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- Constraints – DuckDB 12117
- This page is for DuckDB 1.3, which is outdated.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
...name VARCHAR NOT NULL ); INSERT INTO students VALUES ( NULL ); Constraint Error: NOT NULL constraint failed: students.name Primary Key and Unique Constraint Primary key or unique constraints define a column, or set of columns, that are a unique identifi...n a table, i.e., that at most one row contains the given values for the set of columns. CREATE TABLE students ( id INTEGER PRIMARY KEY , name VARCHAR ); INSERT INTO students VALUES ( 1 , 'Student 1' ); INSERT INTO students VALUES ( 1 , 'Student 2' ); Co...nstraint Error: Duplicate key "id: 1" violates primary key constraint CREATE TABLE students ( id INTEGER , name VARCHAR , PRIMARY KEY ( id , name )); INSERT INTO students VALUES... - https://man.mtool.work/duckdb/1.3/sql/constraints.html
- Client Overview – DuckDB 11637
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...client APIs (also known as “drivers”) for several languages. Client API Maintainer Support tier Version C The DuckDB team Primary 1.5.6 Command Line Interface (CLI) The DuckDB team Primary 1.5.6 Java (JDBC) The DuckDB team Primary 1.5.6 Go Marc Boeker...and the DuckDB team Primary 1.5.6 Node.js (node-neo) Jeff Raymakers ( MotherDuck ) Primary 1.5.6 ODBC The DuckDB team Primary 1.5.6 Python The DuckDB...team Primary 1.5.6 R Kirill Müller and the DuckDB team Primary 1.5.6 Rust The DuckDB team Primary 1.5.6 WebAssembly (Wasm) The DuckDB t... - https://man.mtool.work/duckdb/1.3/clients/overview.html
- INSERT Statement – DuckDB 11489
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...licitly insert the default value into a column: INSERT INTO tbl ( i ) VALUES ( 1 ), ( DEFAULT ), ( 3 ); Assuming tbl has a primary key/unique constraint, do nothing on conflict: INSERT OR IGNORE INTO tbl ( i ) VALUES ( 1 ); Or update the table with the...e. 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 following example: CREATE TABLE tbl ( i INTEGER PRIMARY KE...ES ( 1 , 42 ); INSERT INTO tbl VALUES ( 1 , 84 ); This raises as an error: Constraint Error: Duplicate key "i: 1" violates primary key constraint. The table will contain the row that was first inserted: SELECT * FROM tbl ; i j 1 42 These error messages... - https://man.mtool.work/duckdb/1.3/sql/statements/insert.html
- Schema – DuckDB 11307
- 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
...ly 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 for ensuring data integrity but they have a negative effect on...tails). 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 primary keys with the LDBC Comment table at scale factor 300 . This table has appro...x. 554 million entries. In the first experiments, we create the schema without a primary key, then load the data. In the second experiment, we create the schema with a primary key, then load the data. In the thi... - https://man.mtool.work/duckdb/1.3/guides/performance/schema.html
- CREATE TABLE Statement – DuckDB 10811
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...ples Create a table with two integer columns ( i and j ): CREATE TABLE t1 ( i INTEGER , j INTEGER ); Create a table with a primary key: CREATE TABLE t1 ( id INTEGER PRIMARY KEY , j VARCHAR ); Create a table with a composite primary 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 , decim...ATA ; Or: CREATE TABLE t1 AS FROM t2 LIMIT 0 ; It is not possible to create tables using CTAS statements with constraints (primary keys, check constraints, etc.). Check Constraints A CHECK constraint is an expression that must be satisfied by the values... - https://man.mtool.work/duckdb/1.3/sql/statements/create_table.html
- ALTER TABLE Statement – DuckDB 9092
- 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
...ble: ALTER TABLE integers RENAME TO integers_old ; Rename a column of a table: ALTER TABLE integers RENAME i TO ii ; Add a primary key to a column of a table: ALTER TABLE integers ADD PRIMARY KEY ( i ); Syntax ALTER TABLE changes the schema of an existi...umns can only be removed if they do not have any indexes that rely on them. This 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...rst need to drop the index, alter the table, and then recreate the index. Otherwise, you will get a Dependency Error . ADD PRIMARY KEY Add a primary key to a column of a table: ALTER TABLE integers ADD PRIMARY KEY ( i ); Add a primary key to multiple co... - https://man.mtool.work/duckdb/1.3/sql/statements/alter_table.html
- Indexes – DuckDB 8744
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...olumns of all 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 manuall...y using CREATE INDEX clause and they are automatically created for columns with a UNIQUE or PRIMARY KEY constraint. Warning ART indexes must currently be able to fit in memory during index creation. Avoid creating ART inde...That is because we have not yet seen that chunk. Thus, we throw a constraint violation. CREATE TABLE my_table ( i INTEGER PRIMARY KEY ); INSERT INTO my_table SELECT range FROM range ( 3_000 ); UPDATE my_table SET i = i + 1 ; Constraint Error: Duplicate... - https://man.mtool.work/duckdb/1.3/sql/indexes.html
- Information Schema – DuckDB 7934
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...efined on. For a foreign key constraint, this view identifies the columns that the foreign key references. For a unique or primary key constraint, this view identifies the constrained columns. Column Description Type Example table_catalog Name of the da...he constraint. VARCHAR exam_id_students_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 tha...t contains the unique or primary key constraint that the foreign key constraint references. VARCHAR 'main' unique_constraint_name Name of the unique or pri... - https://man.mtool.work/duckdb/1.3/sql/meta/information_schema.html
- DuckDB_% Metadata Functions – DuckDB 7835
- 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
...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. (Not necessa...s. MAP(VARCHAR, VARCHAR) is_unique true if the index was created with the UNIQUE modifier, false if it was not. BOOLEAN is_primary Always false . BOOLEAN expressions Always NULL . VARCHAR sql The definition of the index, expressed as a CREATE INDEX SQL...b_indexes only 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_cons... - https://man.mtool.work/duckdb/1.3/sql/meta/duckdb_table_functions.html
- Indexing – DuckDB 7637
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...allows defining 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...not cause any 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 ex...e an ART 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 th... - https://man.mtool.work/duckdb/1.3/guides/performance/indexing.html
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