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- JSON Processing Functions 10664
- JSON Extraction Functions There are two extraction functions, which have their respective operators. The operators can only be used if the string is stored as the JSON logical type. These functions support the same two location notations as
...JSON Scalar functions . Function Alias Operator Description json_exists(json, path) Returns true if the supplied path exists in the json , and false otherwise. json_extract(json, path) json_extract_path ->...Extracts JSON from json at the given path . If path is a LIST , the result will be a LIST of JSON . json_extract_string(json, path) json_extract_path_text ->> Extra...cts VARCHAR from json at the given path . If path is a LIST , the result will be a LIST of VARCHAR . json_value(json, path) Extracts JSON from json at the given p... - https://man.mtool.work/duckdb/2.0/data/json/json_functions.html
- WITH Clause 10541
- The WITH clause allows you to specify common table expressions (CTEs). Regular (non-recursive) common-table-expressions are essentially views that are limited in scope to a particular query. CTEs can reference each other and can be nested.
...', 6), (5, 'Rock', 7), (6, 'Rap', 7), (7, 'Music', 9), (8, 'Movies', 9), (9, 'Art', NULL); The following query returns the path from the node Oasis to the root of the tree ( Art ). WITH RECURSIVE tag_hierarchy(id, source, path) AS ( SELECT id, name,...[name] AS path FROM tag WHERE subclassof IS NULL UNION ALL SELECT tag.id, tag.name, list_prepend(tag.name, tag_hierarchy.path) FROM tag,...tag_hierarchy WHERE tag.subclassof = tag_hierarchy.id ) SELECT path FROM tag_hierarchy WHERE source = 'Oasis'; path [Oasis, Rock, Music, Art] Graph Traversal The WITH RECURSIVE clause can be... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/with.html
- ATTACH and DETACH Statements 9779
- 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
...'quack_quack', ENCRYPTION_CIPHER 'CTR'); Database encryption implies using storage version 1.4.0 or later. Expressions in Paths and Options New Using expressions for the database path was introduced in DuckDB 2.0. In earlier versions, the path had t...o be a string literal. The database path and the option values can be arbitrary scalar expressions rather than string literals. DuckDB evaluates these expressions...eeps credentials and environment-specific identifiers, such as account numbers, out of your SQL scripts. Read the database path from a variable: SET VARIABLE db_path = 'file.db'; ATTACH getvariable('db_path') AS file_db; Build the path by concatenati... - https://man.mtool.work/duckdb/2.0/sql/statements/attach.html
- File Access with the file: Protocol 9693
- DuckDB supports using the file: protocol. It currently supports the following formats: file:/some/path (host omitted completely) file:///some/path (empty host) file://localhost/some/path ( localhost as host) Note that the following formats
...are not supported because they are non-standard: file:some/relative/path (relative path) file://some/path (double-slash path) Additionally, the file: protocol currently does not support remote (n... - https://man.mtool.work/duckdb/2.0/guides/file_formats/file_access.html
- Delta Extension 9374
- The delta extension adds support for the Delta Lake open-source storage format . It is built using the Delta Kernel . The extension reads Delta tables, local and remote, and writes them: it can create tables and append to them. For implemen
...load it manually, run: INSTALL AND LOAD delta; Usage To scan a local Delta table, run: SELECT * FROM delta_scan('file:///⟨path⟩'); Attaching Tables A Delta table can also be attached as a database. The database holds exactly one table, with the same...name as the database, so my_table and my_table.my_table refer to the same table: ATTACH 'file:///⟨path⟩' AS my_table (TYPE delta); SELECT * FROM my_table; Reading from an S3 Bucket To scan a Delta table in an S3 bucket , run:...SELECT * FROM delta_scan('s3://⟨my_bucket⟩/⟨path⟩'); To authenticate, create a secret : CREATE SECRET ( TYPE s3, PROVIDER credential_chain ); SELECT * FROM delta_scan('s3:... - https://man.mtool.work/duckdb/2.0/core_extensions/delta.html
- ADBC Client 9091
- Installation To use the DuckDB ADBC client, download the libduckdb archive for your platform and follow the instructions below . For Python, install the duckdb package instead, as described in the Python section . The latest stable version
