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I am trying to create a python toolbox with the following function: I want to select points or lines within a polygon and save the selected feautres as a temporarily Feature. (That works)

Then I want to use SQL-Queries for example to count all Features of the Point-Feature-Class or the total length of a Line-Feature-Class. The result of the queries should be written into an existing Table. For example the result of the total length of a Line-Feature-Class, should be written into the Field: TOTAL_LENGTH.

At the end, the Table should be exported as an excel-file (Should be no problem)

I don't want to get the complete finished code. Just an Idea how to do the query and saving the result into a different existing table.

Does somebody has an idea?

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I think Richard is right about Summary Statistics being your best bet, but if for some reason you don't want to do that:

1: Select by location (you say this already works)

2: For point feature class:

    count = int(str(arcpy.GetCount_management))

2: For line feature class:

    total_len = 0
    for row in arcpy.da.SearchCursor(line_fc, "SHAPE_Length"):
        total_len+=row[0]

3:

    with arcpy.da.InsertCursor(output_fc, "StatField") as inserter:
        #StatField will be count or length dep on point or line fc
        inserter.insertRow([count]) #Or total_len if line fc

4: TableToExcel_conversion tool

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