Results of 1 - 10 of about 32 for except (0.003 sec.)
- Set Operations 16609
- Set operations allow queries to be combined according to set operation semantics . Set operations refer to the UNION [ALL] , INTERSECT [ALL] and EXCEPT [ALL] clauses. The vanilla variants use set semantics, i.e., they eliminate duplicates,
...ates are returned. SELECT unnest([5, 5, 6, 6, 6, 6, 7, 8]) AS x INTERSECT ALL SELECT unnest([5, 6, 6, 7, 7, 9]); x 5 6 6 7 EXCEPT The EXCEPT clause can be used to select all rows that only occur in the left query. Vanilla EXCEPT (Set Semantics) Vanilla...EXCEPT follows set semantics, therefore, it performs duplicate elimination, so only unique rows are returned. SELECT * FROM range...(5) t1(x) EXCEPT SELECT * FROM range(2) t2(x); x 2 3 4 EXCEPT ALL (Bag Semantics) EXCEPT ALL uses bag semantics: SELECT unnest([5, 5, 6, 6,... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/setops.html
- Avro Extension 9021
- The avro extension enables DuckDB to read Apache Avro files. The avro extension was released as a community extension in late 2024 and became a core extension in early 2025. The read_avro Function The extension adds a single DuckDB function
...Conversion This extension automatically translates the Avro Schema to the DuckDB schema. All Avro types can be translated, except for recursive type definitions , which DuckDB does not support. The type mapping is very straightforward except for Avro's... - https://man.mtool.work/duckdb/2.0/core_extensions/avro.html
- Indexing 8892
- DuckDB uses 1-based indexing except for JSON objects , which use 0-based indexing. Examples The index origin is 1 for strings, lists, etc. SELECT list[1] AS element FROM (SELECT ['first', 'second', 'third'] AS list); ┌─────────┐ │ element │
... - https://man.mtool.work/duckdb/2.0/sql/dialect/indexing.html
- Delta Extension 8506
- The delta extension adds support for the Delta Lake open-source storage format . It is built using the Delta Kernel . The extension reads Delta tables, local and remote, and writes them: it can create tables and append to them. For implemen
...database and only fails on the first read. Table Properties Options in a WITH clause are stored as Delta table properties, except location , which must match the attached path: ATTACH 's3://⟨my_bucket⟩/⟨other_path⟩' AS audit (TYPE delta); CREATE TABLE...elta feature, such as deletion vectors, also upgrade the table's protocol as needed. Values can be any constant expression except NULL . Some properties cannot be set at creation, such as 'delta.enableVariantShredding' . To create a table with column m...ng tables with deletion vectors column mapping in name and id mode time travel by version or timestamp all primitive types except intervals nested types (structs, lists and maps) creating tables ( CREATE TABLE ) blind appends ( INSERT INTO ), with file... - https://man.mtool.work/duckdb/2.0/core_extensions/delta.html
- DELETE Statement 8506
- The DELETE statement removes rows from the table identified by the table-name. If the WHERE clause is not present, all records in the table are deleted. If a WHERE clause is supplied, then only those rows for which the WHERE clause results
...s. RETURNING Clause The RETURNING clause allows returning the deleted values. It uses the same syntax as the SELECT clause except the DISTINCT modifier is not supported. CREATE TABLE employees (name VARCHAR, age INTEGER); INSERT INTO employees VALUES (... - https://man.mtool.work/duckdb/2.0/sql/statements/delete.html
- Star Expression 8377
- Syntax The * expression can be used in a SELECT statement to select all columns that are projected in the FROM clause. SELECT * FROM tbl; TABLE.* and STRUCT.* The * expression can be prepended by a table name to select only columns from tha
...CLUDE allows you to exclude specific columns from the * expression. SELECT * EXCLUDE (col) FROM tbl; New As of DuckDB 2.0, EXCEPT is accepted as a synonym for EXCLUDE , matching the SQL-standard and BigQuery spelling. The two keywords are interchangeab...le and may be mixed in the same query. sql SELECT * EXCEPT (col) FROM tbl; REPLACE Clause REPLACE allows you to replace specific columns by alternative expressions. SELECT * REPLACE... - https://man.mtool.work/duckdb/2.0/sql/expressions/star.html
