885b6512_Spatial_Join__Analysis___Datatype
[Parameter] Join Operation (Optional) [Explanation] The join operation describes cardinality rules associated with matching features during the join. The join options are: JOIN_ONE_TO_ONE—This means that the number of rows in the output matches the number of rows in the target feature class. If more than one feature from the join feature class matches a target feature, the attributes of those features are aggregated in the result. For example, a point within polygon join where several points are within a single polygon results in the aggregation of the points attributes. The aggregation is based on the options set in the field map control. This is the default. JOIN_ONE_TO_MANY—The means that for each row in the target features class, there can be several rows in the output feature class. With this option, attributes are never aggregated. For example, a point within polygon join where several points are within a single polygon results in a polygon for each matching point in the output feature class. [Datatype] 
String
F e a t u r e L a y e r
F e a t u r e C l a s s
S t r i n g
B o o l e a n
F i e l d M a p p i n g s
L i n e a r u n i t
Spatial Join (Analysis)