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I need to merge fields in rows in the attribute table based on common values of some attributes and calculate the sum of the area associated to them. How can I do that?

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    Your question is unclear. Could you add some screenshot showing what you mean? – BERA Nov 9 '18 at 17:00
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    Is the table is in enterprise db? If so, did you try using an SQL expression with GROUP BY on your common value with SUM on the fields you want summed? I would recommend writing/debugging the sql in something like SSMS, then pasting it into the the UI or to the gp tool. desktop.arcgis.com/en/arcmap/10.3/tools/data-management-toolbox/… – Kirk Kuykendall Nov 9 '18 at 17:31
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Use the dissolve tool to merge the similar values in the attribute table. If the output is a file-geodatabase feature class then there will be a default attribute with the area total. If you output to a shapefile you can create a new attribute and use the calculate geometry tools to calculate the area.

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