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- Reclaiming Space 12055
- DuckDB uses a single-file format, which has some inherent limitations w.r.t. reclaiming disk space. CHECKPOINT To reclaim space after deleting rows, use the CHECKPOINT statement . VACUUM The VACUUM statement does not trigger vacuuming delet
... - https://man.mtool.work/duckdb/2.0/operations_manual/footprint_of_duckdb/reclaimi...
- DELETE Statement 11224
- The DELETE statement removes rows from the table identified by the table-name. If the WHERE clause is not present, all records in the table are deleted. If a WHERE clause is supplied, then only those rows for which the WHERE clause results
...ase: DELETE FROM tbl WHERE i = 2; Delete all rows in the table tbl : DELETE FROM tbl; USING Clause The USING clause allows deleting based on the content of other tables or subqueries. RETURNING Clause The RETURNING clause allows returning the deleted val... - https://man.mtool.work/duckdb/2.0/sql/statements/delete.html
- Transaction Management 10410
- DuckDB supports ACID database transactions . Transactions provide isolation, i.e., changes made by a transaction are not visible from concurrent transactions until it is committed. A transaction can also be aborted, which discards any chang
...ALUES ('Bruce', 39); ROLLBACK; SELECT * FROM person; The first transaction (inserting “Ada”) was committed but the second (deleting “Ada” and inserting “Bruce”) was aborted. Therefore, the resulting table will only contain <'Ada', 52> .... - https://man.mtool.work/duckdb/2.0/sql/statements/transactions.html
- Secrets Manager 8766
- The Secrets manager provides a unified user interface for secrets across all backends that use them. Secrets can be scoped, so different storage prefixes can have different secrets, allowing for example to join data across organizations in
...ed secrets are always temporary. This lets different connections hold secrets of the same type and scope without clashing. Deleting Secrets Secrets can be deleted using the DROP SECRET statement , e.g.: DROP PERSISTENT SECRET my_persistent_secret; Creati... - https://man.mtool.work/duckdb/2.0/configuration/secrets_manager.html
- Vector Similarity Search Extension 7537
- The vss extension is an experimental extension for DuckDB that adds indexing support to accelerate vector similarity search queries using DuckDB's new fixed-size ARRAY type. See the announcement blog post and the “What's New in the Vector S
...and re-creating the index. Inserts, Updates, Deletes and Re-Compaction The HNSW index does support inserting, updating and deleting rows from the table after index creation. However, there are two things to keep in mind: It's faster to create the index a... - https://man.mtool.work/duckdb/2.0/core_extensions/vss.html
- Reading and Writing Parquet Files 7537
- Examples Read a single Parquet file: SELECT * FROM 'test.parquet'; Figure out which columns/types are in a Parquet file: DESCRIBE SELECT * FROM 'test.parquet'; Create a table from a Parquet file: CREATE TABLE test AS SELECT * FROM 'test.par
...ter The schema parameter allows you to read the Parquet file using a specific schema. This is useful for renaming, adding, deleting, reordering, or casting columns when reading Parquet files. The MAP can be keyed by field-id or by column name. To map by... - https://man.mtool.work/duckdb/2.0/data/parquet/overview.html
- ODBC 101: A Duck Themed Guide to ODBC 7537
- What is ODBC? ODBC which stands for Open Database Connectivity, is a standard that allows different programs to talk to different databases including, of course, DuckDB. This makes it easier to build programs that work with many different d
...< std::endl; You can also execute additional queries and perform other database operations such as inserting, updating, or deleting data. 6. Free the Handles and Disconnecting Finally, we need to free the handles and disconnect from the database. First,... - https://man.mtool.work/duckdb/2.0/guides/odbc/general.html
- JSON Processing Functions 7139
- 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
...left to right. Works like json_merge_patch , except that a JSON null value in a patch keeps the original value instead of deleting the key. A SQL NULL patch returns NULL , while a SQL NULL json is ignored. json_merge_patch_diff(json_orig, json_modified)... - https://man.mtool.work/duckdb/2.0/data/json/json_functions.html
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