Unsupported Syntax or Features - Teradata Database

Unsupported Syntax

Explanation

INSERT … SELECT

None.

Positioned UPDATE

A WHERE clause cannot use an updatable cursor to do a positioned UPDATE.

UPDATE … FROM

None.

UPDATE … WHERE subquery

A WHERE clause cannot use a subquery either to specify the primary index or to constrain a non-index column.

UPDATE … SET … primary_index_column

You cannot update a primary index column because any change to the rowhash value for a row affects its distribution.

UPDATE … SET … partitioning_column

You cannot update a partitioning column because any change to the partitioning for a row affects its location.

UPDATE … SET identity_column …

You cannot update GENERATED ALWAYS identity column values.

UPDATE … SET PARTITION …

You cannot update system‑derived PARTITION values.

If PARTITION is a user‑named column in a table, and not a GENERATED ALWAYS identity column, then it can be updated.