Results of 1 - 10 of about 370 for Constraints (0.018 sec.)
- Constraints – DuckDB 15215
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...s Time Functions Timestamp Functions Timestamp with Time Zone Functions Union Functions Utility Functions Window Functions Constraints Indexes Meta Queries Information Schema Metadata Functions DuckDB's SQL Dialect Overview Indexing Friendly SQL Keywords an...Internals Overview Storage Versions and Format Execution Format Pivot Sitemap 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 table as part of the CREATE TABLE statement . In certain cases, constraints... - https://man.mtool.work/duckdb/1.3/sql/constraints.html
- CREATE TABLE Statement – DuckDB 10951
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...s Time Functions Timestamp Functions Timestamp with Time Zone Functions Union Functions Utility Functions Window Functions Constraints Indexes Meta Queries Information Schema Metadata Functions DuckDB's SQL Dialect Overview Indexing Friendly SQL Keywords an...y key: CREATE TABLE t1 ( id INTEGER , j VARCHAR , PRIMARY KEY ( id , j )); Create a table with various different types and constraints: CREATE TABLE t1 ( i INTEGER NOT NULL , decimalnr DOUBLE CHECK ( decimalnr < 10 ), date DATE UNIQUE , time TIMESTAMP ); Cr...t1 AS FROM t2 LIMIT 0 ; Note that only the column names and types are copied to t2 , other pieces of information (indexes, constraints, default values, etc.) are not copied. Temporary Tables Temporary tables can be created using the CREATE TEMP TABLE or the... - https://man.mtool.work/duckdb/1.3/sql/statements/create_table.html
- DuckDB_% Metadata Functions – DuckDB 10713
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...s Time Functions Timestamp Functions Timestamp with Time Zone Functions Union Functions Utility Functions Window Functions Constraints Indexes Meta Queries Information Schema Metadata Functions DuckDB's SQL Dialect Overview Indexing Friendly SQL Keywords an...uckDB internal objects. (In fact, information_schema.columns is implemented as a query on top of duckdb_columns() ) duckdb_constraints The duckdb_constraints() function provides metadata about the constraints available in the DuckDB instance. Column Descrip...AR referenced_column_names The column names references the by the constraint. VARCHAR[] The information_schema.referential_constraints and information_schema.table_constraints system views provide a more standardized way to obtain metadata about constraints... - https://man.mtool.work/duckdb/1.3/sql/meta/duckdb_table_functions.html
- Schema – DuckDB 9762
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...s Time Functions Timestamp Functions Timestamp with Time Zone Functions Union Functions Utility Functions Window Functions Constraints Indexes Meta Queries Information Schema Metadata Functions DuckDB's SQL Dialect Overview Indexing Friendly SQL Keywords an...tpractice Avoid representing numeric values as strings, especially if you intend to perform e.g., join operations on them. Constraints DuckDB allows defining constraints such as UNIQUE , PRIMARY KEY , and FOREIGN KEY . These constraints can be beneficial fo...s not rely on these indexes for join and aggregation operators (see indexing for more details). Bestpractice Do not define constraints unless your goal is to ensure data integrity. Microbenchmark: The Effect of Primary Keys We illustrate the effect of using... - https://man.mtool.work/duckdb/1.3/guides/performance/schema.html
- Information Schema – DuckDB 8819
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...s Time Functions Timestamp Functions Timestamp with Time Zone Functions Union Functions Utility Functions Window Functions Constraints Indexes Meta Queries Information Schema Metadata Functions DuckDB's SQL Dialect Overview Indexing Friendly SQL Keywords an...osition of the referenced column within its unique constraint (count starts at 1 ); otherwise NULL . INTEGER 1 referential_constraints : Referential Constraints Column Description Type Example constraint_catalog Name of the database containing the constrain...is_typed YES if the table is a typed table, NO if not. VARCHAR 'NO' commit_action Not yet implemented. VARCHAR 'NO' table_constraints : Table Constraints Column Description Type Example constraint_catalog Name of the database that contains the constraint (... - https://man.mtool.work/duckdb/1.3/sql/meta/information_schema.html
