Results of 1 - 10 of about 16 for exclude (0.002 sec.)
- Star Expression 12147
- 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
...r more details on working with structs. For example: SELECT st.* FROM (SELECT {'x': 1, 'y': 2, 'z': 3} AS st); x y z 1 2 3 EXCLUDE Clause EXCLUDE allows you to exclude specific columns from the * expression. SELECT * EXCLUDE (col) FROM tbl; New As of Du...ckDB 2.0, EXCEPT is accepted as a synonym for EXCLUDE , matching the SQL-standard and BigQuery spelling. The two keywords are interchangeable and may be mixed in the same query...ECT * GLOB 'col*' FROM tbl; SELECT * SIMILAR TO 'col.' FROM tbl; The NOT variants of these operators are also supported to exclude columns that match the pattern: SELECT * NOT SIMILAR TO 'col.' FROM tbl; COLUMNS Expression The COLUMNS expression is simi... - https://man.mtool.work/duckdb/2.0/sql/expressions/star.html
- Python 11246
- The DuckDB Python package has its own repository at duckdb/duckdb-python and uses nanobind 3 to create Python bindings with DuckDB. Prerequisites This guide assumes: You have a full clone of the DuckDB Python package source, including its g
...evelopment Workflow Running Tests Run all tests: uv run --no-build-isolation pytest ./tests --verbose Run fast tests only (excludes slow directory): uv run --no-build-isolation pytest ./tests --verbose --ignore=./tests/slow Test Coverage Build with cove...gnore-errors all \ --gcov-ignore-parse-errors=negative_hits.warn_once_per_file \ --root "$PWD" \ --filter "${PWD}/src" \ --exclude '.*/\.cache/.*' \ --gcov-exclude '.*/\.cache/.*' \ --gcov-exclude '.*/external/.*' \ --gcov-exclude '.*/site-packages/.*'...\ --exclude-unreachable-branches \ --exclude-throw-branches \ --html --html-details -o coverage-cpp.html \ build/coverage/src \ --prin... - https://man.mtool.work/duckdb/2.0/dev/building/python.html
- Window Functions 11124
- 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
...trast, all aggregate window functions (except for list and its aliases, which retain NULL values unless a FILTER condition excludes those rows, e.g., list(x) FILTER (WHERE x IS NOT NULL) ) ignore nulls and do not accept RESPECT NULLS . For example, sum(...ction unless only the sentinel boundary values UNBOUNDED PRECEDING / UNBOUNDED FOLLOWING / CURRENT ROW are used. Using the EXCLUDE clause , rows comparing equal to the current row in the specified ordering expression (so-called peers) can be excluded fr...CURRENT ROW when an ORDER BY clause is present. By default, the CURRENT ROW boundary value (but not the CURRENT ROW in the EXCLUDE clause) means the current row and all its peers when RANGE or GROUP framing are used but it means only the current row whe... - https://man.mtool.work/duckdb/2.0/sql/functions/window_functions.html
- Expression API 10986
- 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
...n(value) when(condition).then(value) CaseExpression(condition, value) fn(name, *args) FunctionExpression(name, *args) star(exclude=...) StarExpression(exclude=...) sql_expr(text) SQLExpression(text) coalesce(*values) CoalesceOperator(*values) a Python f...(2, 1, 1)] Star Expression This expression selects all columns of the input source. Optionally it's possible to provide an exclude list to filter out columns of the table. This exclude list holds column names. To leave out a column of one side of a join..., such as b of t , give it by its parts with the older constructor, as in StarExpression(exclude=[col("t", "b")]) ; star() takes plain names only. import duckdb import pandas as pd df = pd.DataFrame({ 'a': [1, 2, 3, 4],... - https://man.mtool.work/duckdb/2.0/clients/python/expression.html
- UNPIVOT Statement 9461
- The UNPIVOT statement allows multiple columns to be stacked into fewer columns. In the basic case, multiple columns are stacked into two columns: a NAME column (which contains the name of the source column) and a VALUE column (which contain