...ion. (AdbcDatabase *database, const char *key, const char *value, AdbcError *error) AdbcDatabaseSetOption(&adbc_database, "path", "test.db", &adbc_error) DatabaseInit Finish setting options and initialize the database. (AdbcDatabase *database, AdbcEr...e *database, AdbcError *error) AdbcDatabaseRelease(&adbc_database, &adbc_error) Database Options Option Description driver Path to the DuckDB shared library ( libduckdb.so , libduckdb.dylib , or duckdb.dll ). entrypoint Entry point function name. Mus...t be duckdb_adbc_init . path Path to a DuckDB database file. If not set, an in-memory database is created. uri Alternative to path . Accepts plain path... - https://man.mtool.work/duckdb/2.0/clients/adbc.html
- Azure Extension 9018
- The azure extension lets DuckDB read and write files in Azure Blob Storage and Azure Data Lake Storage (ADLS) Gen2. Installing and Loading The azure extension will be transparently autoloaded on first use from the official extension reposit
...y Azure storage as follows: Azure Blob Storage Allowed URI schemes: az or azure SELECT count(*) FROM 'az://⟨my_container⟩/⟨path⟩/⟨my_file⟩.⟨parquet_or_csv⟩'; Globs are also supported: SELECT * FROM 'az://⟨my_container⟩/⟨path⟩/*.csv'; SELECT * FROM 'a...z://⟨my_container⟩/⟨path⟩/**'; Or with a fully qualified path syntax: SELECT count(*) FROM 'az://⟨my_storage_account⟩.blob.core.windows.net/⟨my_con...tainer⟩/⟨path⟩/⟨my_file⟩.⟨parquet_or_csv⟩'; SELECT * FROM 'az://⟨my_storage_account⟩.blob.core.windows.net/⟨my_container⟩/⟨path⟩/*.csv';... - https://man.mtool.work/duckdb/2.0/core_extensions/azure.html
- Logging 8858
- DuckDB implements a logging mechanism that provides users with detailed information about events such as query execution, performance metrics and system events. Warning Logs may contain sensitive information, including secrets and credentia
...ch you can inspect at any time with DESCRIBE FROM duckdb_logs_parsed(⟨log_type⟩) : Log Type Schema FileSystem fs VARCHAR , path VARCHAR , op VARCHAR , bytes BIGINT , pos BIGINT HTTP request STRUCT(type, url, start_time, duration_ms, headers MAP) , re...o stdout CALL enable_logging(storage = 'stdout'); Logging to File CALL enable_logging(storage = 'file', storage_config = {'path': 'path/to/store/logs'}); or using the equivalent shorthand: CALL enable_logging(storage_path = 'path/to/store/logs'); Adv...memory yes file configurable stdout no For file storage, you can switch between normalized and denormalized by providing a path to a directory (for normalized) or a path ending in .csv (for denormalized). For file logging, denormalized is generally r... - https://man.mtool.work/duckdb/2.0/operations_manual/logging/overview.html
- Advanced Installation Methods 8809
- Downloading Extensions Directly from S3 Downloading an extension directly can be helpful when building a Lambda service or container that uses DuckDB. DuckDB extensions are stored in public S3 buckets, but the directory structure of those b
...ample: http://extensions.duckdb.org/v2.0.0/windows_amd64/json.duckdb_extension.gz Installing an Extension from an Explicit Path The INSTALL command can be used with the path to a .duckdb_extension file: INSTALL 'path/to/httpfs.duckdb_extension'; Note...that compressed .duckdb_extension.gz files need to be decompressed beforehand. It is also possible to specify remote paths. Loading an Extension from an Explicit Path LOAD can be used with the path to a .duckdb_extension . For example, if the f...ile was available at the (relative) path path/to/httpfs.duckdb_extension , you can load it as follows: LOAD 'path/to/httpfs.duckdb_extension'; This will skip any c... - https://man.mtool.work/duckdb/2.0/extensions/advanced_installation_methods.html
- Lance Extension 8772
- The lance extension adds support for reading and writing Lance tables. Lance is a modern lakehouse format optimized for ML/AI workloads, with native cloud storage support. Installing and Loading You can install the lance extension from Duck
...INSTALL AND LOAD lance; Usage Full SQL reference Cloud storage reference Query a Lance Dataset Local file: SELECT * FROM '⟨path/to/dataset.lance⟩' LIMIT 10; S3: SELECT * FROM 's3://⟨bucket/path/to/out.lance⟩' LIMIT 10; To access object store URIs (e....crets Manager : CREATE SECRET ( TYPE lance, PROVIDER credential_chain, SCOPE 's3://bucket/' ); SELECT * FROM 's3://⟨bucket/path/to/out.lance⟩' LIMIT 10; Write a Lance Dataset Use the COPY ... TO ... statement to materialize query results as a Lance d...t from a query COPY ( SELECT 1::BIGINT AS id, 'a'::VARCHAR AS s UNION ALL SELECT 2::BIGINT AS id, 'b'::VARCHAR AS s ) TO '⟨path/to/dataset.lance⟩' ( FORMAT lance, MODE 'overwrite' ); -- Read it back via the replacement scan SELECT count(*) FROM '⟨pat... - https://man.mtool.work/duckdb/2.0/core_extensions/lance.html
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