Required Initializergrdb 7.3.0GRDB
init
Creates an aggregate.
init() A new instance is created for each aggregation.
Creates an aggregate.
init() A new instance is created for each aggregation.
import GRDBA toolkit for SQLite databases, with a focus on application development
protocol DatabaseAggregateThe protocol for custom SQLite aggregates.
func finalize() throws -> (any DatabaseValueConvertible)? Returns the aggregated value.
mutating func step(_ dbValues: [DatabaseValue]) throws Updates the aggregated value for one step of the aggregation.