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- ATTACH and DETACH Statements 17220
- DuckDB allows attaching to and detaching from database files. Examples Attach the database file.db with the alias inferred from the name ( file ): ATTACH 'file.db'; Attach the database file.db with an explicit alias ( file_db ): ATTACH 'fil
...te database for reading and writing (see the sqlite extension for more information): ATTACH 'sqlite_file.db' AS sqlite_db (TYPE sqlite); Attach the database file.db if inferred database alias file does not yet exist: ATTACH IF NOT EXISTS 'file.db'; A...ists: ATTACH OR REPLACE 'file2.db' AS file_db; Create a table in the attached database with alias file : CREATE TABLE file.new_table (i INTEGER); Detach the database with alias file : DETACH file; Show a list of all attached databases: SHOW DATABASE...S; Change the default database that is used to the database file : USE file; ATTACH The ATTACH statement adds a new database file to the catalog that can be read from and written to. Note that attachment definitions are not persisted betw... - https://man.mtool.work/duckdb/2.0/sql/statements/attach.html
- ALTER TABLE Statement 14838
- The ALTER TABLE statement changes the schema of an existing table in the catalog. Examples CREATE TABLE integers (i INTEGER, j INTEGER); Add a new column with name k to the table integers , it will be filled with the default value NULL : AL
...TER TABLE integers ADD COLUMN k INTEGER; Add a new column with name l to the table integers, it will be filled with the default value 10: ALTER TABLE integers ADD COLUMN l I...NTEGER DEFAULT 10; Drop the column k from the table integers: ALTER TABLE integers DROP k; Change the type of the column i to the type VARCHAR using a standard cast: ALTER TABLE integers ALTER i TYPE VARCHAR; Change the type of t...he column i to the type VARCHAR , using the specified expression to convert the data for each row: ALTER TABLE integers ALTER i SET DATA TYPE VARC... - https://man.mtool.work/duckdb/2.0/sql/statements/alter_table.html
- CREATE TYPE Statement 14250
- The CREATE TYPE statement defines a new type in the catalog. Examples Create a simple ENUM type: CREATE TYPE mood AS ENUM ('happy', 'sad', 'curious'); Create a simple STRUCT type: CREATE TYPE many_things AS STRUCT(k INTEGER, l VARCHAR); Cre
...ate a simple UNION type: CREATE TYPE one_thing AS UNION(number INTEGER, string VARCHAR); Create a type alias: CREATE TYPE x_index AS INTEGER; Repl...ace an existing type: CREATE OR REPLACE TYPE mood AS ENUM ('cheerful', 'gloomy'); Syntax The CREATE TYPE clause defines a new data type availab...le to this DuckDB instance. Use the OR REPLACE modifier to redefine a type that already exists. These new types can then be inspected in the duckdb_types table . Limitations Extending types to support custom operators (such as t... - https://man.mtool.work/duckdb/2.0/sql/statements/create_type.html
- Complete API 14013
- This page contains the reference for DuckDB's C API. The reference contains several deprecation notices. These concern methods whose long-term availability is not guaranteed as they may be removed in the future. That said, DuckDB's develope
...base , duckdb_connection * out_connection ); void duckdb_interrupt ( duckdb_connection connection ); duckdb_query_progress_type duckdb_query_progress ( duckdb_connection connection ); void duckdb_disconnect ( duckdb_connection * connection ); void du...oid duckdb_destroy_config ( duckdb_config * config ); Error Data duckdb_error_data duckdb_create_error_data ( duckdb_error_type type , const char * message ); void duckdb_destroy_error_data ( duckdb_error_data * error_data ); duckdb_error_type duckdb...uckdb_client_context context , duckdb_expression expr , duckdb_value * out_value ); duckdb_create_instance_cache Creates a new database instance cache. The instance cache is necessary if a client/program (re)opens multiple databases to the same file... - https://man.mtool.work/duckdb/2.0/clients/c/api.html
- PHP Client 13973
- The DuckDB PHP client is a tertiary client and is maintained by a third-party. Client API for PHP, focused on performance. The DuckDB PHP client uses the official C API internally through FFI , achieving good benchmark results. This library
...8.3 or higher. Full documentation is available at https://duckdb-php.readthedocs.io/ . Automatic Install (Recommended for Newcomers) composer require satur.io/duckdb-auto You will need to allow satur.io/duckdb-auto to execute code to use this insta...umn | ------------------- | quack | ------------------- The function we used here, DuckDB::sql() , performs the query in a new in-memory database which is destroyed after retrieving the result. This is not the most common use case, let's see how to...--------------------------------------------------------------------------------------------------- | column_name | column_type | min | max | approx_unique | avg | std | q25 | q50 | q75 | count | null_percentage | ------------------------------------... - https://man.mtool.work/duckdb/2.0/clients/tertiary_clients/php.html
