UNIQUE

drizzle_postgres::attrs

Constant UNIQUE 

Source 
pub const UNIQUE: ColumnMarker;
Expand description

Adds a UNIQUE constraint to this column.

§Example

ⓘ
#[column(UNIQUE)]
email: String,

See: https://www.postgresql.org/docs/current/ddl-constraints.html#DDL-CONSTRAINTS-UNIQUE-CONSTRAINTS