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- Importing Data – DuckDB 14433
- This page is for DuckDB 1.3, which is outdated.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 can directly connect to many popular data sources and offers several data ingestion methods that allow you to easily and efficiently fill up the database. On this page, we provide an overview of these methods so you can select which one is best suited for...earch_path is not set, the working directory is used as the basis for relative paths. File Formats CSV Loading Data can be efficiently loaded from CSV files using several methods. The simplest is to use the CSV file's name: SELECT * FROM 'test.csv' ; Altern...LE test AS SELECT * FROM 'test.csv' ; For more details, see the page on CSV loading . Parquet Loading Parquet files can be efficiently loaded and queried using their filename: SELECT * FROM 'test.parquet' ; Alternatively, use the read_parquet function : SEL... - https://man.mtool.work/duckdb/1.3/data/overview.html
- Execution Format – DuckDB 9268
- This page is for DuckDB 1.3, which is outdated.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
...quence Vectors Sequence vectors are physically stored as an offset and an increment value. Sequence vectors are useful for efficiently storing incremental sequences. They are generally emitted for row identifiers. Unified Vector Format These properties of t...ric view over the contents of the Vector. Every type of Vector can convert to this format. Complex Types String Vectors To efficiently store strings, we make use of our string_t class. struct string_t { union { struct { uint32_t length ; char prefix [ 4 ];... - https://man.mtool.work/duckdb/1.3/internals/vector.html
- Constraints – DuckDB 9268
- This page is for DuckDB 1.3, which is outdated.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
...Constraint Error: Duplicate key "id: 1, name: Student 1" violates primary key constraint In order to enforce this property efficiently, an ART index is automatically created for every primary key or unique constraint that is defined in the table. Primary ke...olates foreign key constraint because key "id: 2" does not exist in the referenced table In order to enforce this property efficiently, an ART index is automatically created for every foreign key constraint that is defined in the table. Warning Indexes have... - https://man.mtool.work/duckdb/1.3/sql/constraints.html
- Friendly SQL – DuckDB 9073
- 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
...s max(arg, n) , min(arg, n) , arg_max(arg, val, n) , arg_min(arg, val, n) , max_by(arg, val, n) and min_by(arg, val, n) to efficiently return the "top" n rows in a group based on a specific column in either ascending or descending order. For example, let's...│ [3, 2, 1] │ a │ │ [6, 5, 4] │ b │ └───────────────────┴─────────┘ But in DuckDB, we can do this much more concisely (and efficiently!): SELECT max ( val , 3 ) FROM t1 GROUP BY grp ; ┌─────────────┐ │ max(val, 3) │ │ int32[] │ ├─────────────┤ │ [3, 2, 1] │... - https://man.mtool.work/duckdb/1.3/sql/dialect/friendly_sql.html
- Loops – DuckDB 8277
- 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
...e two functions, together with clever use of cross products and other expressions, many different types of datasets can be efficiently generated. The random() function can also be used to generate random data. An alternative option is to read data from an e... - https://man.mtool.work/duckdb/1.3/dev/sqllogictest/loops.html
- Python API – DuckDB 8065
- 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
...w_table" ) ┌───────┐ │ a │ │ int64 │ ├───────┤ │ 42 │ └───────┘ Result Conversion DuckDB supports converting query results efficiently to a variety of formats. See the result conversion page for more information. import duckdb duckdb . sql ( "SELECT 42" ).... - https://man.mtool.work/duckdb/1.3/clients/python/overview.html
- Hugging Face Support – DuckDB 8065
- 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
...SELECT count ( * ) AS count FROM 'hf://datasets/cais/mmlu/astronomy/*.parquet' ; count 173 By using glob patterns, you can efficiently handle large datasets and perform comprehensive queries across multiple files, simplifying your data inspections and proce... - https://man.mtool.work/duckdb/1.3/core_extensions/httpfs/hugging_face.html
- Environment – DuckDB 8065
- 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
...ocuses on the effects of the hardware configuration and the operating system used. Hardware Configuration CPU DuckDB works efficiently on both AMD64 (x86_64) and ARM64 (AArch64) CPU architectures. Memory Bestpractice Aim for 1-4 GB memory per thread. Minimu... - https://man.mtool.work/duckdb/1.3/guides/performance/environment.html
- Jupyter Notebooks – DuckDB 8065
- 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
...e. This delegates memory management to the engine and ensures that intermediate computations do not keep eating up memory, efficiently plotting massive datasets. Boxplot & Histogram To create a boxplot, call %sqlplot boxplot , passing the name of the table... - https://man.mtool.work/duckdb/1.3/guides/python/jupyter.html
- Conversion between DuckDB and Python – DuckDB 7871
- 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
...esult Conversion: DuckDB Results to Python DuckDB's Python client provides multiple additional methods that can be used to efficiently retrieve data. NumPy fetchnumpy() fetches the data as a dictionary of NumPy arrays Pandas df() fetches the data as a Panda... - https://man.mtool.work/duckdb/1.3/clients/python/conversion.html
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