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- Subqueries – DuckDB 13014
- This page is for DuckDB 1.3, which is outdated.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
...Format Execution Format Pivot Sitemap Live Demo Documentation / SQL / Expressions Copy Markdown Subqueries Subqueries are parenthesized query expressions that appear as part of a larger, outer query. Subqueries are usually based on SELECT ... FROM , b...have been uncorrelated subqueries, where the subqueries themselves are entirely self-contained and can be run without the parent query. There exists a second type of subqueries called correlated subqueries. For correlated subqueries, the subquery uses...values from the parent subquery. Conceptually, the subqueries are run once for every single row in the parent query. Perhaps a simple way of envi... - https://man.mtool.work/duckdb/1.3/sql/expressions/subqueries.html
- JSON Processing Functions – DuckDB 11656
- This page is for DuckDB 1.3, which is outdated.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
...tracts, has a low precedence as it is also used in lambda functions . Therefore, you need to surround the -> operator with parentheses when expressing operations such as equality comparisons ( = ). For example: SELECT (( JSON '{"field": 42}' ) -> 'fiel...element. The resulting table has the following columns: Field Type Description key VARCHAR Key of element relative to its parent value JSON Value of element type VARCHAR json_type (function) of this element atom JSON json_value (function) of this elem...ent id UBIGINT Element identifier, numbered by parse order parent UBIGINT id of parent element fullkey VARCHAR JSON path to element path VARCHAR JSON path to parent element json JSON (Virt... - https://man.mtool.work/duckdb/1.3/data/json/json_functions.html
- Vectors – DuckDB 9063
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...id of the logical type can then be obtained using duckdb_get_type_id . Vectors themselves do not have sizes. Instead, the parent data chunk has a size (that can be obtained through duckdb_data_chunk_get_size ). All vectors that belong to a data chunk...es) duckdb_list_vector_get_child Retrieves the child vector of a list vector. The resulting vector is valid as long as the parent vector is valid. Syntax duckdb_vector duckdb_list_vector_get_child ( duckdb_vector vector ); Parameters vector : The vecto...duckdb_struct_vector_get_child Retrieves the child vector of a struct vector. The resulting vector is valid as long as the parent vector is valid. Syntax duckdb_vector duckdb_struct_vector_get_child ( duckdb_vector vector , idx_t index ); Parameters ve... - https://man.mtool.work/duckdb/1.3/clients/c/vector.html
- Securing DuckDB – DuckDB 8313
- 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
...d binary format on the disk. These have the same permissions as SSH keys, 600 , i.e., only user who is running the DuckDB (parent) process can read and write them. Locking Configurations Security-related configuration settings generally lock themselves...'4GB' ; Extensions DuckDB has a powerful extension mechanism, which have the same privileges as the user running DuckDB's (parent) process. This introduces security considerations. Therefore, we recommend reviewing the configuration options for securin... - https://man.mtool.work/duckdb/1.3/operations_manual/securing_duckdb/overview.htm...
- Typecasting – DuckDB 8313
- 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
..._cast_implicitly function . Combination Casting When values of different types need to be combined to an unspecified joint parent type, the system will perform implicit casts to an automatically selected parent type. For example, list_value(1::INT64, 1... - https://man.mtool.work/duckdb/1.3/sql/data_types/typecasting.html
- Star Expression – DuckDB 8313
- 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
...the iterable unpacking behavior in Python , which inspired the * syntax. This implies that the expression expands into the parent expression. An example that shows this difference between COLUMNS and *COLUMNS : With COLUMNS : SELECT coalesce ( COLUMNS...lt FROM ( SELECT NULL a , 42 b , true c ); result result result NULL 42 true With *COLUMNS , the expression expands in its parent expression coalesce , resulting in a single result column: SELECT coalesce ( * COLUMNS ([ 'a' , 'b' , 'c' ])) AS result FR... - https://man.mtool.work/duckdb/1.3/sql/expressions/star.html
- Profiling – DuckDB 8009
- 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
...ion time OPERATOR_CARDINALITY uint64 absolute The cardinality of each operator, i.e., the number of rows it returns to its parent. Operator equivalent of ROWS_RETURNED OPERATOR_ROWS_SCANNED uint64 absolute The total rows scanned by each operator OPERAT...lable to support the optimizer metrics: ALL_OPTIMIZERS : Enables all optimizer metrics and measures the time the optimizer parent node takes. CUMULATIVE_OPTIMIZER_TIMING : The cumulative sum of all optimizer metrics. It is usable without turning on all... - https://man.mtool.work/duckdb/1.3/dev/profiling.html
- Securing Extensions – DuckDB 7705
- 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
...ecuring Extensions DuckDB has a powerful extension mechanism, which have the same privileges as the user running DuckDB's (parent) process. This introduces security considerations. Therefore, we recommend reviewing the configuration options listed on t... - https://man.mtool.work/duckdb/1.3/operations_manual/securing_duckdb/securing_ext...
- Complete API – DuckDB 7544
- 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
...es) duckdb_list_vector_get_child Retrieves the child vector of a list vector. The resulting vector is valid as long as the parent vector is valid. Syntax duckdb_vector duckdb_list_vector_get_child ( duckdb_vector vector ); Parameters vector : The vecto...duckdb_struct_vector_get_child Retrieves the child vector of a struct vector. The resulting vector is valid as long as the parent vector is valid. Syntax duckdb_vector duckdb_struct_vector_get_child ( duckdb_vector vector , idx_t index ); Parameters ve...duckdb_array_vector_get_child Retrieves the child vector of an array vector. The resulting vector is valid as long as the parent vector is valid. The resulting vector has the size of the parent vector multiplied by the array size. Syntax duckdb_vector... - https://man.mtool.work/duckdb/1.3/clients/c/api.html
- R-Tree Indexes – DuckDB 7401
- 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
...mn intersect a specific region of interest, as you can skip searching entire sub-trees if the bounding rectangles of their parent nodes don't intersect the query region at all. Once the leaf nodes are reached, only the specific rows whose geometries in...index, simply use the CREATE INDEX statement with the USING RTREE clause, passing the geometry column to index within the parentheses. For example: -- Create a table with a geometry column CREATE TABLE my_table ( geom GEOMETRY ); -- Create an R-tree i... - https://man.mtool.work/duckdb/1.3/core_extensions/spatial/r-tree_indexes.html
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