- Instantiate 13962
- Overview DuckDB-Wasm can be instantiated in several ways, depending on how your application bundles and serves its assets. Each approach resolves the mainModule (the WebAssembly file) and the mainWorker (the worker script) for the browser's
...ased on browser checks const bundle = await duckdb.selectBundle(JSDELIVR_BUNDLES); const worker_url = URL.createObjectURL( new Blob([`importScripts("${bundle.mainWorker}");`], {type: 'text/javascript'}) ); // Instantiate the asynchronous version of...DuckDB-Wasm const worker = new Worker(worker_url); const logger = new duckdb.ConsoleLogger(); const db = new duckdb.AsyncDuckDB(logger, worker); await db...matically; the default is manual registration (see Persistence with OPFS ). The query object tunes the Arrow-to-JavaScript type mapping: castBigIntToDouble : return 64-bit integers as JavaScript numbers instead of BigInt values. This is convenient, b... - https://man.mtool.work/duckdb/2.0/clients/wasm/instantiation.html
- DuckDB_% Metadata Functions 13588
- DuckDB offers a collection of table functions that provide metadata about the current database. These functions reside in the main schema and their names are prefixed with duckdb_ . The resultset returned by a duckdb_ table function may be
...The duckdb_views view returns views that are not marked as internal: SELECT * FROM duckdb_views; duckdb_available_metrics New The duckdb_available_metrics() function was introduced in DuckDB 2.0. The duckdb_available_metrics() function lists the me...trics that can be collected by the profiler , e.g., using the tracked_metrics setting. Column Description Type metric_name The name of the metric, e.g., query.cpu_time . VARCHAR metric_type The type of the metric's value, e.g., doubl...mns The duckdb_columns() function provides metadata about the columns available in the DuckDB instance. Column Description Type database_name The name of the database that contains the column object. VARCHAR database_oid Internal identifier of the da... - https://man.mtool.work/duckdb/2.0/sql/meta/duckdb_table_functions.html
- SQLite Extension 13014
- 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
...LOAD sqlite; Usage To make a SQLite file accessible to DuckDB, use the ATTACH statement with the sqlite or sqlite_scanner type. Attached SQLite databases support both read and write operations. For example, to attach to the sakila.db file , run: ATT...ACH 'sakila.db' (TYPE sqlite); USE sakila; The tables in the file can be read as if they were normal DuckDB tables, but the underlying data is r...e PENELOPE NICK ED Writing Data to SQLite In addition to reading data from SQLite, the extension also allows you to create new SQLite database files, create tables, ingest data into SQLite and make other modifications to SQLite database files using... - https://man.mtool.work/duckdb/2.0/core_extensions/sqlite.html
- CSV Auto Detection 12836
- 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
...ughly as follows: Detect the dialect of the CSV file (delimiter, quoting rule, escape). Detect the types of each of the columns. Detect whether or not the file has a header row. By default the system will try to auto-detect al...override it by calling the read_csv with an explicit delimiter (e.g., read_csv('file.csv', delim = '|') ). Sample Size The type detection works by operating on a sample of the file. The size of the sample can be modified by setting the sample_size pa...me Description read_csv parameter Example Delimiter Delimiter delim , Quote Quote character quote " Escape Escape escape \ NewLineDelimiter New-line delimiter new_line \r\n Comment Comment character comment # SkipRows Number of rows skipped skip 1 H... - https://man.mtool.work/duckdb/2.0/data/csv/auto_detection.html
- Python Client API 12466
- Connection class duckdb. Appender Bases: object append_row ( self , * args ) → None Buffer one row, one value per column, each converted as an executemany parameter would be append_rows ( self , rows : object ) → None Buffer each row of an
...Create an appender that buffers rows and inserts, upserts, updates or deletes them in the named table at each flush array_type ( self , type : _duckdb._sqltypes.DuckDBPyType , size : int ) → _duckdb._sqltypes.DuckDBPyType Create an array type object...of ‘type' begin ( self ) → _duckdb.DuckDBPyConnection Start a new transaction checkpoint ( self ) → _duckdb.DuckDBPyConnection Sync...n a given expression. Detailed examples can be found at Relational API page . create ( table_name : str ) → None Creates a new table named table_name with the contents of the relation object. The name is table, schema.table or catalog.schema.table,... - https://man.mtool.work/duckdb/2.0/clients/python/reference/
DuckDB 2.0 Documentation / man.mtool.work