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- Loading JSON 12469
- The DuckDB JSON reader can automatically infer which configuration flags to use by analyzing the JSON file. This will work correctly in most situations, and should be the first option attempted. In rare situations where the JSON reader cann
...ist of files or a glob pattern. read_ndjson_objects(filename) Alias for read_json_objects with the parameter format set to newline_delimited . read_json_objects_auto(filename) Alias for read_json_objects with the parameter format set to auto . Parameter...rtual column and this option is only kept for compatibility reasons. BOOL false format Can be one of auto , unstructured , newline_delimited and array . VARCHAR auto hive_partitioning Whether or not to interpret the path as a Hive partitioned path . BOO...L (auto-detected) ignore_errors Whether to ignore parse errors (only possible when format is newline_delimited ). BOOL false maximum_sample_files The maximum number of JSON files sampled for auto-detection. BIGINT 32 maximu... - https://man.mtool.work/duckdb/2.0/data/json/loading_json.html
- JSON Format Settings 11877
- The JSON extension can attempt to determine the format of a JSON file when setting format to auto . Here are some example JSON files and the corresponding format settings that should be used. In each of the below cases, the format setting w
...is included for illustrative purposes. A query of this shape would work in each case: SELECT * FROM filename.json; Format: newline_delimited With format = 'newline_delimited' newline-delimited JSON can be parsed. Each line is a JSON. We use the example...{"key1":"value2", "key2": "value2"} {"key1":"value3", "key2": "value3"} SELECT * FROM read_json('records.json', format = 'newline_delimited'); key1 key2 value1 value1 value2 value2 value3 value3 Format: array If the JSON file contains a JSON array of o...ray'); key1 key2 value1 value1 value2 value2 value3 value3 Format: unstructured If the JSON file contains JSON that is not newline-delimited or an array, unstructured may be used. To demonstrate its use, we use the example file unstructured.json : { "ke... - https://man.mtool.work/duckdb/2.0/data/json/format_settings.html
- Editing 10832
- The linenoise-based CLI editor is available for macOS, Linux and Windows. DuckDB's CLI uses a line-editing library based on linenoise , which has shortcuts that are based on Emacs mode of readline . Below is a list of available commands. Yo
...hen autocompleting, revert autocompletion Miscellaneous Key Action Enter Execute query. If query is not complete, insert a newline at the end of the buffer Ctrl + J Execute query. If query is not complete, insert a newline at the end of the buffer Ctrl...plete, terminate it with ; and execute it Ctrl + L Clear screen Ctrl + O Cancel editing of current query Ctrl + X Insert a newline after the cursor Ctrl + Q , then click Move cursor to mouse click position Ctrl + Z Suspend CLI and return to shell, use f...Read-Line If you prefer, you can use rlwrap to use read-line directly with the shell. Then, use Shift + Enter to insert a newline and Enter to execute the query: rlwrap --substitute-prompt="D " duckdb -batch... - https://man.mtool.work/duckdb/2.0/clients/cli/editing.html
- Literal Types 10484
- DuckDB has special literal types for representing NULL , integer and string literals in queries. These have their own binding and conversion rules. Prior to DuckDB version 0.10.0, integer and string literals behaved identically to the INTEG
...ng Literal Concatenation Consecutive single-quoted string literals separated only by whitespace that contains at least one newline are implicitly concatenated: SELECT 'Hello' ' ' 'World' AS greeting; is equivalent to: SELECT 'Hello' || ' ' || 'World' AS...oth return the following result: greeting Hello World Note that implicit concatenation only works if there is at least one newline between the literals. Using adjacent string literals separated by whitespace without a newline results in a syntax error:...ing literal, use '' . For example, SELECT '''' AS s returns ' . To enable some common escape sequences, such as \n for the newline character, prefix a string literal with e (or E ). SELECT e'Hello\nworld' AS msg; ┌──────────────┐ │ msg │ │ varchar │ ├──... - https://man.mtool.work/duckdb/2.0/sql/data_types/literal_types.html
- Reading Faulty CSV Files 8377
- CSV files can come in all shapes and forms, with some presenting many errors that make the process of cleanly reading them inherently difficult. To help users read these files, DuckDB supports detailed error messages, the ability to skip fa
