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Nested Functions 13377
The following nested data types have dedicated function pages ( TUPLE values are handled by the STRUCT functions): Name Type page Functions page ARRAY ARRAY type ARRAY functions LIST LIST type LIST functions MAP MAP type MAP functions STRUC ...
https://man.mtool.work/duckdb/2.0/sql/functions/nested.html
Legacy Authentication Scheme for S3 API 9360
Prior to version 0.10.0, DuckDB did not have a Secrets manager . Hence, the configuration of and authentication to S3 endpoints was handled via variables. This page documents the legacy authentication scheme for the S3 API. Warning This pag ...
https://man.mtool.work/duckdb/2.0/core_extensions/httpfs/s3api_legacy_authentica...
SQLite Extension 8560
The SQLite extension allows DuckDB to directly read and write data from a SQLite database file. The data can be queried directly from the underlying SQLite tables. Data can be loaded from SQLite tables into DuckDB tables, or vice versa. Ins ... database at the same time, but only a single thread or process can write to the database at one time. Database locking is handled by the SQLite library, not DuckDB. Within the same process, SQLite uses mutexes. When accessed from different processes, S ...
https://man.mtool.work/duckdb/2.0/core_extensions/sqlite.html
Python Function API 8160
You can create a DuckDB user-defined function (UDF) from a Python function so it can be used in SQL queries. Similarly to regular functions , they need to have a name, a return type and parameter types. Creating Functions To register a Pyth ... native because it will be able to operate in batches. null_handling (optional): By default, NULL values are automatically handled as NULL -in NULL -out. Users can specify a desired behavior for NULL values by setting null_handling = 'special' . excepti ...
https://man.mtool.work/duckdb/2.0/clients/python/function.html
CSV Auto Detection 8160
When using read_csv , the system tries to automatically infer how to read the CSV file using the CSV sniffer . This step is necessary because CSV files are not self-describing and come in many different dialects. The auto-detection works ro ... s unsuccessful, the candidate type is removed from the set of candidate types for that column. After all samples have been handled – the remaining candidate type with the highest priority is chosen. The default set of candidate types is given below, in ...
https://man.mtool.work/duckdb/2.0/data/csv/auto_detection.html
Numeric Types 8160
Fixed-Width Integer Types The types TINYINT , SMALLINT , INTEGER , BIGINT and HUGEINT store whole numbers, that is, numbers without fractional components, of various ranges. Attempts to store values outside of the allowed range will result ... d evaluate your implementation carefully for corner cases (ranges, infinities, underflows, invalid operations) that may be handled differently from what you expect and you should familiarize yourself with common floating-point pitfalls. The article “Wha ...
https://man.mtool.work/duckdb/2.0/sql/data_types/numeric.html
ODBC Extension Functions 7761
odbc_begin_transaction odbc_bind_params odbc_close odbc_commit odbc_connect odbc_copy odbc_create_params odbc_list_data_sources odbc_list_drivers odbc_query odbc_rollback odbc_begin_transaction odbc_begin_transaction(conn_handle BIGINT) -> ... supports a number of options that can be used to change how the query parameters are passed and how the resulting data is handled. For known DBs these options are set automatically. They also can be passed as named parameters to odbc_query function to ...
https://man.mtool.work/duckdb/2.0/core_extensions/odbc/functions.html
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