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- GROUP BY Clause 12577
- The GROUP BY clause specifies which grouping columns should be used to perform any aggregations in the SELECT clause. If the GROUP BY clause is specified, the query is always an aggregate query, even if no aggregations are present in the SE
...se. 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 values of the grouping columns themselves are unchanged, and any other columns ca...gs) GROUP BY unnest(tags) ORDER BY tag; tag n a 1 b 3 c 1 Examples Count the number of entries in the addresses table that belong to each different city: SELECT city, count(*) FROM addresses GROUP BY city; Compute the average income per city per street... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/groupby.html
- HAVING Clause 11105
- The HAVING clause can be used after the GROUP BY clause to provide filter criteria after the grouping has been completed. In terms of syntax the HAVING clause is identical to the WHERE clause, but while the WHERE clause occurs before the gr
...ouping, the HAVING clause occurs after the grouping. Examples Count the number of entries in the addresses table that belong to each different city , filtering out cities with a count below 50: SELECT city, count(*) FROM addresses GROUP BY city HA... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/having.html
- Connect 8742
- Overview The Go client works through the standard database/sql types: a *sql.DB is a pool of connections to a DuckDB database. This page covers opening in-memory and file-backed databases, passing DuckDB configuration options, running initi
...penDB() . The connector's second argument is a callback that runs against each new connection, which is where boot queries belong: connector, err := duckdb.NewConnector("/path/to/foo.db?threads=4", func(execer driver.ExecerContext) error { bootQueries... - https://man.mtool.work/duckdb/2.0/clients/go/connecting.html
- Appender 7852
- Appenders are the most efficient way of loading data into DuckDB from within the C interface, and are recommended for fast data loading. The appender is much faster than using prepared statements or individual INSERT INTO statements. Append
...Value DuckDBSuccess on success or DuckDBError on failure. duckdb_appender_column_count Returns the number of columns that belong to the appender. If there is no active column list, then this equals the table's physical columns. Syntax idx_t duckdb_app... - https://man.mtool.work/duckdb/2.0/clients/c/appender.html
- Release Cycle 7852
- This document outlines the DuckDB and core extension release cycle framework. It is intended for developers working on DuckDB extensions to better understand the underlying processes. Overview DuckDB follows Semantic Versioning ( v<MAJOR>.<
...nsions in three different groups, as extensions share the same release cycle based on which of these three categories they belong to. In-tree extensions Unstable API extensions Stable API extensions We will now go over the release cycles of the three d... - https://man.mtool.work/duckdb/2.0/dev/release_cycle.html
- SQL Introduction 7852
- This page provides an overview of how to perform simple operations in SQL. This tutorial is only intended to give you an introduction and is in no way a complete tutorial on SQL. This tutorial is adapted from the PostgreSQL tutorial . DuckD
...0.0 1994-11-29 53.000 -194.000 Since the columns all had different names, the parser automatically found which table they belong to. If there were duplicate column names in the two tables you'd need to qualify the column names to show which one you me...can do the following to delete those rows from the table: DELETE FROM weather WHERE city = 'Hayward'; All weather records belonging to Hayward are removed. SELECT * FROM weather; city temp_lo temp_hi prcp date San Francisco 46 50 0.25 1994-11-27 San F... - https://man.mtool.work/duckdb/2.0/sql/introduction.html
- Vectors 7561
- Vectors represent a horizontal slice of a column. They hold a number of values of a specific type, similar to an array. Vectors are the core data representation used in DuckDB. Vectors are typically stored within data chunks . The vector an
...es. 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 have the same size. Primitive Types For primitive types, the underlying array can be obtained using the du... - https://man.mtool.work/duckdb/2.0/clients/c/vector.html
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