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- Boolean Type – DuckDB 14015
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...he predicate evaluates to true will pass the filter, and tuples for which the predicate evaluates to false or NULL will be filtered out. Consider the following example: Create a table with the values 5, 15 and NULL : CREATE TABLE integers ( i INTEGER );...5 ), ( 15 ), ( NULL ); Select all entries where i > 10 : SELECT * FROM integers WHERE i > 10 ; In this case 5 and NULL are filtered out ( 5 > 10 is false and NULL > 10 is NULL ): i 15 Conjunctions The AND / OR conjunctions can be used to combine Boolean...ean values truth tuples table integers Logical statement created conjunctions example used filter case predicate evaluates filtered Below conjunction Operators Documentation Types Copy Markdown Type 関連するページ NULL Values Logical Operators Loops CASE... - https://man.mtool.work/duckdb/1.3/sql/data_types/boolean.html
- R-Tree Indexes – DuckDB 9600
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...s only supported for the GEOMETRY data type. The R-tree index will only be used to perform "index scans" when the table is filtered (using a WHERE clause) with one of the following spatial predicate functions (as they all imply intersection): ST_Equals ,...ate an R-tree index on a geometry column and where we can see that the RTREE_INDEX_SCAN operator is used when the table is filtered with a spatial predicate: INSTALL spatial ; LOAD spatial ; -- Create a table with 10_000_000 random points CREATE TABLE t1... - https://man.mtool.work/duckdb/1.3/core_extensions/spatial/r-tree_indexes.html
- List Functions – DuckDB 8849
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...e, we use x, i , where x is the value and i is the position: SELECT [ 4 , 5 , 6 ] AS l , [ x FOR x , i IN l IF i != 2 ] AS filtered ; l filtered [4, 5, 6] [4, 6] Under the hood, [f(x) FOR x IN y IF g(x)] is translated to list_transform(list_filter(y, x -... - https://man.mtool.work/duckdb/1.3/sql/functions/list.html
- Subqueries – DuckDB 8491
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...for CS it will return 8 . We then compare it against the grade for that actual row. As a result, the row (Math, 9) will be filtered out, as 9 <> 7 . Returning Each Row of the Subquery as a Struct Using the name of a subquery in the SELECT clause (without... - https://man.mtool.work/duckdb/1.3/sql/expressions/subqueries.html
- SELECT Clause – DuckDB 8491
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...addresses ; The DISTINCT clause can be used to return only the unique rows in the result – so that any duplicate rows are filtered out. Queries starting with SELECT DISTINCT run deduplication, which is an expensive operation. Therefore, only use DISTINC... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/select.html
- Samples – DuckDB 8491
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...s such, system sampling is not suitable for data sets with fewer than ~10k rows, where it can happen that all rows will be filtered out, or all the data will be included, even when you ask for 50 PERCENT . Table Samples The TABLESAMPLE and USING SAMPLE c... - https://man.mtool.work/duckdb/1.3/sql/samples.html
- Dot Commands – DuckDB 8116
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...together .width NUM1 NUM2 ... Set minimum column widths for columnar output Using the .help Command The .help text may be filtered by passing in a text string as the first argument. .help m .maxrows COUNT Sets the maximum number of rows for display ( de... - https://man.mtool.work/duckdb/1.3/clients/cli/dot_commands.html
- Information Schema – DuckDB 8116
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...ews in the information_schema are SQL-standard views that describe the catalog entries of the database. These views can be filtered to obtain information about a specific column or table. DuckDB's implementation is based on PostgreSQL's information schem... - https://man.mtool.work/duckdb/1.3/sql/meta/information_schema.html
- Configuration – DuckDB 7758
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...reshold in bytes for when to use a perfect hash table UBIGINT 12 pivot_filter_threshold The threshold to switch from using filtered aggregates to LIST with a dedicated pivot operator UBIGINT 20 pivot_limit The maximum number of pivot columns in a pivot s... - https://man.mtool.work/duckdb/1.3/configuration/overview.html
- Aggregate Functions – DuckDB 7383
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...t. approx_quantile(A, 0.5) approx_top_k(arg, k) Calculates a LIST of the k approximately most frequent values of arg using Filtered Space-Saving. reservoir_quantile(x, quantile, sample_size = 8192) Calculates the approximate quantile using reservoir samp... - https://man.mtool.work/duckdb/1.3/sql/functions/aggregates.html
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