Results of 1 - 10 of about 12 for indexed (0.005 sec.)
- Bitstring Functions – DuckDB 13920
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...urns first starting index of the specified substring within bits, or zero if it's not present. The first (leftmost) bit is indexed 1. bitstring(bitstring, length) Returns a bitstring of determined length. get_bit(bitstring, index) Extracts the nth bit f...rom bitstring; the first (leftmost) bit is indexed 0. length(bitstring) Alias for bit_length . octet_length(bitstring) Returns the number of bytes in the bitstring. set_bit(...bitstring, index, new_value) Sets the nth bit in bitstring to newvalue; the first (leftmost) bit is indexed 0. Returns a new bitstring. bit_count(bitstring) Description Returns the number of set bits in the bitstring. Example bit_... - https://man.mtool.work/duckdb/1.3/sql/functions/bitstring.html
- Indexing – DuckDB 10736
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...a column are as follows: ART indexes enable constraint checking during changes (inserts, updates, and deletes). Changes on indexed tables perform worse than their non-indexed counterparts. That is because of index maintenance for these operations. For s...ome use cases, single-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...umns these Indexes performance queries ordered selective filters order using allows table zonemaps also groups constraints indexed single 関連するページ Indexes Tuning Workloads CREATE INDEX Statement Vector Similarity Search Extension Configuration Fri... - https://man.mtool.work/duckdb/1.3/guides/performance/indexing.html
- CREATE INDEX Statement – DuckDB 9056
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...t in duplicate entries will generate an error. name The name of the index to be created. table The name of the table to be indexed. column The name of the column to be indexed. expression An expression based on one or more columns of the table. The expr... - https://man.mtool.work/duckdb/1.3/sql/statements/create_index.html
- R-Tree Indexes – DuckDB 8861
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...f a point is the point itself. By traversing the R-tree from top to bottom, it is possible to very quickly search a R-tree-indexed table for only those rows where the indexed geometry column intersect a specific region of interest, as you can skip searc...n index on the table. CREATE INDEX my_idx ON t1 USING RTREE ( geom ); -- Perform a query with a "spatial predicate" on the indexed geometry column -- Note how the second argument in this case, the ST_MakeEnvelope call is a "constant" SELECT count ( * )... - https://man.mtool.work/duckdb/1.3/core_extensions/spatial/r-tree_indexes.html
- Aggregate Functions – DuckDB 8684
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...ile_cont(x, pos) The interpolated pos -quantile of x for 0 <= pos <= 1 . Returns the pos * (n_nonnull_values - 1) th (zero-indexed, in the specified order) value of x or an interpolation between the adjacent values if the index is not an integer. Intuit...os) The discrete pos -quantile of x for 0 <= pos <= 1 . Returns the greatest(ceil(pos * n_nonnull_values) - 1, 0) th (zero-indexed, in the specified order) value of x . Intuitively, assigns to each value of x an equisized sub-interval (left-open and rig...pos) Description The interpolated pos -quantile of x for 0 <= pos <= 1 . Returns the pos * (n_nonnull_values - 1) th (zero-indexed, in the specified order) value of x or an interpolation between the adjacent values if the index is not an integer. Intuit... - https://man.mtool.work/duckdb/1.3/sql/functions/aggregates.html
- Full-Text Search Extension – DuckDB 8490
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...umn name of document identifier, e.g., 'document_identifier' input_values... VARCHAR Column names of the text fields to be indexed (vararg), e.g., 'text_field_1' , 'text_field_2' , …, 'text_field_N' , or '\*' for all columns in input_table of type VARCH...VARCHAR Comma-separarated list of fields to search in, e.g., 'text_field_2, text_field_N' . Defaults to NULL to search all indexed fields k DOUBLE Parameter k 1 in the Okapi BM25 retrieval model. Defaults to 1.2 b DOUBLE Parameter b in the Okapi BM25 re... - https://man.mtool.work/duckdb/1.3/core_extensions/full_text_search.html
- Vector Similarity Search Extension – DuckDB 8118
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...ed to accelerate queries that use an ORDER BY clause evaluating one of the supported distance metric functions against the indexed columns and a constant vector, followed by a LIMIT clause. For example: SELECT * FROM my_vector_table ORDER BY array_dista...s, meaning that if a crash occurs or the database is shut down unexpectedly while there are uncommitted changes to a HNSW -indexed table, you can end up with data loss or corruption of the index . If you enable this option and experience an unexpected s... - https://man.mtool.work/duckdb/1.3/core_extensions/vss.html
- JSON Overview – DuckDB 7747
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...DB only supports lookups in JSONPath, i.e., extracting fields with .<key> or array elements with [<index>] . Arrays can be indexed from the back and both approaches support the wildcard * . DuckDB not support the full JSONPath syntax because SQL is read... - https://man.mtool.work/duckdb/1.3/data/json/overview.html
- Functions – DuckDB 7747
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...rns first starting index of the specified substring within bits, or zero if it is not present. The first (leftmost) bit is indexed 1 bitstring scalar BIT [bitstring, length] [VARCHAR, INTEGER] Pads the bitstring until the specified length Currently, the... - https://man.mtool.work/duckdb/1.3/sql/functions/overview.html
- TPC-H Extension – DuckDB 7552
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...ber of partitions overwrite BOOLEAN (Not used) sf DOUBLE Scale factor step UINTEGER Defines the partition to be generated, indexed from 0 to children - 1. Must be defined when the children arguments is defined suffix VARCHAR Append the suffix to table n... - https://man.mtool.work/duckdb/1.3/core_extensions/tpch.html
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