- Aggregate Functions 8248
- Examples Produce a single row containing the sum of the amount column: SELECT sum(amount) FROM sales; Produce one row per unique region, containing the sum of amount for each group: SELECT region, sum(amount) FROM sales GROUP BY region; Ret
...ER BY s DESC) AS countdown FROM tbl; countdown 3, 2, 1 Handling NULL Values All general aggregate functions ignore NULL s, except for list ( array_agg ), first ( arbitrary ) and last . To exclude NULL s from list , use a FILTER clause that excludes row...LL values in the list. To ignore NULL s from first , you can use the any_value aggregate . All general aggregate functions except count return NULL on empty groups. In particular, list does not return an empty list, sum does not return zero, and string...pecified order) value of x . Intuitively, assigns to each value of x an equisized sub-interval (left-open and right-closed except for the initial interval) of the interval [0, 1] , and picks the value of the sub-interval that contains pos . This is Typ... - https://man.mtool.work/duckdb/2.0/sql/functions/aggregates.html
- Relational API 8119
- The Relational API builds a query one step at a time from Python. A relation, a DuckDBPyRelation , is a piece of SQL text: the methods of the Transformation and Functions sections return a new relation whose text extends the one they were c
...rom the CSV file in 'name'. The options other than path_or_buffer are keyword arguments; an unknown one raises InvalidInputException . Most are the option of the same name of the SQL read_csv function ; sep and delimiter are delim , dtype is dtypes , n...ing : str, keyword-only, default: None Only UTF-8 is accepted, written 'utf-8' or 'utf8' ; any other encoding raises BinderException . * parallel : bool, keyword-only, default: None Whether to use the parallel CSV reader. * date_format : str, keyword-o...nct Retrieve distinct rows from this relation object, or the first row of each distinct value of on . drop Remove columns. except_ Create the set except of this relation object with another relation object in other_rel. filter Filter the relation objec... - https://man.mtool.work/duckdb/2.0/clients/python/relational_api.html
- Overview of DuckDB Internals 7990
- Tip For a detailed explanation of DuckDB internals, see the Design and Implementation of DuckDB Internals ("DiDi") library entry. On this page is a brief description of the internals of the DuckDB engine. Parser The parser converts a query
...tes what it represents, e.g., a comparison is represented as a ComparisonExpression . ParsedExpressions do not have types, except for nodes with explicit types such as CAST statements. The types for expressions are resolved in the Binder, not in the Pa... - https://man.mtool.work/duckdb/2.0/internals/overview.html
- Conversion between DuckDB and Python 7861
- This page documents the rules for converting DuckDB results to Python and Python objects to DuckDB . Result Conversion: DuckDB Results to Python A result is read from a relation or, when using the DB-API / con.execute() , from the connectio
..., both make a copy Polars pl() PyTorch torch() torch() TensorFlow tf() tf() Relations are recommended for most conversion, except when you want to do row-based work. A relation has no fetchone() , fetchmany() or fetch_df_chunk() because it is stateless...values() , as constants in expressions and as the value of a duckdb.Value . The rules are the same on all of these paths, except where a section below says otherwise. This is a mapping of Python object types to DuckDB Logical Types : None → NULL bool...s follows. str A str that UTF-8 cannot encode, such as one that holds a lone surrogate ( "\ud800" ), raises an InvalidInputException that says it cannot encode str as UTF-8 . The connection stays usable. memoryview A memoryview converts to a BLOB of th... - https://man.mtool.work/duckdb/2.0/clients/python/conversion.html
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