Report Builder Functions - Union Function

Returns the union of all the non-null numeric values specified by the expression, evaluated in the given scope.


You can create and modify paginated report definition (.rdl) files in Report Builder and in Report Designer in SQL Server Data Tools. Each authoring environment provides different ways to create, open, and save reports and related items.


Union(expression, scope, recursive)  


(SqlGeometry or SqlGeography) The expression on which to perform the aggregation.

(String) Optional. The name of a dataset, group, or data region that contains the report items to which to apply the aggregate function. If scope is not specified, the current scope is used.

(Enumerated Type) Optional. Simple (default) or RdlRecursive. Specifies whether to perform the aggregation recursively.


Returns a spatial object, either SqlGeometry or SqlGeography, based on the expression type. For more information about SqlGeometry and SqlGeography spatial data types, see Spatial Data Types Overview.


The set of data specified in the expression must have the same data type.

The value of scope must be a string constant and cannot be an expression. For outer aggregates or aggregates that do not specify other aggregates, scope must refer to the current scope or a containing scope. Dataset scopes are not supported. For aggregates of aggregates, nested aggregates can specify a child scope.

Expression can contain calls to nested aggregate functions with the following exceptions and conditions:


The following table shows examples of SqlGeometry expressions and Union result expression, shown in WKT (Well Known Text) format for spatial data.

Field with spatial data Example Union result
[PointLocation] POINT(1 2)

POINT(3 4)
MULTIPOINT((1 2), (3 4))
[PathDefinition] LINESTRING(1 2, 3 4)

LINESTRING(5 6, 7 8)
MULTILINESTRING((7 8, 5 6), (3 4, 1 2))
[PolygonDefinition] POLYGON((1 2, 3 4, 5 2, 1 2))

POLYGON((-1 2, -3 4, -5 2, -1 2))
MULTIPOLYGON(((1 2, 5 2, 3 4, 1 2)), ((-5 2, -1 2, -3 4, -5 2)))
=Union(Fields!PolygonDefinition.Value, "Group1")  

See Also

Expression Uses in Reports (Report Builder and SSRS)
Expression Examples (Report Builder and SSRS)
Data Types in Expressions (Report Builder and SSRS)
Expression Scope for Totals, Aggregates, and Built-in Collections (Report Builder and SSRS)