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- ALTER TABLE Statement 14739
- The ALTER TABLE statement changes the schema of an existing table in the catalog. Examples CREATE TABLE integers (i INTEGER, j INTEGER); Add a new column with name k to the table integers , it will be filled with the default value NULL : AL
...TER TABLE integers ADD COLUMN k INTEGER; Add a new column with name l to the table integers, it will be filled with the default value 10: ALTER TABLE integers ADD COLUMN l INTEGER DEFAULT 10; Drop the column k from the table integers...mn of a table, use the ADD or ADD COLUMN clauses. E.g., to add a new column with name k to the table integers , it will be filled with the default value NULL : ALTER TABLE integers ADD COLUMN k INTEGER; Or: ALTER TABLE integers ADD k INTEGER; Add a new...column with name l to the table integers, it will be filled with the default value 10: ALTER TABLE integers ADD COLUMN l INTEGER DEFAULT 10; The ADD [COLUMN] clause can be used to ad... - https://man.mtool.work/duckdb/2.0/sql/statements/alter_table.html
- CSV Import Tips 9067
- Below is a collection of tips to help when attempting to import complex CSV files. In the examples, we use the flights.csv file. Override the Header Flag if the Header Is Not Correctly Detected If a file contains only string columns the hea
...fy 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 existing table where the table has... - https://man.mtool.work/duckdb/2.0/data/csv/tips.html
- INSERT Statement 9067
- The INSERT statement inserts new data into a table. Examples Insert the values 1, 2, 3 into tbl : INSERT INTO tbl VALUES (1), (2), (3); Insert the result of a query into a table: INSERT INTO tbl SELECT * FROM other_tbl; Insert values into t
...n either be BY POSITION (the default) or BY NAME . Each column not present in the explicit or implicit column list will be filled with a default value, either its declared default value or NULL if there is none. If the expression for any column is not...misspelled or does not exist in the table, an error will occur. Columns that are missing from the 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... - https://man.mtool.work/duckdb/2.0/sql/statements/insert.html
- Appender 8472
- Appenders are the most efficient way of loading data into DuckDB from within the C interface, and are recommended for fast data loading. The appender is much faster than using prepared statements or individual INSERT INTO statements. Append
...us data. The active column list specifies all columns that are expected when flushing the data. Any non-active columns are filled with their default values, or NULL. Syntax duckdb_state duckdb_appender_add_column ( duckdb_appender appender , const char...duckdb_state duckdb_append_value ( duckdb_appender appender , duckdb_value value ); duckdb_append_data_chunk Appends a pre-filled data chunk to the specified appender. Attempts casting, if the data chunk types do not match the active appender types. Sy... - https://man.mtool.work/duckdb/2.0/clients/c/appender.html
- Configuration 8472
- Configuration options can be provided to change different settings of the database system. Note that many of these settings can be changed later on using PRAGMA statements as well. The configuration object should be created, filled with val
... - https://man.mtool.work/duckdb/2.0/clients/c/config.html
- Parquet Tips 8472
- Below is a collection of tips to help when dealing with Parquet files. Tips for Reading Parquet Files Use union_by_name When Loading Files with Different Schemas The union_by_name option can be used to unify the schema of files that have di
...fferent or missing columns. For files that do not have certain columns, NULL values are filled in: SELECT * FROM read_parquet('flights*.parquet', union_by_name = true); Tips for Writing Parquet Files Using a glob patt... - https://man.mtool.work/duckdb/2.0/data/parquet/tips.html
- Prepared Statements 8472
- DuckDB supports prepared statements where parameters are substituted when the query is executed. This can improve readability and is useful for preventing SQL injections . Syntax There are three syntaxes for denoting parameters in prepared
...es to named parameters only. Auto-incremented ( ? ) and positional ( $1 ) parameters are matched by position and are never filled from a session variable, even one whose name is a number such as 1 . Dropping Prepared Statements: DEALLOCATE To drop a pr... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/prepared_statements.html
- Set Operations 8472
- Set operations allow queries to be combined according to set operation semantics . Set operations refer to the UNION [ALL] , INTERSECT [ALL] and EXCEPT [ALL] clauses. The vanilla variants use set semantics, i.e., they eliminate duplicates,
...oes not require both queries to have the same number of columns. Any columns that are only found in one of the queries are filled with NULL values for the other query. Take the following tables for example: CREATE TABLE capitals (city VARCHAR, country... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/setops.html
- SET VARIABLE and RESET VARIABLE Statements 8472
- DuckDB supports the definition of SQL-level variables using the SET VARIABLE and RESET VARIABLE statements. Variable Scopes DuckDB supports two levels of variable scopes: Scope Description SESSION Variables with a SESSION scope are local to
...e not provided for the following parameters: undefined_var This is because $name is a prepared statement parameter that is filled from the session variable of the same name. This also lets variables act as default values for prepared statements . Synta... - https://man.mtool.work/duckdb/2.0/sql/statements/set_variable.html
- Data Chunks 8174
- Data chunks represent a horizontal slice of a table. They hold a number of vectors , that can each hold up to the VECTOR_SIZE rows. The vector size can be obtained through the duckdb_vector_size function and is configurable, but is usually
...d individual values. Writing Data : Data chunks can be created using duckdb_create_data_chunk . The data chunk can then be filled with values and used in duckdb_append_data_chunk to write data to the database. The primary manner of interfacing with dat... - https://man.mtool.work/duckdb/2.0/clients/c/data_chunk.html
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