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- Caveats – DuckDB 12996
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...ata Import / JSON Files Copy Markdown Caveats Equality Comparison Warning Currently, equality comparison of JSON files can differ based on the context. In some cases, it is based on raw text comparison, while in other cases, it uses logical content com...physical content of fields: a = c [ 0 ], -- Indeed, field is equal to empty list without space... b != c [ 0 ], -- ... but different from empty list with space. FROM ( SELECT '[]' :: JSON AS a , '[ ]' :: JSON AS b , '[[]]' :: JSON AS c , '[[ ]]' :: JSO...al fields physical empty list Documentation Import Files Copy Markdown Caveats Comparison Warning Currently equality files differ context 関連するページ Directly Reading Files Comparisons Reclaiming Space Full VACUUM Statement List Type See this page a... - https://man.mtool.work/duckdb/1.3/data/json/caveats.html
- Combining Schemas – DuckDB 9285
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...ng from multiple files, we have to combine schemas from those files. That is because each file has its own schema that can differ from the other files. DuckDB offers two ways of unifying schemas of multiple files: by column position and by column name...quent files by column position. This works correctly as long as all files have the same schema. If the schema of the files differs, you might want to use the union_by_name option to allow DuckDB to construct the schema by reading all of the names inste...ad. Below is an example of how both methods work. Union by Position By default, DuckDB unifies the columns of these different files by position . This means that the first column in each file is combined together, as well as the second column in... - https://man.mtool.work/duckdb/1.3/data/multiple_files/combining_schemas.html
- AsOf Join – DuckDB 8828
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...is fine for the ticker column because the value is the same in both tables. However, for the when column, the values might differ between the two tables due to the >= condition used in the AsOf join. The AsOf join is designed to match each row in the l... - https://man.mtool.work/duckdb/1.3/guides/sql_features/asof_join.html
- Reading and Writing Parquet Files – DuckDB 8353
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...an efficient manner, as well as support for pushing filters and projections into the Parquet file scans. Parquet data sets differ based on the number of files, the size of individual files, the compression algorithm used, row group size, etc. These hav... - https://man.mtool.work/duckdb/1.3/data/parquet/overview.html
- Timestamp with Time Zone Functions – DuckDB 7896
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...zone: SELECT '2022-10-08 13:13:34 Europe/Amsterdam' :: TIMESTAMPTZ :: VARCHAR ; 2022-10-08 04:13:34-07 -- the offset will differ based on your local time zone ICU Timestamp with Time Zone Operators The table below shows the available mathematical oper...TIMESTAMP WITH TIME ZONE values. Name Description age(timestamptz, timestamptz) Subtract arguments, resulting in the time difference between the two timestamps. age(timestamptz) Subtract from current_date. date_diff(part, startdate, enddate) The numbe...C' . Note that 2000-01-03 is a Monday. age(timestamptz, timestamptz) Description Subtract arguments, resulting in the time difference between the two timestamps. Example age(TIMESTAMPTZ '2001-04-10', TIMESTAMPTZ '1992-09-20') Result 8 years 6 months 20... - https://man.mtool.work/duckdb/1.3/sql/functions/timestamptz.html
- Spatial Functions – DuckDB 7439
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...roid Returns if two POINT_2D's are within a target distance in meters, using an ellipsoidal model of the earths surface ST_Difference Returns the "difference" between two geometries ST_Dimension Returns the "topological dimension" of a geometry. ST_Dis...distance between two arbitrary points taking the curvature of the earths surface into account, but is also the slowest. ST_Difference Signature GEOMETRY ST_Difference ( geom1 GEOMETRY , geom2 GEOMETRY ) Description Returns the "difference" between two...EWKB ( hexwkb VARCHAR ) Description Deserialize a GEOMETRY from a HEX(E)WKB encoded string DuckDB spatial doesnt currently differentiate between WKB and EWKB , so ST_GeomFromHEXWKB and `ST_GeomFromHEXEWKB" are just aliases of eachother. ST_GeomFromHEXW... - https://man.mtool.work/duckdb/1.3/core_extensions/spatial/functions.html
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