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- Numeric Types 11991
- Fixed-Width Integer Types The types TINYINT , SMALLINT , INTEGER , BIGINT and HUGEINT store whole numbers, that is, numbers without fractional components, of various ranges. Attempts to store values outside of the allowed range will result
...owever, if you use the results for anything important, you should evaluate your implementation carefully for corner cases (ranges, infinities, underflows, invalid operations) that may be handled differently from what you expect and you should familiari...typically has a range of around 1E-307 to 1E+308 with a precision of at least 15 digits. Positive numbers outside of these ranges (and negative numbers outside the mirrored ranges) may cause errors on some platforms but will usually be converted to zer... - https://man.mtool.work/duckdb/2.0/sql/data_types/numeric.html
- Parquet Tips 11077
- Below is a collection of tips to help when dealing with Parquet files. Tips for Reading Parquet Files Use union_by_name When Loading Files with Different Schemas The union_by_name option can be used to unify the schema of files that have di
...et row groups in parallel even within the same file and uses predicate pushdown to only scan the row groups whose metadata ranges match the WHERE clause of the query. However, there is some overhead associated with reading the metadata in each group. A...h a query's WHERE clause. Sorting the data on the columns that you filter on most often before writing makes these min/max ranges tight and non-overlapping between row groups, so that highly selective queries on those columns scan far fewer row groups:... - https://man.mtool.work/duckdb/2.0/data/parquet/tips.html
- List Functions 8975
- 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 <->
...on generates indexes along the dim th dimension of array arr . SELECT generate_subscripts([4, 5, 6], 1) AS i; i 1 2 3 Date Ranges Date ranges are also supported for TIMESTAMP and TIMESTAMP WITH TIME ZONE values. Note that for these types, the stop and...step arguments have to be specified explicitly (a default value is not provided). range for Date Ranges SELECT * FROM range(DATE '1992-01-01', DATE '1992-03-01', INTERVAL '1' MONTH); range 1992-01-01 00:00:00 1992-02-01 00:00:...00 generate_series for Date Ranges SELECT * FROM generate_series(DATE '1992-01-01', DATE '1992-03-01', INTERVAL '1' MONTH); generate_series 1992-01-01 00:00:... - https://man.mtool.work/duckdb/2.0/sql/functions/list.html
- DuckDB Wasm Client 8079
- Installation To use the DuckDB Wasm client, visit the duckdb-wasm GitHub repository . The latest stable version of the DuckDB WebAssembly client is 2.0.0. DuckDB-Wasm is a version of DuckDB that has been compiled to WebAssembly , the portab
...avior depends on which httpfs path serves the request. The JavaScript httpfs implementation fetches only the required byte ranges, but reading through the built-in httpfs extension may currently download the whole file instead (see duckdb-wasm issue #2... - https://man.mtool.work/duckdb/2.0/clients/wasm/overview.html
- I/O 7768
- Warning DuckDB ships with safe defaults. The configuration options described on this page are advanced options, so proceed with caution when changing them. Asynchronous I/O New Asynchronous I/O was introduced in DuckDB 2.0. Starting with v2
...threads busy, DuckDB reads ahead: it schedules the reads for upcoming scan jobs (e.g., row groups in Parquet files or byte ranges in CSV files) before the worker threads need them. While a worker thread processes the current job, the asynchronous threa... - https://man.mtool.work/duckdb/2.0/data/io.html
- Configuration 6873
- DuckDB has a number of configuration options that can be used to change the behavior of the system. The configuration options can be set using either the SET statement or the PRAGMA statement . They can be reset to their original values usi
...reading the same files multiple times BOOLEAN false parquet_prefetch_column_gap Byte gap under which Parquet prefetch I/O ranges are coalesced (NULL lets the cost model adapt it) UBIGINT NULL partitioned_write_flush_threshold The number of rows thresh... - https://man.mtool.work/duckdb/2.0/configuration/overview.html
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