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- Indexes 11886
- Index Types DuckDB has two built-in index types. Indexes can also be defined via extensions . Min-Max Index (Zonemap) A min-max index (also known as zonemap or block range index) is automatically created for columns of all general-purpose d
...Statements To create an ART index , use the CREATE INDEX statement . To drop an ART index , use the DROP INDEX statement . Limitations of ART Indexes ART indexes create a secondary copy of the data in a second location. Maintaining that second copy complic...ates processing. Thus, certain limitations currently apply when it comes to modifying data that is also stored in secondary indexes. As expected, indexes have a str...entire rows are rewritten instead of only the affected columns. Additionally, it causes the following constraint-checking limitation of UPDATE statements. The same limitation exists in other DBMSs, like PostgreSQL. In the example below, note how the numbe... - https://man.mtool.work/duckdb/2.0/sql/indexes.html
- TPC-H Extension 8371
- The tpch extension implements the data generator and queries for the TPC-H benchmark . Installing and Loading The tpch extension is shipped by default in some DuckDB builds, otherwise it will be transparently autoloaded on first use. If you
...l differences from the official TPC-H specification. To obtain fully TPC-compliant datasets, use the tpchgen-cli project . Limitation The tpch(⟨query_id⟩) function runs a fixed TPC-H query with pre-defined bind parameters (a.k.a. substitution parameters).... - https://man.mtool.work/duckdb/2.0/core_extensions/tpch.html
- SQL to/from JSON 7627
- DuckDB provides functions to serialize and deserialize SELECT statements between SQL and JSON, as well as executing JSON serialized statements. Function Type Description json_deserialize_sql(json) Scalar Deserialize one or many json seriali
...erialized_sql(varchar) pragma version to execute the statements in the same query context as the pragma, although with the limitation that the serialized JSON must be provided as a constant string, i.e., you cannot do PRAGMA json_execute_serialized_sql(jso... - https://man.mtool.work/duckdb/2.0/data/json/sql_to_and_from_json.html
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