...how many months are added. The query below returns identical results to the one above. UNPIVOT monthly_sales ON COLUMNS(* EXCLUDE (empid, dept)) INTO NAME month VALUE sales; empid dept month sales 1 electronics Jan 1 1 electronics Feb 2 1 electronics M...CTE, the UNPIVOT keyword can be thought of as taking its place. WITH unpivot_alias AS ( UNPIVOT monthly_sales ON COLUMNS(* EXCLUDE (empid, dept)) INTO NAME month VALUE sales ) SELECT * FROM unpivot_alias; An UNPIVOT may be used in a subquery and must be...t than the SQL Standard Unpivot, as illustrated in subsequent examples. SELECT * FROM ( UNPIVOT monthly_sales ON COLUMNS(* EXCLUDE (empid, dept)) INTO NAME month VALUE sales ) unpivot_alias; Expressions within UNPIVOT Statements DuckDB allows expression... - https://man.mtool.work/duckdb/2.0/sql/statements/unpivot.html
- Friendly SQL 8958
- DuckDB offers several advanced SQL features and syntactic sugar to make SQL queries more concise. We refer to these colloquially as “friendly SQL”. Several of these features were first introduced by DuckDB, while some are inspired by other
...s in the SELECT clause. ORDER BY ALL : shorthand to order on all columns (e.g., to ensure deterministic results). SELECT * EXCLUDE : the EXCLUDE option allows excluding specific columns from the * expression. SELECT * REPLACE : the REPLACE option allows...uses .) COLUMNS() expression can be used to execute the same expression on multiple columns: with regular expressions with EXCLUDE and REPLACE with lambda functions Reusable column aliases (also known as “lateral column aliases”), e.g.: SELECT i + 1 AS... - https://man.mtool.work/duckdb/2.0/sql/dialect/friendly_sql.html
- SET VARIABLE and RESET VARIABLE Statements 8698
- DuckDB supports the definition of SQL-level variables using the SET VARIABLE and RESET VARIABLE statements. Variable Scopes DuckDB supports two levels of variable scopes: Scope Description SESSION Variables with a SESSION scope are local to
...ed_var') AS result; result NULL The getvariable function can also be used in a COLUMNS expression : SET VARIABLE column_to_exclude = 'col1'; CREATE TABLE tbl AS SELECT 12 AS col0, 34 AS col1, 56 AS col2; SELECT COLUMNS(lambda c: c != getvariable('column..._to_exclude')) FROM tbl; col0 col2 12 56 The $name Shorthand New Referencing a variable with the $name shorthand was introduced in Duc... - https://man.mtool.work/duckdb/2.0/sql/statements/set_variable.html
- query and query_table Functions 7797
- The query_table and query functions enable powerful and more dynamic SQL. The query_table function returns the table whose name is specified by its string argument; the query function returns the table obtained by executing the query specif
...TE OR REPLACE MACRO stack(table_name, index, name, values) AS TABLE FROM query( 'UNPIVOT ' || table_name || ' ON COLUMNS(* EXCLUDE (' || array_to_string(index, ', ') || ')) INTO NAME ' || name || ' VALUES ' || values ); WITH cities AS ( FROM ( VALUES ('... - https://man.mtool.work/duckdb/2.0/guides/sql_features/query_and_query_table_func...
- NULL Values 7797
- NULL values are special values that are used to represent missing data in SQL. Columns of any type can contain NULL values. Logically, a NULL value can be seen as “the value of this field is unknown”. A NULL value can be inserted to any fie
...st aggregate functions. Aggregate functions that do not ignore NULL values include: first , last , list and array_agg . To exclude NULL values from these results, use a FILTER clause with a predicate that excludes the relevant null rows, such as list(x)... - https://man.mtool.work/duckdb/2.0/sql/data_types/nulls.html
- Schema 7416
- Types It is important to use the correct type for encoding columns (e.g., BIGINT , DATE , DATETIME ). While it is always possible to use string types ( VARCHAR , etc.) to encode more specific values, this is not recommended. Strings use mor
...WITH rollup AS ( SELECT field_pk, count(*) AS count FROM fact_table NATURAL JOIN dim_table GROUP BY ALL ) SELECT rollup.* EXCLUDE (field_pk), field_name FROM rollup NATURAL JOIN dim_table; Bestpractice DuckDB already applies dictionary encoding to stri... - https://man.mtool.work/duckdb/2.0/guides/performance/schema.html
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