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Functions 12445
Function Syntax Function Chaining via the Dot Operator DuckDB supports the dot syntax for function chaining. This allows the function call fn(arg1, arg2, arg3, ...) to be rewritten as arg1.fn(arg2, arg3, ...) . For example, take the followi ... ]) breed(goose_name); Using with Literals and Arrays String literals and array access operations can be used with function chaining directly: SELECT 'hello world'.replace(' ', '_'); SELECT m[1].map_entries() FROM (VALUES ([MAP {'hello': 42}, MAP {'world' ... : 42}])) t(m); To apply function chaining to numeric literals, you must surround the literal with parentheses, e.g.: SELECT (2).sqrt(); In the absence of these pare ... (); ), DuckDB returns a Parser Error for the function call: Parser Error: syntax error at or near "(" Limitations Function chaining via the dot operator is limited to scalar functions and is not supported for table functions. For example, the following c ...
https://man.mtool.work/duckdb/2.0/sql/functions/overview.html
Integration with Ibis 8229
Ibis is a Python dataframe library that supports 20+ backends, with DuckDB as the default. Ibis with DuckDB provides a Pythonic interface for SQL with great performance. Warning Ibis 12.0.0 and earlier do not support DuckDB 2.0. The example ... 51.094118 │ 212 │ │ … │ … │ … │ … │ … │ └───────────┴───────────┴────────┴──────────────────────┴────────────────────────┘ Chaining It All Together We've already chained some Ibis calls together. We used mutate to create a new column and then select to o ... nly view a subset of the new table. We were just chaining group_by with aggregate . There's nothing stopping us from putting all of these concepts together to ask questions of the ...
https://man.mtool.work/duckdb/2.0/guides/python/ibis.html
Friendly SQL 8136
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 ... . Filename expansion (globbing) , e.g.: FROM 'my-data/part-*.parquet' Functions and Expressions Dot operator for function chaining : SELECT ('hello').upper() String formatters: the format() function with the fmt syntax and the printf() function List com ...
https://man.mtool.work/duckdb/2.0/sql/dialect/friendly_sql.html
Collations 8136
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 ... hElLO'; true SELECT 'hello' = 'hëllo'; false SELECT 'hello' COLLATE NOACCENT = 'hëllo'; true Collations can be combined by chaining them using the dot operator. Note, however, that not all collations can be combined together. In general, the NOCASE colla ...
https://man.mtool.work/duckdb/2.0/sql/expressions/collations.html
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