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- ORDER BY Clause 14385
- ORDER BY is an output modifier. Logically it is applied near the very end of the query (just prior to LIMIT or OFFSET , if present). The ORDER BY clause sorts the rows on the sorting criteria in either ascending or descending order. In addi
...er ( NULLS FIRST or NULLS LAST , default is NULLS LAST ). ORDER BY ALL The ALL keyword indicates that the output should be sorted by every column in order from left to right. The direction of this sort may be modified using either ORDER BY ALL ASC or O...t be by itself. See examples below. NULL Order Modifier By default, DuckDB sorts ASC and NULLS LAST , i.e., the values are sorted in ascending order and NULL values are placed last. For the default ASC direction this matches PostgreSQL. Note, however,...o change the direction of the default sorting order to either DESC or ASC : SET default_order = 'DESC'; Collations Text is sorted using the binary comparison collation by default, which means values are sorted on their binary UTF-8 values. While this w... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/orderby.html
- Aggregate Functions 10797
- 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
...⟨aggregate_function⟩(⟨arg⟩, ⟨sep⟩ ORDER BY ⟨ordering_criteria⟩); This clause ensures that the values being aggregated are sorted before applying the function. Most aggregate functions are order-insensitive, and for them this clause is parsed and disca...culates the arg expression at that row. Unlike arg_max , NULL values of arg are not ignored and rows where val is NULL are sorted last, i.e., they are only selected if there are no other rows. If n is specified, returns a LIST containing the arg expres...culates the arg expression at that row. Unlike arg_min , NULL values of arg are not ignored and rows where val is NULL are sorted last, i.e., they are only selected if there are no other rows. If n is specified, returns a LIST containing the arg expres... - https://man.mtool.work/duckdb/2.0/sql/functions/aggregates.html
- Window Functions 9108
- DuckDB supports window functions , which can use multiple rows to calculate a value for each row. Window functions are blocking operators , i.e., they require their entire input to be buffered, making them one of the most memory-intensive o
...that is different from the window ordering. When the ORDER BY argument clause is provided, the values being aggregated are sorted before applying the function. Usually this is not important, but there are some order-sensitive aggregates that can have i...01-04 3 ... ... ... Note that even though the function is computed with an ORDER BY clause, the result does not have to be sorted, so the SELECT also needs to be explicitly sorted if that is desired. Framing Framing specifies a set of rows relative to... - https://man.mtool.work/duckdb/2.0/sql/functions/window_functions.html
- Expression API 8638
- The Expression class represents an instance of an expression . Why Would I Use the Expression API? Use expressions to build filters and computed columns in Python. They are useful when column names or conditions depend on your code. import
...eral, the following order operations can be applied. Operation Description .asc() Indicates that this expression should be sorted in ascending order .desc() Indicates that this expression should be sorted in descending order .nulls_first() Indicates th... - https://man.mtool.work/duckdb/2.0/clients/python/expression.html
- Parquet Tips 8638
- Below is a collection of tips to help when dealing with Parquet files. Tips for Reading Parquet Files Use union_by_name When Loading Files with Different Schemas The union_by_name option can be used to unify the schema of files that have di
...selective queries on those columns scan far fewer row groups: COPY (FROM 'events.parquet' ORDER BY event_time) TO 'events-sorted.parquet' (FORMAT parquet); This pairs well with a ROW_GROUP_SIZE that keeps each row group focused on a narrow range of th... - https://man.mtool.work/duckdb/2.0/data/parquet/tips.html
- Variant Type 8638
- The VARIANT type stores typed, binary data where each row is self-contained with its own type information. This differs from the JSON type , which is physically stored as text. Because type metadata is embedded per-value, VARIANT provides b
..., 3] │ │ 4 │ {'age': 30, 'name': Alice} │ └───────┴────────────────────────────┘ Note that the keys of VARIANT objects are sorted: {'name': 'Alice', 'age': 30}::VARIANT is returned as {'age': 30, 'name': Alice} . Checking the Type of a Value Use varian... - https://man.mtool.work/duckdb/2.0/sql/data_types/variant.html
- Partitioned Writes 8394
- Examples Write a table to a Hive partitioned dataset of Parquet files: COPY orders TO 'orders' (FORMAT parquet, PARTITION_BY (year, month)); Write a table to a Hive partitioned dataset of CSV files, allowing overwrites: COPY orders TO 'orde
...uckDB 2.0, the ORDER_BY copy option sorts the rows before they are written. When combined with PARTITION_BY , the rows are sorted within each partition: COPY orders TO 'orders' (FORMAT parquet, PARTITION_BY (year, month), ORDER_BY (amount DESC NULLS LA... - https://man.mtool.work/duckdb/2.0/data/partitioning/partitioned_writes.html
- Result Verification 8394
- The standard way of verifying results of queries is using the query statement, followed by the letter I times the number of columns that are expected in the result. After the query, four dashes ( ---- ) are expected followed by the result v
...ery query run in the test file. Result Sorting Queries can have an optional field that indicates that the result should be sorted in a specific manner. This field goes in the same location as the connection label. Because of that, connection labels and... - https://man.mtool.work/duckdb/2.0/dev/sqllogictest/result_verification.html
- Collations 8150
- Collations provide rules for how text should be sorted or compared in the execution engine. Collations are useful for localization, as the rules for how text should be ordered are different for different languages or for different countries
... - https://man.mtool.work/duckdb/2.0/sql/expressions/collations.html
- Unity Catalog Extension 7924
- The unity_catalog extension attaches a Unity Catalog catalog, on Databricks or Unity Catalog OSS, as a DuckDB database. You can list, read, insert into and create its Delta Lake tables. It uses the delta extension to access the tables. For
...NOT NULL and PRIMARY KEY column DEFAULT values and generated columns columns of a type that Delta cannot store, e.g., TIME SORTED BY WITH options other than location : unlike with the delta extension , Delta table properties cannot be set Supported Pla... - https://man.mtool.work/duckdb/2.0/core_extensions/unity_catalog.html
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