UPDATE VERTEX¶

UPDATE VERTEX <vid> SET <update_columns>
[WHEN <condition>] [YIELD <columns>]

Use UPDATE VERTEX to update properties on a vertex. The UPDATE VERTEX statement only updates one tag of a vertex at a time.

Nebula Graph supports compare-and-set (CAS) operation.

NOTE: WHEN and YIELD are optional.

• vid is the ID of the vertex to be updated.
• update_columns is the properties of the vertex to be updated. For example, tag1.col1 = $^.tag2.col2 + 1 means to update tag1.col1 to tag2.col2+1.

  NOTE:  $^ indicates the vertex to be updated.

• condition is some constraints. Only when the constraints are met, UPDATE is executed successfully. condition supports expression operations.
• columns is the columns to be returned. YIELD returns the latest updated values.

Consider the following example:

nebula> UPDATE VERTEX "player100" \
        SET player.age = $^.player.age + 1 \
        WHEN $^.player.name == "Tim Duncan" \
        YIELD $^.player.name AS name, $^.player.age AS age;
+--------------+-----+
| name         | age |
+--------------+-----+
| "Tim Duncan" | 43  |
+--------------+-----+