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DELETE

Delete rows from a table.

note

Dremio supports reading Apache Iceberg v2 tables with positional deletes. Reading tables with equality deletes is not supported. Writes by Dremio are performed using copy-on-write. Writes using merge-on-read are not supported.

Syntax
DELETE FROM <table_name>
[ AT { REF[ERENCE] | BRANCH } <reference_name> ]
[ AS <alias> ]
[ USING <additional_table_or_query>
[ WHERE where_conditions ]

Parameters

<table_name> String

The name of the table with data that you want to delete.


AT { REF[ERENCE] | BRANCH } <reference_name> String   Optional

Specifies the reference at which you want the table to be deleted from. When this parameter is omitted, the current branch is used.

REF: Identifies the specific reference.

BRANCH: Identifies the specific branch.

note

If you specify the reference for the target table, you must also specify the reference for the source table.


AS <alias> String   Optional

The alias of the table.


<additional_table_or_subquery>String   Optional

If you need to refer to additional tables or subqueries in the WHERE clause to help identify the rows to be removed, then specify those table names in the USING clause. Enclose subqueries in parentheses.

When a WHERE clause contains a JOIN between source tables in the USING clause and the target table, a row in the target table might join with more than one row in the source table. When this condition occurs, the DELETE command fails with an error message.


WHERE where_conditions String   Optional

The filter for specifying which rows of the table to delete.

note

Join conditions are not supported in WHERE clauses. If you need to use a join condition, use a correlated subquery instead.

Example of an unsupported DELETE command
DELETE FROM orders
USING returns
WHERE orders.order_id = returns.order_id;

Example

Equivalent DELETE command using a correlated subquery
DELETE FROM orders
WHERE EXISTS (select 1 from returns where order_id = orders.order_id)