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UPDATE

Update rows in a table.

note

Dremio supports reading positional deletes and equality deletes for Apache Iceberg v2 tables. Dremio does not support reading global equality deletes from Apache Iceberg v2 tables in which the partition spec for the delete file is unpartitioned. Dremio performs writes using copy-on-write. Dremio does not support writes using merge-on-read.

Syntax
UPDATE <table_name>
  [ AT { REF[ERENCE] | BRANCH } <reference_name> ]
  [ AS <alias> ]
  SET <column1_name1> = <value1> [, <column_name2> = <value2> ... ]
  [ WHERE where_conditions ]

Parameters​

<table_name> String

The name of the source that you want to update a table in.

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

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

REF: Identifies the specific reference.

BRANCH: Identifies the specific branch.

note

If AT BRANCH is specified, it will override the session context for the entire query including the SELECT portions.

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.

SET <column1_name> = <value1> [, <column2_name> = <value2> ... ] String

Sets the value of one or more columns. The value can be any expression or sub-query that returns a single value.

WHERE where_conditions String   Optional

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

Example​

Specify the source table when specifying the target table
UPDATE MYSOURCE.MYTABLE AT BRANCH main
  SET EXPR$0 = s.EXPR$1
  FROM MYSOURCE.MYTABLE2 AT BRANCH main
  AS s