Results of 1 - 10 of about 15 for tuples (0.012 sec.)
- Data Chunks – DuckDB 12626
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...k : The data chunk to get the data from Return Value The vector duckdb_data_chunk_get_size Retrieves the current number of tuples in a data chunk. Syntax idx_t duckdb_data_chunk_get_size ( duckdb_data_chunk chunk ); Parameters chunk : The data chunk to...get the data from Return Value The number of tuples in the data chunk duckdb_data_chunk_set_size Sets the current number of tuples in a data chunk. Syntax void duckdb_data_ch...t_size ( duckdb_data_chunk chunk , idx_t size ); Parameters chunk : The data chunk to set the size in size : The number of tuples in the data chunk 関連キーワード chunk duckdb vector size column number types Syntax Parameters chunks count destroy vecto... - https://man.mtool.work/duckdb/1.3/clients/c/data_chunk.html
- Boolean Type – DuckDB 12400
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...10 results in a Boolean value. Boolean values can be used in the WHERE and HAVING clauses of a SQL statement to filter out tuples from the result. In this case, tuples for which the predicate evaluates to true will pass the filter, and tuples for which...NULL NULL true NULL NULL Expressions See Logical Operators and Comparison Operators . 関連キーワード Boolean values truth tuples table integers Logical statement created conjunctions example used filter case predicate evaluates filtered Below conjunct... - https://man.mtool.work/duckdb/1.3/sql/data_types/boolean.html
- GROUP BY Clause – DuckDB 10867
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...ays an aggregate query, even if no aggregations are present in the SELECT clause. When a GROUP BY clause is specified, all tuples that have matching data in the grouping columns (i.e., all tuples that belong to the same group) will be combined. The val...: Syntax 関連キーワード city street clause columns addresses income aggregate grouping Syntax aggregations specified query tuples belong group combined values count wrapped single prevents granularity examples along Examples 関連するページ HAVING Claus... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/groupby.html
- Struct Functions – DuckDB 9108
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...xtract from named STRUCT s. struct[idx] Bracket notation that serves as an alias for struct_extract from unnamed STRUCT s (tuples), using an index (1-based). row(any, ...) Create an unnamed STRUCT (tuple) containing the argument values. struct_concat(s...)['i'] Result 3 struct[idx] Description Bracket notation that serves as an alias for struct_extract from unnamed STRUCT s (tuples), using an index (1-based). Example (row(42, 84))[1] Result 42 row(any, ...) Description Create an unnamed STRUCT (tuple)... - https://man.mtool.work/duckdb/1.3/sql/functions/struct.html
- Samples – DuckDB 8673
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...d for use with percentages. That is because reservoir sampling needs to materialize the entire sample and randomly replace tuples within the materialized sample. The larger the sample size, the higher the performance hit incurred by this process. Reser...included with a chance equal to the specified percentage. As a result, bernoulli sampling can return a different number of tuples even if the same percentage is specified. The expected number of rows is equal to the specified percentage of the table, b...pling percentage. This is a form of cluster sampling. System sampling is more efficient than bernoulli sampling, as no per-tuple selections have to be performed. The expected number of rows is still equal to the specified percentage of the table, but t... - https://man.mtool.work/duckdb/1.3/sql/samples.html
- Complete API – DuckDB 8237
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...ptr : The memory region to de-allocate. duckdb_vector_size The internal vector size used by DuckDB. This is the amount of tuples that will fit into a data chunk created by duckdb_create_data_chunk . Return Value The vector size. Syntax idx_t duckdb_ve...k : The data chunk to get the data from Return Value The vector duckdb_data_chunk_get_size Retrieves the current number of tuples in a data chunk. Syntax idx_t duckdb_data_chunk_get_size ( duckdb_data_chunk chunk ); Parameters chunk : The data chunk to...get the data from Return Value The number of tuples in the data chunk duckdb_data_chunk_set_size Sets the current number of tuples in a data chunk. Syntax void duckdb_data_ch... - https://man.mtool.work/duckdb/1.3/clients/c/api.html
- Python Function API – DuckDB 8237
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...s, set the type parameter to 'arrow' . This will let the system know to provide arrow arrays of up to STANDARD_VECTOR_SIZE tuples to the function, and also expect an array of the same amount of tuples to be returned from the function. Native When the f... - https://man.mtool.work/duckdb/1.3/clients/python/function.html
- Python Client API – DuckDB 7784
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...Relational API page . fetchall ( self : duckdb.duckdb.DuckDBPyRelation ) → list ¶ Execute and fetch all rows as a list of tuples Detailed examples can be found at Relational API page . fetchdf ( self : duckdb.duckdb.DuckDBPyRelation , * , date_as_obje...ny ( self : duckdb.duckdb.DuckDBPyRelation , size : int = 1 ) → list ¶ Execute and fetch the next set of rows as a list of tuples Detailed examples can be found at Relational API page . fetchnumpy ( self : duckdb.duckdb.DuckDBPyRelation ) → dict ¶ Exec...ent property name ¶ duckdb. tokenize ( query : str ) → list ¶ Tokenizes a SQL string, returning a list of (position, type) tuples that can be used for e.g., syntax highlighting duckdb. torch ( * , connection : duckdb.DuckDBPyConnection = None ) → dict... - https://man.mtool.work/duckdb/1.3/clients/python/reference/
- IN Operator – DuckDB 7784
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...ontainment of the left expression inside the collection on the right hand side (RHS). Supported collections on the RHS are tuples, lists, maps and subqueries that return a single column. IN (val1, val2, ...) (Tuple) The IN operator on a tuple (val1, va... - https://man.mtool.work/duckdb/1.3/sql/expressions/in.html
- Tuning Workloads – DuckDB 7575
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...Try rewriting the query to apply a pushdown. Bad join orders where the cardinality of an operator explodes to billions of tuples should be avoided at all costs. Prepared Statements Prepared statements can improve performance when running the same quer... - https://man.mtool.work/duckdb/1.3/guides/performance/how_to_tune_workloads.html
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