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List Functions 12668
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 <-> ... as for list_cosine_distance . list1 <@ list2 Alias for list_has_all . list1 @> list2 Alias for list_has_all . arg1 || arg2 Concatenates two strings, lists, or blobs. Any NULL input results in NULL . See also concat(arg1, arg2, ...) and list_concat(list1, lis ... end, step) Alias for list_slice . array_sort(list[, col1][, col2]) Alias for list_sort . array_to_string(list, delimiter) Concatenates list/array elements using an optional delimiter . array_to_string_comma_default(array) Concatenates list/array elements wi ... e]) Alias for list_zip . char_length(list) Alias for length . character_length(list) Alias for length . concat(value, ...) Concatenates multiple strings or lists. NULL inputs are skipped. See also operator || . contains(list, element) Returns true if the lis ...
https://man.mtool.work/duckdb/2.0/sql/functions/list.html
Text Functions 9942
Text Functions and Operators This section describes functions and operators for examining and manipulating STRING values . Function Description string[index] Extracts a single character using a (1-based) index . string[begin:end] Extracts a ... true if the string matches the regex (see Pattern Matching ). string ^@ search_string Alias for starts_with . arg1 || arg2 Concatenates two strings, lists, or blobs. Any NULL input results in NULL . See also concat(arg1, arg2, ...) and list_concat(list1, lis ... chr(code_point) Returns a character which is corresponding the ASCII code value or Unicode code point. concat(value, ...) Concatenates multiple strings or lists. NULL inputs are skipped. See also operator || . concat_ws(separator, string, ...) Concatenates ... g ). | | Example | 'hello' SIMILAR TO 'l+' | | Result | false | | Alias | regexp_full_match | arg1 || arg2 | Description | Concatenates two strings, lists, or blobs. Any NULL input results in NULL . See also concat(arg1, arg2, ...) and list_concat(list1, lis ...
https://man.mtool.work/duckdb/2.0/sql/functions/text.html
Blob Functions 9742
This section describes functions and operators for examining and manipulating BLOB values . Function Description arg1 || arg2 Concatenates two strings, lists, or blobs. Any NULL input results in NULL . See also concat(arg1, arg2, ...) and l ... sentation to a blob. unhex(value) Converts a value from hexadecimal representation to a blob. arg1 || arg2 | Description | Concatenates two strings, lists, or blobs. Any NULL input results in NULL . See also concat(arg1, arg2, ...) and list_concat(list1, lis ...
https://man.mtool.work/duckdb/2.0/sql/functions/blob.html
Aggregate Functions 9106
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 ... roduct(arg) Calculates the product of all non-null values in arg . This function is affected by ordering . string_agg(arg) Concatenates the column string values with a comma separator ( , ). This function is affected by ordering . string_agg(arg, sep) Concat ... on-null values in arg . This function is affected by ordering . | | Example | product(A) | string_agg(arg) | Description | Concatenates the column string values with a comma separator ( , ). This function is affected by ordering . | | Example | string_agg(S, ... ',') | | Alias(es) | group_concat(arg) , listagg(arg) | string_agg(arg, sep) | Description | Concatenates the column string values with a separator. This function is affected by ordering . | | Example | string_agg(S, ',') | | Al ...
https://man.mtool.work/duckdb/2.0/sql/functions/aggregates.html
Expression API 7633
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 ... er the expression is not NULL .collate(collation: str) Compares and sorts by a collation , such as nocase .concat(*values) Concatenates text values [key] Takes a field of a STRUCT by name, an element of a list by position, counting from 1, or an entry of a m ...
https://man.mtool.work/duckdb/2.0/clients/python/expression.html
Python Client API 7433
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 ... n : str , sep : str = ',' , groups : str = '' , window_spec : str = '' , projected_columns : str = '' ) → DuckDBPyRelation Concatenates the values present in a given expression with a separator. Detailed examples can be found at Relational API page . sum ( e ... sion Number of bits in a string . SQL: bit_length . concat_ws ( separator : ValueOrExpr , * args : ValueOrExpr ) → StrExpr Concatenates many strings, separated by separator . Arguments: separator. SQL: concat_ws . contains ( * args : ValueOrExpr ) → Expressi ...
https://man.mtool.work/duckdb/2.0/clients/python/reference/
Relational API 7015
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 ... rd deviation for a given expression. stddev_samp Computes the sample standard deviation for a given expression. string_agg Concatenates the values present in a given expression with a separator. sum Computes the sum of all values present in a given expressio ...
https://man.mtool.work/duckdb/2.0/clients/python/relational_api.html
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