- ALTER TABLE Statement – DuckDB 7277
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...s Time Functions Timestamp Functions Timestamp with Time Zone Functions Union Functions Utility Functions Window Functions Constraints Indexes Meta Queries Information Schema Metadata Functions DuckDB's SQL Dialect Overview Indexing Friendly SQL Keywords an...OLUMN i TO j ; ALTER TABLE integers RENAME i TO j ; The RENAME [COLUMN] clause renames a single column within a table. Any constraints that rely on this name (e.g., CHECK constraints) are automatically updated. However, note that any views that rely on this...is includes any indexes created as part of a PRIMARY KEY or UNIQUE constraint. Columns that are part of multi-column check constraints cannot be dropped either. If you attempt to drop a column with an index on it, DuckDB will return the following error mess... - https://man.mtool.work/duckdb/1.3/sql/statements/alter_table.html
- Indexing – DuckDB 6916
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...s Time Functions Timestamp Functions Timestamp with Time Zone Functions Union Functions Utility Functions Window Functions Constraints Indexes Meta Queries Information Schema Metadata Functions DuckDB's SQL Dialect Overview Indexing Friendly SQL Keywords an...T) indexes in two ways. First, such an index is created implicitly for columns with PRIMARY KEY , FOREIGN KEY , and UNIQUE constraints . Second, explicitly running the CREATE INDEX statement creates an ART index on the target column(s). The tradeoffs of hav...an existing database. Bestpractice We recommend following these guidelines: Only use primary keys, foreign keys, or unique constraints, if these are necessary for enforcing constraints on your data. Do not define explicit indexes unless you have highly sele... - https://man.mtool.work/duckdb/1.3/guides/performance/indexing.html
- DuckDB Environment – DuckDB 6801
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...s Time Functions Timestamp Functions Timestamp with Time Zone Functions Union Functions Utility Functions Window Functions Constraints Indexes Meta Queries Information Schema Metadata Functions DuckDB's SQL Dialect Overview Indexing Friendly SQL Keywords an...e following built-in table functions to obtain metadata about available catalog objects: duckdb_columns() : columns duckdb_constraints() : constraints duckdb_databases() : lists the databases that are accessible from within the current DuckDB process duckdb...rm extensions functions running architecture Meta number retrieve information instance following available objects columns constraints databases dependencies indexes keywords schemas sequences settings tables 関連するページ Extensions Extension Distribution... - https://man.mtool.work/duckdb/1.3/guides/meta/duckdb_environment.html
- Indexes – DuckDB 5612
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...s Time Functions Timestamp Functions Timestamp with Time Zone Functions Union Functions Utility Functions Window Functions Constraints Indexes Meta Queries Information Schema Metadata Functions DuckDB's SQL Dialect Overview Indexing Friendly SQL Keywords an...l general-purpose data types . Adaptive Radix Tree (ART) An Adaptive Radix Tree (ART) is mainly used to ensure primary key constraints and to speed up point and very highly selective (i.e., < 0.1%) queries. ART indexes can be created manually using CREATE I...ey value as part of the UPDATE rewrite. 関連キーワード table index indexes constraint DuckDB range columns foreign Indexes Constraint statements followed also created statement rewrite rows limitation because violation Index types automatically Adaptive Rad... - https://man.mtool.work/duckdb/1.3/sql/indexes.html
- Friendly SQL – DuckDB 5383
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...s Time Functions Timestamp Functions Timestamp with Time Zone Functions Union Functions Utility Functions Window Functions Constraints Indexes Meta Queries Information Schema Metadata Functions DuckDB's SQL Dialect Overview Indexing Friendly SQL Keywords an...ad of positions. INSERT OR IGNORE INTO ... : insert the rows that do not result in a conflict due to UNIQUE or PRIMARY KEY constraints. INSERT OR REPLACE INTO ... : insert the rows that do not result in a conflict due to UNIQUE or PRIMARY KEY constraints. F... - https://man.mtool.work/duckdb/1.3/sql/dialect/friendly_sql.html
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