# Build an index or constraint

Control / ddl

A variant of [Create or change tables](https://meridian.online/operations/create-or-change-tables).

Create or drop an index or a constraint on a table's columns or a graph's properties.

Page: <https://meridian.online/operations/create-or-change-tables/build-an-index-or-constraint>

## Status

Not built yet.

arcform does not do this yet. [Its place on the roadmap](https://meridian.online/roadmap#create-or-change-tables)

## What other tools call it

Meridian's classification; an independent blind rating agreed on 95.7% of 324 rows (variant, version 3).

- DuckDB: [`CREATE INDEX`](https://duckdb.org/docs/current/sql/statements/create_index) (read 2026-09-27)
- Apache Hop: [`Neo4j constraint`](https://hop.apache.org/manual/latest/workflow/actions/neo4j-constraint.html) (read 2026-09-27)
- Apache Hop: [`Neo4j index`](https://hop.apache.org/manual/latest/workflow/actions/neo4j-index.html) (read 2026-09-27)