# ColumnIndexOptions.expression property · @imqueue/pg-sequelize

Source: https://imqueue.org/api/pg-sequelize/latest/pg-sequelize.columnindexoptions.expression/
Published: 2026-08-01
Author: @imqueue maintainers (https://github.com/imqueue)
Package: @imqueue/pg-sequelize 4.2.0 — generated reference, not hand-written

Indexes this SQL expression rather than the column.

**Signature:**

```typescript
expression: string;
```

## Remarks

For filtering on a computed value — `lower("email")` being the standard case, which nothing but an expression index can serve. Raw SQL, and it replaces the column as the key rather than joining it.