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- Conversion between DuckDB and Python – DuckDB 15898
- This page is for DuckDB 1.3, which is outdated.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
...If the dict has a structure similar to: import duckdb my_map_dict = { "key" : [ 1 , 2 , 3 ], "value" : [ "one" , "two" , "three" ] } duckdb . values ( my_map_dict ) Then we'll convert it to a MAP of key-value pairs of the two lists zipped together. T...he example above becomes a MAP(INTEGER, VARCHAR) : ┌─────────────────────────┐ │ {1=one, 2=two, 3=three} │ │ map(integer, varchar) │ ├─────────────────────────┤ │ {1=one, 2=two, 3=three} │ └─────────────────────────┘ If the di...def get_map () -> dict [ str , list [ str ] | list [ int ]]: return { "key" : [ 1 , 2 , 3 ], "value" : [ "one" , "two" , "three" ] } duckdb_conn . create_function ( "get_map" , get_map , return_type = dict [ int , str ]) duckdb_conn . sql ( "select g... - https://man.mtool.work/duckdb/1.3/clients/python/conversion.html
- Union Type – DuckDB 9985
- This page is for DuckDB 1.3, which is outdated.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
...TE TABLE tbl1 ( u UNION ( num INTEGER , str VARCHAR )); INSERT INTO tbl1 VALUES ( 1 ), ( 'two' ), ( union_value ( str : = 'three' )); Any type can be implicitly cast to a UNION containing the type. Any UNION can also be implicitly cast to another UNIO...s unambiguous). UNION uses the member types' VARCHAR cast functions when casting to VARCHAR : SELECT u FROM tbl1 ; u 1 two three Select all the str members: SELECT union_extract ( u , 'str' ) AS str FROM tbl1 ; str NULL two three Alternatively, you ca...n use 'dot syntax' similarly to STRUCT s . SELECT u.str FROM tbl1 ; str NULL two three Select the currently active tag from the UNION as an ENUM . SELECT union_tag ( u ) AS t FROM tbl1 ; t num str str Union Ca... - https://man.mtool.work/duckdb/1.3/sql/data_types/union.html
- Data Ingestion – DuckDB 9860
- This page is for DuckDB 1.3, which is outdated.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
...mport duckdb import pandas as pd test_df = pd . DataFrame . from_dict ({ "i" : [ 1 , 2 , 3 , 4 ], "j" : [ "one" , "two" , "three" , "four" ]}) print ( duckdb . sql ( "SELECT * FROM test_df" ). fetchall ()) [(1, 'one'), (2, 'two'), (3, 'three'), (4, 'f...tionary = {} my_dictionary [ "test_df" ] = pd . DataFrame . from_dict ({ "i" : [ 1 , 2 , 3 , 4 ], "j" : [ "one" , "two" , "three" , "four" ]}) duckdb . register ( "test_df_view" , my_dictionary [ "test_df" ]) print ( duckdb . sql ( "SELECT * FROM test..._df_view" ). fetchall ()) [(1, 'one'), (2, 'two'), (3, 'three'), (4, 'four')] You can also create a persistent table in DuckDB from the contents of the DataFrame (or the view): # creat... - https://man.mtool.work/duckdb/1.3/clients/python/data_ingestion.html
- SQL on Apache Arrow – DuckDB 9314
- 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 con = duckdb . connect () my_arrow_table = pa . Table . from_pydict ({ 'i' : [ 1 , 2 , 3 , 4 ], 'j' : [ "one" , "two" , "three" , "four" ]}) # query the Apache Arrow Table "my_arrow_table" and return as an Arrow Table results = con . execute ( "SELE...e con = duckdb . connect () my_arrow_table = pa . Table . from_pydict ({ 'i' : [ 1 , 2 , 3 , 4 ], 'j' : [ "one" , "two" , "three" , "four" ]}) # create example Parquet files and save in a folder base_path = pathlib . Path ( tempfile . gettempdir ()) (...e con = duckdb . connect () my_arrow_table = pa . Table . from_pydict ({ 'i' : [ 1 , 2 , 3 , 4 ], 'j' : [ "one" , "two" , "three" , "four" ]}) # create example Parquet files and save in a folder base_path = pathlib . Path ( tempfile . gettempdir ()) (... - https://man.mtool.work/duckdb/1.3/guides/python/sql_on_arrow.html
- Window Functions – DuckDB 9049
- 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
...ate), orders each plant's partition by Date (to put the energy measurements next to each other), and uses a RANGE frame of three days on either side of each day for the avg (to handle any missing days). This is the result: Plant Date MWh 7-day Moving...Y "Plant" ORDER BY "Date" ASC RANGE BETWEEN INTERVAL 3 DAYS PRECEDING AND INTERVAL 3 DAYS FOLLOWING ) ORDER BY 1 , 2 ; The three window functions will also share the data layout, which will improve performance. Multiple windows can be defined in the s..." ) OVER seven AS "MWh 7-day Moving Average" , max ( "MWh" ) OVER seven AS "MWh 7-day Moving Maximum" , min ( "MWh" ) OVER three AS "MWh 3-day Moving Minimum" , avg ( "MWh" ) OVER three AS "MWh 3-day Moving Average" , max ( "MWh" ) OVER three AS "MWh... - https://man.mtool.work/duckdb/1.3/sql/functions/window_functions.html