...R delimiter The delimiter used e.g., ; VARCHAR quote The quote used e.g., " VARCHAR escape The escape used e.g., " VARCHAR newline_delimiter The newline delimiter used e.g., \r\n VARCHAR skip_rows If any rows were skipped from the top of the file UINTEG...ation about the rejected tuples. For example: FROM reject_scans; Outputs: scan_id file_id file_path delimiter quote escape newline_delimiter skip_rows has_header columns date_format timestamp_format user_arguments 5 0 faulty.csv , " " \n 0 false {'name'... - https://man.mtool.work/duckdb/2.0/data/csv/reading_faulty_csv_files.html
- JSON Export 8377
- To export the data from a table to a JSON file, use the COPY statement: COPY tbl TO 'output.json'; The result of queries can also be directly exported to a JSON file: COPY (SELECT * FROM range(3) tbl(n)) TO 'output.json'; {"n":0} {"n":1} {"
...n":2} The JSON export writes JSON lines by default, standardized as Newline-delimited JSON . The ARRAY option can be used to write a single JSON array object instead. COPY (SELECT * FROM range(3) tb... - https://man.mtool.work/duckdb/2.0/guides/file_formats/json_export.html
- Regular Expressions 8377
- DuckDB offers pattern matching operators ( LIKE , SIMILAR TO , GLOB ), as well as support for regular expressions via functions. Regular Expression Syntax DuckDB uses the RE2 library as its regular expression engine. For the regular express
...e-sensitive matching 'i' Case-insensitive matching 'l' Match literals instead of regular expression tokens 'm' , 'n' , 'p' Newline sensitive matching 'g' Global replace, only available for regexp_replace 's' Non-newline sensitive matching For example: S...-sensitive matching) should be passed if applicable. Note that by default the RE2 library doesn't match the . character to newline. Original Optimized equivalent regexp_matches('hello world', '^hello', 'c') prefix('hello world', 'hello') regexp_matches(... - https://man.mtool.work/duckdb/2.0/sql/functions/regular_expressions.html
- Writing JSON 8133
- The contents of tables or the result of queries can be written directly to a JSON file using the COPY statement. For example: CREATE TABLE cities AS FROM (VALUES ('Amsterdam', 1), ('London', 2)) cities(name, id); COPY cities TO 'cities.json
...COPY ... (FORMAT GEOJSON) writes a GeoJSON FeatureCollection . FORMAT GEOJSONL (or ARRAY true with FORMAT GEOJSON ) writes newline-delimited Feature objects. You do not need json_geometry_format for these copy formats. COPY (SELECT 'POINT(0 1)'::GEOMETR... - https://man.mtool.work/duckdb/2.0/data/json/writing_json.html
- COPY Statement 7784
- Examples Read a CSV file into the lineitem table, using auto-detected CSV options: COPY lineitem FROM 'lineitem.csv'; Read a CSV file into the lineitem table, using manually specified CSV options: COPY lineitem FROM 'lineitem.csv' (DELIMITE
...e lineitem.parquet into the lineitem table: COPY lineitem FROM 'lineitem.parquet' (FORMAT parquet); Read the contents of a newline-delimited JSON file lineitem.ndjson into the lineitem table: COPY lineitem FROM 'lineitem.ndjson' (FORMAT json); Read the...query.parquet : COPY (SELECT 42 AS a, 'hello' AS b) TO 'query.parquet' (FORMAT parquet); Copy the result of a query to the newline-delimited JSON file query.ndjson : COPY (SELECT 42 AS a, 'hello' AS b) TO 'query.ndjson' (FORMAT json); Copy the result of...ame Description Type Default ARRAY Whether to write a JSON array. If true , a JSON array of records is written, if false , newline-delimited JSON is written BOOL false COMPRESSION The compression type for the file. By default this will be detected autom... - https://man.mtool.work/duckdb/2.0/sql/statements/copy.html
- Dot Commands 7558
- Dot commands are available in the DuckDB CLI client. To use one of these commands, begin the line with a period ( . ) immediately followed by the name of the command you wish to execute. Additional arguments to the command are entered, spac
...timer on or off , with DIGITS decimals for the real time (default: 3). SQL statements separated by ; but not separated via newline are measured together .ui_command ⟨COMMAND⟩ Set the command executed by the -ui argument . CALL is prepended to COMMAND ....nt filters the output using a LIKE pattern . Multiple patterns can be provided as additional arguments. .dump %swim% The --newlines option allows unescaped newline characters in the output: .dump --newlines Command History New As of DuckDB 2.0, the .his... - https://man.mtool.work/duckdb/2.0/clients/cli/dot_commands.html
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