Returns all aggregated strings from a field or expression joined by a delimiter.Ĭoncatenate(expression,, ,, )Ĭoncatenator - optional string to use to join values. Returns the multipart geometry of aggregated geometries from an expressionĬollect(expression,, )Įxpression - geometry expression to aggregateĬollect( $geometry ) → multipart geometry of aggregated geometriesĬollect( centroid($geometry), group_by:="region", filter:= "use" = 'civilian' ) → aggregated centroids of the civilian features based on their region value By default, the features will be returned in an unspecified order.Īrray_agg("name",group_by:="state") → list of name values, grouped by state field Order_by - optional expression to use to order features used to calculate aggregate. Group_by - optional expression to use to group aggregate calculationsįilter - optional expression to use to filter features used to calculate aggregate Returns an array of aggregated values from a field or expression.Īrray_agg(expression,, , )Įxpression - sub expression of field to aggregate By default, the features will be returned in an unspecified order.Īggregate(layer:='rail_stations',aggregate:='sum',expression:="passengers") → sum of all values from the passengers field in the rail_stations layerĪggregate('rail_stations','sum', "passengers"/7) → calculates a daily average of “passengers” by dividing the “passengers” field by 7 before summing the valuesĪggregate(layer:='rail_stations',aggregate:='sum',expression:="passengers",filter:="class">3) → sums up all values from the “passengers” field from features where the “class” attribute is greater than 3 onlyĪggregate(layer:='rail_stations',aggregate:='concatenate', expression:="name", concatenator:=',') → comma separated list of the name field for all features in the rail_stations layerĪggregate(layer:='countries', aggregate:='max', expression:="code", filter:=intersects( $geometry, ) ) → The country code of an intersecting country on the layer ‘countries’Īggregate(layer:='rail_stations',aggregate:='sum',expression:="passengers",filter:=contains( $geometry ) ) → sum of all values from the passengers field in the rail_stations within the current atlas featureĪggregate(layer:='rail_stations', aggregate:='collect', expression:=centroid($geometry), filter:="region_name" = ) → aggregates centroid geometries of the rail_stations of the same region as current feature Fields and geometry are from the features on the joined layer. Order_by - optional filter expression to order the features used for calculating the aggregate. The source feature can be accessed with the variable - optional string to use to join values for ‘concatenate’ and ‘concatenate_unique’ aggregates Valid options are:Ĭoncatenate: join strings with a concatenatorĬoncatenate_unique: join unique strings with a concatenatorĬollect: create an aggregated multipart geometryĪrray_agg: create an array of aggregated valuesĮxpression - sub expression or field name to aggregateįilter - optional filter expression to limit the features used for calculating the aggregate. Layer - a string, representing either a layer name or layer IDĪggregate - a string corresponding to the aggregate to calculate. Returns an aggregate value calculated using features from another layer.Īggregate(layer, aggregate, expression,, , ) QGIS Desktop User Guide/Manual (QGIS 3.28).
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