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- Constraints – DuckDB 15192
- This page is for DuckDB 1.3, which is outdated.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
...ve 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 table as par...t of the CREATE TABLE statement . In certain cases, constraints can also be added to a table using the ALTER TABLE statement , but this is not currently supported for...all constraints. Warning Constraints have a strong impact on performance: they slow down loading and updates but speed up certain queries. Please consult the Performance Guide for details. Syntax Check Constraint Check constraints allow you to specify... - https://man.mtool.work/duckdb/1.3/sql/constraints.html
- CSV Import Tips – DuckDB 11069
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...eOfFlight' , 'CarrierName' ]); Override the Types of Specific Columns The types flag can be used to override types of only certain columns by providing a struct of name → type mappings. SELECT * FROM read_csv ( 'flights.csv' , types = { 'FlightDate' : '...by_name option can be used to unify the schema of files that have different or missing columns. For files that do not have certain columns, NULL values are filled in. SELECT * FROM read_csv ( 'flights*.csv' , union_by_name = true ); To load data into an...auto header option names types table files Header detection union sample size Import Files Override Provide override used certain type Loading schema 関連するページ CSV Import CSV Auto Detection Combining Schemas Reading Multiple Files JSON Import Exce... - https://man.mtool.work/duckdb/1.3/data/csv/tips.html
- Overview – DuckDB 9962
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...ploy and operate. We believe that most users do not need to consult the pages of the operations manual. However, there are certain setups – e.g., when DuckDB is running in mission-critical infrastructure – where we would like to offer advice on how to c...ntation Operations Copy Markdown Overview designed easy deploy operate believe most users need consult pages However there certain setups running mission 関連するページ Relational API on Pandas Connect Overview Statements Overview Troubleshooting Data I... - https://man.mtool.work/duckdb/1.3/operations_manual/overview.html
- Known Issues – DuckDB 9690
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...or Linux 2 (WSL2), when querying the max_memory or memory_limit from the duckdb_settings , the values may be inaccurate on certain Ubuntu versions (e.g., 20.04 and 24.04). The issue also occurs on older distributions such as Red Hat Enterprise Linux 8 (...ntation Client APIs Copy Markdown Known Issues Incorrect Memory Values Distributions Windows Subsystem querying inaccurate certain 関連するページ Out of Memory Errors R Client UPDATE EXTENSIONS Connect Limits Known Python Issues See this page as Markdow... - https://man.mtool.work/duckdb/1.3/clients/cli/known_issues.html
- INSERT Statement – DuckDB 9401
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...g even in cases when the order of the columns in the table differs from the order of the values in the SELECT statement or certain columns are missing. For example: CREATE TABLE tbl ( a INTEGER , b INTEGER ); INSERT INTO tbl BY NAME ( SELECT 42 AS b , 3...SELECT statement will be filled with the default value. ON CONFLICT Clause An ON CONFLICT clause can be used to perform a certain action on conflicts that arise from UNIQUE or PRIMARY KEY constraints. An example for such a conflict is shown in the foll...which contains the conflicting values for the row. Optionally you can provide an additional WHERE clause that can exclude certain rows from the update. The conflicts that don't meet this condition are ignored instead. Because we need a way to refer to... - https://man.mtool.work/duckdb/1.3/sql/statements/insert.html
- sqllogictest Introduction – DuckDB 8855
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...sv_data TO '__TEST_DIR__/output_file.csv.gz' ( COMPRESSION gzip ); Require & Extensions To avoid bloating the core system, certain functionality of DuckDB is available only as an extension. Tests can be build for those extensions by adding a require fie...to a test will prevent the test from being run unless the vector size greater than or equal to 512. This is useful because certain functionality is not supported for low vector sizes, but we run tests using a vector size of 2 in our CI. 関連キーワード t... - https://man.mtool.work/duckdb/1.3/dev/sqllogictest/intro.html
- Indexes – DuckDB 8855
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...condary copy of the data in a second location – this complicates processing, particularly when combined with transactions. Certain limitations apply when it comes to modifying data that is also stored in secondary indexes. As expected, indexes have a st...rong effect on performance, slowing down loading and updates, but speeding up certain queries. Please consult the Performance Guide for details. Constraint Checking in UPDATE Statements UPDATE statements on i... - https://man.mtool.work/duckdb/1.3/sql/indexes.html
- Result Verification – DuckDB 8583
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...nged. statement error SELECT * FROM non_existent_table ; ---- Table with name non_existent_table does not exist ! Regex In certain cases result values might be very large or complex, and we might only be interested in whether or not the result contains...a snippet of text. In that case, we can use the <REGEX>: modifier followed by a certain regex. If the result value matches the regex the test is passed. This is primarily used for query plan analysis. query II... - https://man.mtool.work/duckdb/1.3/dev/sqllogictest/result_verification.html
- Pragmas – DuckDB 7748
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...y applied to the buffer manager. For most queries, the buffer manager handles the majority of the data processed. However, certain in-memory data structures such as vectors and query results are allocated outside of the buffer manager. Additionally, agg....tmp/' ; Returning Errors as JSON The errors_as_json option can be set to obtain error information in raw JSON format. For certain errors, extra information or decomposed information is provided for easier machine processing. For example: SET errors_as_... - https://man.mtool.work/duckdb/1.3/configuration/pragmas.html
- Persistent Testing – DuckDB 7748
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...g Copy Markdown Persistent Testing By default, all tests are run in in-memory mode (unless --force-storage is enabled). In certain cases, we want to force the usage of a persistent database. We can initiate a persistent database using the load command,... - https://man.mtool.work/duckdb/1.3/dev/sqllogictest/persistent_testing.html
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