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DuckDB 1.3 ドキュメント 全文検索
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- Constraints – DuckDB 13486
- This page is for DuckDB 1.3, which is outdated.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
...temap Live Demo Documentation / SQL Copy Markdown Constraints In SQL, constraints can be specified for tables. Constraints enforce certain properties over data that is inserted into a table. Constraints can be specified along with the schema of the tabl...rbitrary Boolean expression. Any columns that do not satisfy this expression violate the constraint. For example, we could enforce that the name column does not contain spaces using the following CHECK constraint. CREATE TABLE students ( name VARCHAR CH...umn cannot contain any NULL values. By default, all columns in tables are nullable. Adding NOT NULL to a column definition enforces that a column cannot contain NULL values. CREATE TABLE students ( name VARCHAR NOT NULL ); INSERT INTO students VALUES (... - https://man.mtool.work/duckdb/1.3/sql/constraints.html
- Non-Deterministic Behavior – DuckDB 8560
- This page is for DuckDB 1.3, which is outdated.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
...owing workarounds: Limit the number of threads to prevent non-determinism introduced by multi-threading. SET threads = 1 ; Enforce ordering. For example, you can use the ORDER BY ALL clause : SELECT * FROM ( SELECT 'A' AS x UNION SELECT 'B' AS x ) ORDER... - https://man.mtool.work/duckdb/1.3/operations_manual/non-deterministic_behavior.h...
- Securing Extensions – DuckDB 8560
- This page is for DuckDB 1.3, which is outdated.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
..., and routinely install a staggering amount of transitive dependencies without thinking twice. Some repositories like CRAN enforce a human inspection at some point, but that's no guarantee for anything either. We've studied several different approaches... - https://man.mtool.work/duckdb/1.3/operations_manual/securing_duckdb/securing_ext...
- Comparisons – DuckDB 8560
- 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
...ions evaluate and return true in DuckDB but fail in PostgreSQL. SELECT 1 = true ; SELECT 1 = '1.1' ; It is not possible to enforce stricter type-checking for DuckDB's comparison operators. If you require stricter type-checking, we recommend creating a m... - https://man.mtool.work/duckdb/1.3/sql/expressions/comparison_operators.html
- Excel Extension – DuckDB 8342
- 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
...T * FROM test ; Type and Range Inference Because Excel itself only really stores numbers or strings in cells, and does not enforce that all cells in a column are of the same type, the excel extension has to do some guesswork to "infer" and decide the ty... - https://man.mtool.work/duckdb/1.3/core_extensions/excel.html
- Java JDBC Client – DuckDB 8124
- This page is for DuckDB 1.3, which is outdated. Switch to the current documentation . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Ove
...DriverManager class. The driver should auto-register in the DriverManager , if that does not work for some reason, you can enforce registration using the following statement: Class . forName ( "org.duckdb.DuckDBDriver" ); To create a DuckDB connection,... - https://man.mtool.work/duckdb/1.3/clients/java.html
- DuckDB_% Metadata Functions – DuckDB 7888
- 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
...id The internal identifier of the column data type. BIGINT character_maximum_length Always NULL . DuckDB text types do not enforce a value length restriction based on a length type parameter. INTEGER numeric_precision The number of units (in the base in... - https://man.mtool.work/duckdb/1.3/sql/meta/duckdb_table_functions.html
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