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The DELETE
statement removes rows from the table identified by the table-name.
If the WHERE
clause is not present, all records in the table are deleted.
If a WHERE
clause is supplied, then only those rows for which the WHERE
clause results in true are deleted. Rows for which the expression is false or NULL
are retained.
Examples
Remove the rows matching the condition i = 2
from the database:
DELETE FROM tbl WHERE i = 2;
Delete all rows in the table tbl
:
DELETE FROM tbl;
USING
Clause
The USING
clause allows deleting based on the content of other tables or subqueries.
RETURNING
Clause
The RETURNING
clause allows returning the deletes values. It uses the same syntax as the SELECT
clause except the DISTINCT
modifier is not supported.
CREATE TABLE employees(name VARCHAR, age INTEGER);
INSERT INTO employees VALUES ('Kat', 32);
DELETE FROM employees RETURNING name, 2025 - age AS approx_birthyear;
name | approx_birthyear |
---|---|
Kat | 1993 |
Syntax
TheTRUNCATE
Statement
The TRUNCATE
statement removes all rows from a table, acting as an alias for DELETE FROM
without a WHERE
clause:
TRUNCATE tbl;
Limitations on Reclaiming Memory and Disk Space
Running DELETE
does not mean space is reclaimed. In general, rows are only marked as deleted. DuckDB reclaims space upon performing a CHECKPOINT
. VACUUM
currently does not reclaim space.