- Directly Reading Files – DuckDB 8924
- 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
...se_path(filename) content 12 [test, sql, table_function, files, one.txt] Hello World! 2 [test, sql, table_function, files, three.txt] 42 10 [test, sql, table_function, files, two.txt] Foo Bar\nFöö Bär The file content is first validated to be valid UT...ql/table_function/files/four.blob 12 Hello World! test/sql/table_function/files/one.txt 2 42 test/sql/table_function/files/three.txt 10 F\xC3\xB6\xC3\xB6 B\xC3\xA4r test/sql/table_function/files/two.txt Schema The schemas of the tables returned by rea...ド read table files content size text blob filename column functions DuckDB glob last reads selected parse path Hello World three valid instead Documentation Guides Formats 関連するページ Caveats Reading and Writing Parquet Files Reading Multiple Files... - https://man.mtool.work/duckdb/1.3/guides/file_formats/read_file.html
- Prepared Statements – DuckDB 8924
- 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
...ed when the query is executed. This can improve readability and is useful for preventing SQL injections . Syntax There are three syntaxes for denoting parameters in prepared statements: auto-incremented ( ? ), positional ( $1 ), and named ( $param )....ient only supports auto-incremented parameters in prepared statements. Example Data Set In the following, we introduce the three different syntaxes and illustrate them with examples using the following table. CREATE TABLE person ( name VARCHAR , age B...ent example starts Prepared DuckDB supports syntaxes auto incremented Parameters Using follows parameter Syntax Statements three positional Note 関連するページ Prepared Statements Rust Client Enum Data Type Transaction Management Profiling Queries INS... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/prepared_statements.html
- Reading Faulty CSV Files – DuckDB 8643
- 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
...uld cause the faulty line to be skipped. For example, consider the following CSV file, faulty.csv : Pedro,31 Oogie Boogie, three If you read the CSV file, specifying that the first column is a VARCHAR and the second column is an INTEGER , loading the...file would fail, as the string three cannot be converted to an INTEGER . For example, the following query will throw a casting error. FROM read_csv ( 'faulty.c..._byte_position byte_position column_idx column_name error_type csv_line error_message 5 0 2 10 23 2 age CAST Oogie Boogie, three Error when converting column "age". Could not convert string " three" to 'INTEGER' 関連キーワード errors line date example... - https://man.mtool.work/duckdb/1.3/data/csv/reading_faulty_csv_files.html
- Interval Type – DuckDB 8378
- 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
...units. Units that aren't months , days , or microseconds are converted to equivalent amounts in the next smaller of these three basis units. SELECT INTERVAL 1 YEAR , -- single unit using YEAR keyword; stored as 12 months INTERVAL ( random () * 10 ) Y...precision, include the unit in the string or use a more granular unit; e.g., INTERVAL '1.5 years' or INTERVAL 18 MONTHS . Three basis units are necessary because a month does not correspond to a fixed amount of days (February has fewer days than Marc...ional units. To demonstrate this, the following query generates an INTERVAL called period by summing random amounts of the three basis units. It then extracts the aforementioned six parts from period , adds them back together, and confirms that the re... - https://man.mtool.work/duckdb/1.3/sql/data_types/interval.html
- Logical Operators – DuckDB 8253
- 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
.../ Expressions Copy Markdown Logical Operators The following logical operators are available: AND , OR and NOT . SQL uses a three-valuad logic system with true , false and NULL . Note that logical operators involving NULL do not always evaluate to NULL...関連キーワード operators evaluate Operators logical Documentation Expressions Copy Markdown Logical following available uses three valuad logic system Note involving always example Below complete truth tables Binary 関連するページ Expressions Comparison... - https://man.mtool.work/duckdb/1.3/sql/expressions/logical_operators.html
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