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- CREATE TABLE Statement – DuckDB 12561
- This page is for DuckDB 1.3, which is outdated.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
...; INSERT INTO t3 VALUES ( 1 , 5 , 10 ); INSERT INTO t3 VALUES ( 2 , 5 , 3 ); Constraint Error: CHECK constraint failed: t3 Foreign Key Constraints A FOREIGN KEY is a column (or set of columns) that references another table's primary key. Foreign keys ch...ertion. CREATE TABLE t1 ( id INTEGER PRIMARY KEY , j VARCHAR ); CREATE TABLE t2 ( id INTEGER PRIMARY KEY , t1_id INTEGER , FOREIGN KEY ( t1_id ) REFERENCES t1 ( id ) ); Example: INSERT INTO t1 VALUES ( 1 , 'a' ); INSERT INTO t2 VALUES ( 1 , 1 ); INSERT...INTO t2 VALUES ( 2 , 2 ); Constraint Error: Violates foreign key constraint because key "id: 2" does not exist in the referenced table Foreign keys can be defined on composite primary... - https://man.mtool.work/duckdb/1.3/sql/statements/create_table.html
- Information Schema – DuckDB 10519
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...the check expression. For a not-null constraint, this view identifies the column that the constraint is defined on. For a foreign key constraint, this view identifies the columns that the foreign key references. For a unique or primary key constraint,...rdinal position of the column within the constraint key (count starts at 1). INTEGER 1 position_in_unique_constraint For a foreign-key constraint, ordinal position of the referenced column within its unique constraint (count starts at 1 ); otherwise NUL...tudents_id_fkey unique_constraint_catalog Name of the database that contains the unique or primary key constraint that the foreign key constraint references. VARCHAR 'my_db' unique_constraint_schema Name of the schema that contains the unique or primary... - https://man.mtool.work/duckdb/1.3/sql/meta/information_schema.html
- Indexes – DuckDB 10374
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.... statements, or potentially make use of DuckDB's Appender (if available in the client). Over-Eager Constraint Checking in Foreign Keys This limitation occurs if you meet the following conditions: A table has a FOREIGN KEY constraint. There is an UPDATE...ponding PRIMARY KEY table, which DuckDB rewrites into a DELETE followed by an INSERT . The to-be-deleted row exists in the foreign key table. If these hold, you'll encounter an unexpected constraint violation: CREATE TABLE pk_table ( id INTEGER PRIMARY...)); INSERT INTO fk_table VALUES ( 1 ); UPDATE pk_table SET payload = [ 'world' ] WHERE id = 1 ; Constraint Error: Violates foreign key constraint because key "id: 1" is still referenced by a foreign key in a different table. If this is an unexpected con... - https://man.mtool.work/duckdb/1.3/sql/indexes.html
- Constraints – DuckDB 8748
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...errors such as violates primary key constraint and violates unique constraint . See the indexes section for more details . Foreign Keys Foreign keys define a column, or set of columns, that refer to a primary key or unique constraint from another table....1' ); INSERT INTO exams VALUES ( 1 , 1 , 1 , 10 ); INSERT INTO exams VALUES ( 2 , 1 , 2 , 10 ); Constraint Error: Violates foreign key constraint because key "id: 2" does not exist in the referenced table In order to enforce this property efficiently, a...n ART index is automatically created for every foreign key constraint that is defined in the table. Warning Indexes have certain limitations that might result in constraints bei... - https://man.mtool.work/duckdb/1.3/sql/constraints.html
- Indexing – DuckDB 7898
- 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
...g Adaptive Radix Tree (ART) 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 co...slowdowns when opening 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...index, do so after bulk loading the data to the table. Adding an index prior to loading, either explicitly or via primary/foreign keys, is detrimental to load performance . 関連キーワード index column indexes DuckDB scan scans memory columns these Inde... - https://man.mtool.work/duckdb/1.3/guides/performance/indexing.html
- DuckDB_% Metadata Functions – DuckDB 7681
- 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
...it appears in its table definition. BIGINT constraint_type Indicates the type of constraint. Applicable values are CHECK , FOREIGN KEY , PRIMARY KEY , NOT NULL , UNIQUE . VARCHAR constraint_text The definition of the constraint expressed as a SQL-phrase...provides metadata about secondary indexes, i.e., those indexes created by explicit CREATE INDEX statements. Primary keys, foreign keys, and UNIQUE constraints are maintained using indexes, but their details are included in the duckdb_constraints() func...ies. Column Description Type context_id The identifier of the context. The context_id column in the duckdb_logs table is a foreign key that points to this column. UBIGINT scope The scope of the context ( connection , database or file_opener TODO: + more... - https://man.mtool.work/duckdb/1.3/sql/meta/duckdb_table_functions.html
- FROM and JOIN Clauses – DuckDB 7338
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...key INTEGER NOT NULL PRIMARY KEY , n_name CHAR ( 25 ) NOT NULL , n_regionkey INTEGER NOT NULL , n_comment VARCHAR ( 152 ), FOREIGN KEY ( n_regionkey ) REFERENCES l_regions ( r_regionkey ) ); Return the regions for the nations: SELECT n . * , r . * FROM...nationkey INTEGER NOT NULL PRIMARY KEY , name CHAR ( 25 ) NOT NULL , regionkey INTEGER NOT NULL , comment VARCHAR ( 152 ), FOREIGN KEY ( regionkey ) REFERENCES l_regions ( regionkey )); Return the regions for the nations: SELECT n . * , r . * FROM l_nat... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/from.html
- Schema – DuckDB 7121
- 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
...o 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 for ensuring data integrity but they have a negative effect on load performance... - https://man.mtool.work/duckdb/1.3/guides/performance/schema.html
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