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- Directly Reading Files – DuckDB 16047
- This page is for DuckDB 1.3, which is outdated.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
...ead_text and read_blob functions. These functions accept a filename, a list of filenames or a glob pattern, and output the content of each file as a VARCHAR or BLOB , respectively, as well as additional metadata such as the file size and last modified t...t The read_text table function reads from the selected source(s) to a VARCHAR . Each file results in a single row with the content field holding the entire content of the respective file. SELECT size , parse_path ( filename ), content FROM read_text ( '...test/sql/table_function/files/*.txt' ); size parse_path(filename) content 12 [test, sql, table_function, files, one.txt] Hello World! 2 [test, sql, table_function, files, three.txt] 42 10 [test, s... - https://man.mtool.work/duckdb/1.3/guides/file_formats/read_file.html
- Full-Text Search Extension – DuckDB 11024
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...used. Example Usage Create a table and fill it with text data: CREATE TABLE documents ( document_identifier VARCHAR , text_content VARCHAR , author VARCHAR , doc_version INTEGER ); INSERT INTO documents VALUES ( 'doc1' , 'The mallard is a dabbling duck...cat is a domestic species of small carnivorous mammal.' , 'Laurens Kuiper' , 2 ); Build the index, and make both the text_content and author columns searchable. PRAGMA create_fts_index ( 'documents' , 'document_identifier' , 'text_content' , 'author' )...author field index for documents that are authored by Muhleisen . This retrieves doc1 : SELECT document_identifier , text_content , score FROM ( SELECT * , fts_main_documents. match_bm25 ( document_identifier , 'Muhleisen' , fields : = 'author' ) AS sc... - https://man.mtool.work/duckdb/1.3/core_extensions/full_text_search.html
- Caveats – DuckDB 10521
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...can differ based on the context. In some cases, it is based on raw text comparison, while in other cases, it uses logical content comparison. The following query returns true for all fields: SELECT a != b , -- Space is part of physical JSON content. De...spite equal logical content, values are treated as not equal. c != d , -- Same. c [ 0 ] = d [ 0 ], -- Equality because space was removed from physical...content of fields: a = c [ 0 ], -- Indeed, field is equal to empty list without space... b != c [ 0 ], -- ... but different from e... - https://man.mtool.work/duckdb/1.3/data/json/caveats.html
- Utility Functions – DuckDB 7847
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...es . If the optional by_name parameter is set to true , it uses UNION ALL BY NAME semantics. read_blob(source) Returns the content from source (a filename, a list of filenames, or a glob pattern) as a BLOB . See the read_blob guide for more details. rea...d_text(source) Returns the content from source (a filename, a list of filenames, or a glob pattern) as a VARCHAR . The file content is first validated to be...emantics. Example query_table(['t1', 't2']) Result (the union of the two tables) read_blob(source) Description Returns the content from source (a filename, a list of filenames, or a glob pattern) as a BLOB . See the read_blob guide for more details. Exa... - https://man.mtool.work/duckdb/1.3/sql/functions/utility.html
- Iceberg Extension – DuckDB 7511
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...ed via the REST Catalog: SELECT * FROM iceberg_metadata ( iceberg_table ); manifest_path manifest_sequence_number manifest_content status content file_path file_format record_count lineitem_iceberg/metadata/10eaca8a-1e1c-421e-ad6d-b232e5ee23d3-m1.avro 2..., version = 'version-hint.txt' , allow_moved_paths = true ); The iceberg extension will open this file and use the entire content of the file as a provided version number. Note that the entire content of the version-hint.txt file will be treated as a l...Amazon S3 Tables COPY Statement Iceberg REST Catalogs Summarize See this page as Markdown Edit this page on GitHub Report content issue See this repository on GitHub © 2026 DuckDB Foundation, Amsterdam NL DuckDB Home Code of Conduct Trademark Use Blog... - https://man.mtool.work/duckdb/1.3/core_extensions/iceberg/overview.html
- Writing JSON – DuckDB 7008
- 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
...nd Format Execution Format Pivot Sitemap Live Demo Documentation / Data Import / JSON Files Copy Markdown Writing JSON The contents of tables or the result of queries can be written directly to a JSON file using the COPY statement. For example: CREATE T...( 'London' , 2 )) cities ( name , id ); COPY cities TO 'cities.json' ; This will result in cities.json with the following content: { "name" : "Amsterdam" , "id" : 1 } { "name" : "London" , "id" : 2 } See the COPY statement for more information. 関連キー...ワード cities statement Amsterdam London json Documentation Import Files Copy Markdown Writing contents tables queries written directly using example following content more information 関連するページ VALUES Clause PIVOT State... - https://man.mtool.work/duckdb/1.3/data/json/writing_json.html
- SELECT Statement – DuckDB 7008
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...ach table, the rowid pseudocolumn returns the row identifiers based on the physical storage. CREATE TABLE t ( id INTEGER , content VARCHAR ); INSERT INTO t VALUES ( 42 , 'hello' ), ( 43 , 'world' ); SELECT rowid , id , content FROM t ; rowid id content...use DELETE Statement WINDOW Clause Friendly SQL INSERT Statement See this page as Markdown Edit this page on GitHub Report content issue © 2026 DuckDB Foundation, Amsterdam NL DuckDB Home Code of Conduct Trademark Use Blog In this article Examples Synta... - https://man.mtool.work/duckdb/1.3/sql/statements/select.html
- Blob Functions – DuckDB 6002
- 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
...Returns the MD5 hash of the blob as a HUGEINT . octet_length(blob) Number of bytes in blob . read_blob(source) Returns the content from source (a filename, a list of filenames, or a glob pattern) as a BLOB . See the read_blob guide for more details. rep...iption Number of bytes in blob . Example octet_length('\xAA\xBB'::BLOB) Result 2 read_blob(source) Description Returns the content from source (a filename, a list of filenames, or a glob pattern) as a BLOB . See the read_blob guide for more details. Exa...lity Functions List Functions Timestamp with Time Zone Functions See this page as Markdown Edit this page on GitHub Report content issue © 2026 DuckDB Foundation, Amsterdam NL DuckDB Home Code of Conduct Trademark Use Blog... - https://man.mtool.work/duckdb/1.3/sql/functions/blob.html
- My Workload Is Slow – DuckDB 5666
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...oo many threads? Try limiting the amount of threads . Are you aware of other common issues? If so, please click the Report content issue link below and describe them along with their workarounds. 関連キーワード using DuckDB memory workload attached clou...uning Workloads Connect Catch C/C++ Tests R Out of Memory Errors See this page as Markdown Edit this page on GitHub Report content issue © 2026 DuckDB Foundation, Amsterdam NL DuckDB Home Code of Conduct Trademark Use Blog... - https://man.mtool.work/duckdb/1.3/guides/performance/my_workload_is_slow.html
- Reclaiming Space – DuckDB 5666
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...e following example, we first connect to the original database db1 , then the new (empty) database db2 . Then, we copy the content of db1 to db2 . ATTACH 'db1.db' AS db1 ; ATTACH 'db2.db' AS db2 ; COPY FROM DATABASE db1 TO db2 ; 関連キーワード database...VACUUM Statement Copying an In Connect DELETE Statement Caveats See this page as Markdown Edit this page on GitHub Report content issue © 2026 DuckDB Foundation, Amsterdam NL DuckDB Home Code of Conduct Trademark Use Blog In this article CHECKPOINT VAC... - https://man.mtool.work/duckdb/1.3/operations_manual/footprint_of_duckdb/reclaimi...
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