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- SET VARIABLE and RESET VARIABLE Statements 11858
- DuckDB supports the definition of SQL-level variables using the SET VARIABLE and RESET VARIABLE statements. Variable Scopes DuckDB supports two levels of variable scopes: Scope Description SESSION Variables with a SESSION scope are local to
...you and only affect the current session. GLOBAL Variables with a GLOBAL scope are specific configuration option variables that affect the enti... - https://man.mtool.work/duckdb/2.0/sql/statements/set_variable.html
- MERGE INTO Statement 10791
- The MERGE INTO statement is an alternative to INSERT INTO ... ON CONFLICT that doesn't need a primary key since it allows for a custom match condition. This is a very useful alternative for upserting use cases ( INSERT + UPDATE ) when the d
..., DuckDB also supports multiple UPDATE and DELETE conditions. The RETURNING clause can be used to indicate which rows were affected by the MERGE statement. -- Let's get John back in! INSERT INTO people VALUES (1, 'John', 105_000.0); MERGE INTO people U...by default when specifying conditions, we look at the target. Multiple Matching Source Rows A MERGE INTO statement may not affect the same target row more than once. If a target row matches multiple source rows and a WHEN MATCHED clause applies (e.g.,...source ON target.id = source.id WHEN MATCHED THEN UPDATE SET v = source.v; Invalid Input Error: MERGE INTO command cannot affect the same target row more than once. A target row matched more than one source row; ensure the source rows are deduplicated... - https://man.mtool.work/duckdb/2.0/sql/statements/merge_into.html
- Indexing 8346
- DuckDB has two types of indexes: zonemaps and ART indexes. Zonemaps DuckDB automatically creates zonemaps (also known as min-max indexes) for the columns of all general-purpose data types . Operations like predicate pushdown into scan opera
...gle-column ART indexes improve the performance of highly selective queries using the indexed column. An ART index does not affect the performance of join, aggregation, and sorting queries. ART Index Scans ART index scans probe a single-column ART index...ffers if it has to evict memory. Thus, indexes can take up a significant portion of DuckDB's available memory, potentially affecting the performance of memory-intensive queries. Re-attaching ( DETACH + ATTACH ) the database containing indexes can mitig... - https://man.mtool.work/duckdb/2.0/guides/performance/indexing.html
- R Client 7997
- Installation To use the DuckDB R client, visit the R installation page . The latest stable version of the DuckDB R client is 2.0.0. Installation duckdb : R Client The DuckDB R client can be installed using the following command: install.pac
...of DuckDB, e.g.: SET memory_limit = '2GB'; Note that this limit is only applied to the memory DuckDB uses and it does not affect the memory use of other R libraries. Therefore, the total memory used by the R process may be higher than the configured m... - https://man.mtool.work/duckdb/2.0/clients/r.html
- Connect 6931
- Overview Every DuckDB feature reachable from Java starts with a Connection . This page covers the JDBC URL forms the driver accepts, how DuckDB and driver options are passed and which of them win, how connections come to share (or not share
...bc:duckdb:/tmp/my_database;threads=4;async_threads=4 An already-running instance can be resized with SET statements, which affect every connection to that instance. Note that changing threads does not resize the asynchronous pool, so set async_threads... - https://man.mtool.work/duckdb/2.0/clients/java/connecting.html
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