Results of 1 - 7 of about 7 for duplicates (0.004 sec.)
- Set Operations 12704
- 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,
...t1(x) INTERSECT SELECT * FROM range(6) t2(x); x 0 1 INTERSECT ALL (Bag Semantics) INTERSECT ALL follows bag semantics, so duplicates 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 EXCE... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/setops.html
- List Functions 10160
- Function Description list[index] Extracts a single list element using a (1-based) index . list[begin[:end][:step]] Extracts a sublist using slice conventions . Negative values are accepted. list1 && list2 Alias for list_has_any . list1 <->
...an distance between two points with coordinates given in two inputs lists of equal length. list_distinct(list) Removes all duplicates and NULL values from a list. Does not preserve the original order. list_dot_product(list1, list2) Alias for list_inner_pro...-sized lists. list_intersect(list1, list2) Returns a list of all the elements that exist in both list1 and list2 , without duplicates. list_kurtosis(list) Applies aggregate function kurtosis to the list . list_kurtosis_pop(list) Applies aggregate function...e | list_distance([1, 2, 3], [1, 2, 5]) | | Result | 2.0 | | Alias | <-> | list_distinct(list) | Description | Removes all duplicates and NULL values from a list. Does not preserve the original order. | | Example | list_distinct([1, 1, NULL, -3, 1, 5]) | |... - https://man.mtool.work/duckdb/2.0/sql/functions/list.html
- Overview of DuckDB Internals 9742
- 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
...Rewriter : Simplifies expressions, performs constant folding Filter Pushdown : Pushes filters down into the query plan and duplicates filters over equivalency sets. Also prunes subtrees that are guaranteed to be empty (because of filters that statically ev... - https://man.mtool.work/duckdb/2.0/internals/overview.html
- Relational API 8469
- 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
...object with another relation object in other_rel. union_by_name Rows from both relations, matching columns by name; keeps duplicates unless all is false. unnest Expand list columns to one row per element. unpivot Turn the named columns into rows; name and...Create the set except of this relation object with another relation object in other_rel. The difference is EXCEPT ALL , so duplicates count: a row that appears three times in this relation and once in other_rel appears twice in the result. Parameters other...set intersection of this relation object with another relation object in other_rel. The intersection is INTERSECT ALL , so duplicates count: a row that appears three times in this relation and twice in other_rel appears twice in the result. Parameters othe... - https://man.mtool.work/duckdb/2.0/clients/python/relational_api.html
- ALTER TABLE Statement 8051
- The ALTER TABLE statement changes the schema of an existing table in the catalog. Examples CREATE TABLE integers (i INTEGER, j INTEGER); Add a new column with name k to the table integers , it will be filled with the default value NULL : AL
...T i_pk PRIMARY KEY (i); If the existing data violates the constraint, the statement fails: Constraint Error: Data contains duplicates on indexed column(s) SET / RESET (Table Options) This feature was introduced in DuckDB 1.5. Modify table options after tab... - https://man.mtool.work/duckdb/2.0/sql/statements/alter_table.html
- Python Client API 7215
- Connection class duckdb. Appender Bases: object append_row ( self , * args ) → None Buffer one row, one value per column, each converted as an executemany parameter would be append_rows ( self , rows : object ) → None Buffer each row of an
...: DuckDBPyRelation , * , all : bool = True ) → DuckDBPyRelation Rows from both relations, matching columns by name; keeps duplicates unless all is false. Detailed examples can be found at Relational API page . unique ( unique_aggr : str ) → DuckDBPyRelati...ween two lists of numbers. Arguments: list2. SQL: list_distance . distinct ( * args : ValueOrExpr ) → ListExpr Removes all duplicates and NULL values from a list. SQL: list_distinct . entropy ( * args : ValueOrExpr ) → Expression The entropy of the element... - https://man.mtool.work/duckdb/2.0/clients/python/reference/
- WITH Clause 7215
- The WITH clause allows you to specify common table expressions (CTEs). Regular (non-recursive) common-table-expressions are essentially views that are limited in scope to a particular query. CTEs can reference each other and can be nested.
..., which invokes the same CTE three times: WITH t(x) AS (⟨complex_query⟩) SELECT * FROM t AS t1, t AS t2, t AS t3; Inlining duplicates the definition of t for each reference which results in the following query: SELECT * FROM (⟨complex_query⟩) AS t1(x), (⟨c... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/with.html
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