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- Map Functions 11228
- Name Description cardinality(map) Return the size of the map (or the number of entries in the map). element_at(map, key) Return the value for a given key as a list, or an empty list if the key is not contained in the map. The type of the ke
...f the map's keys; else, an error is thrown. map_concat(maps...) Returns a map created from merging the input maps . On key collision the value is taken from the last map with that key. map_contains(map, key) Checks if a map contains a given key. map_conta...s | map_extract(map, key) | map_concat(maps...) | Description | Returns a map created from merging the input maps . On key collision the value is taken from the last map with that key. | | Example | map_concat(MAP {'key1': 10, 'key2': 20}, MAP {'key3': 30... - https://man.mtool.work/duckdb/2.0/sql/functions/map.html
- Reading Multiple Files 7485
- DuckDB can read multiple files of different types (CSV, Parquet, JSON files) at the same time using either the glob syntax, or by providing a list of files to read. See the combining schemas page for tips on reading files with different sch
...e of the added column. This is useful when the source data already contains a filename column and you want to avoid a name collision. Glob Function to Find Filenames The glob pattern matching syntax can also be used to search for filenames using the glob... - https://man.mtool.work/duckdb/2.0/data/multiple_files/overview.html
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