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- Window Functions – DuckDB 14248
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...rent row without gaps; this function counts peer groups. first_value(expr[ ORDER BY ordering][ IGNORE NULLS]) Returns expr evaluated at the row that is the first row (with a non-null value of expr if IGNORE NULLS is set) of the window frame. lag(expr[, of...fset[, default]][ ORDER BY ordering][ IGNORE NULLS]) Returns expr evaluated at the row that is offset rows (among rows with a non-null value of expr if IGNORE NULLS is set) before the current row wi...me; if there is no such row, instead return default (which must be of the Same type as expr ). Both offset and default are evaluated with respect to the current row. If omitted, offset defaults to 1 and default to NULL . last_value(expr[ ORDER BY ordering... - https://man.mtool.work/duckdb/1.3/sql/functions/window_functions.html
- Constraints – DuckDB 8956
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...r: NOT NULL constraint failed: students.id Warning Indexes have certain limitations that might result in constraints being evaluated too eagerly, leading to constraint errors such as violates primary key constraint and violates unique constraint . See the...y constraint that is defined in the table. Warning Indexes have certain limitations that might result in constraints being evaluated too eagerly, leading to constraint errors such as violates primary key constraint and violates unique constraint . See the... - https://man.mtool.work/duckdb/1.3/sql/constraints.html
- Relational API on Pandas – DuckDB 8402
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...ational API on Pandas DuckDB offers a relational API that can be used to chain together query operations. These are lazily evaluated so that DuckDB can optimize their execution. These operators can act on Pandas DataFrames, DuckDB tables or views (which c... - https://man.mtool.work/duckdb/1.3/guides/python/relational_api_pandas.html
- Pivot Internals – DuckDB 8402
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...rating on a list of the column names and a list of the column values. If dynamically unpivoting, the COLUMNS expression is evaluated first to calculate the column list. For example: UNPIVOT monthly_sales ON jan , feb , mar , apr , may , jun INTO NAME mont... - https://man.mtool.work/duckdb/1.3/internals/pivot.html
- CASE Expression – DuckDB 8402
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...expression can be chained, whenever any of the conditions returns true for a single tuple, the corresponding expression is evaluated and returned. CREATE OR REPLACE TABLE integers AS SELECT unnest ([ 1 , 2 , 3 ]) AS i ; SELECT i , CASE WHEN i = 1 THEN 10... - https://man.mtool.work/duckdb/1.3/sql/expressions/case.html
- Star Expression – DuckDB 8295
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...id min_number 1 10 COLUMNS Lambda Function COLUMNS also supports passing in a lambda function. The lambda function will be evaluated for all columns present in the FROM clause, and only columns that match the lambda function will be returned. This allows... - https://man.mtool.work/duckdb/1.3/sql/expressions/star.html
- Relational API – DuckDB 8187
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...██████████████████▏ Relation Creation This section contains the details on how a relation is created. The methods are lazy evaluated . Name Description from_arrow Create a relation object from an Arrow object from_csv_auto Create a relation object from th...WITH TIME ZONE] Transformation This section contains the methods which can be used to chain queries. The methods are lazy evaluated . Name Description aggregate Compute the aggregate aggr_expr by the optional groups group_expr on the relation apply Compu...ction contains the functions which can be applied to a relation, in order to get a (scalar) result. The functions are lazy evaluated . Name Description any_value Returns the first non-null value from a given column arg_max Finds the row with the maximum v... - https://man.mtool.work/duckdb/1.3/clients/python/relational_api.html
- WITH Clause – DuckDB 8187
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...query is expensive, materializing it with the MATERIALIZED keyword can improve performance. In this case, complex_query is evaluated only once. WITH t ( x ) AS MATERIALIZED ( complex_query ) SELECT * FROM t AS t1 , t AS t2 , t AS t3 ; If one wants to disa... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/with.html
- Integration with Ibis – DuckDB 8080
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...ill_length_mm float64 bill_depth_mm float64 flipper_length_mm int64 body_mass_g int64 sex string year int64 Ibis is lazily evaluated, so instead of seeing the data, we see the schema of the table. To peek at the data, we can call head and then to_pandas t... - https://man.mtool.work/duckdb/1.3/guides/python/ibis.html
- SQL Introduction – DuckDB 8080
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...ts because the WHERE clause determines which rows will be included in the aggregate calculation; so obviously it has to be evaluated before aggregate functions are computed. However, as is often the case the query can be restated to accomplish the desired... - https://man.mtool.work/duckdb/1.3/sql/introduction.html
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