux for both the stable version and for nightly bui...edits to disk) and close. This will remove the .wal file (the write-ahead log ) and consolidate all of your data into the single-file database. Dot Commands In addition to SQL syntax, special dot commands may be entered into the CLI client. To use one...onal arguments to the command are entered, space separated, after the command. If an argument must contain a space, either single or double quotes may be used to wrap that parameter. Dot commands must be entered on a single line, and no whitespace may... - https://man.mtool.work/duckdb/1.3/clients/cli/overview.html
- Subqueries – DuckDB 8267
- 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
...ery constructs such as PIVOT can also appear as a subquery. Scalar Subquery Scalar subqueries are subqueries that return a single value. They can be used anywhere where an expression can be used. If a scalar subquery returns more than a single value, a...perator ( = ). Such direct comparisons only make sense with scalar subqueries. Scalar expressions can still be compared to single-column subqueries returning multiple rows by specifying a quantifier. Available quantifiers are ALL , ANY and SOME . The q...related subqueries, the subquery uses values from the parent subquery. Conceptually, the subqueries are run once for every single row in the parent query. Perhaps a simple way of envisioning this is that the correlated subquery is a function that is ap... - https://man.mtool.work/duckdb/1.3/sql/expressions/subqueries.html
DuckDB 1.3 Documentation / man.mtool.work