Joining CSV tables by multiple attributes

How do I combine attribute tables?

Joining attributes in one table to another

1. In the table of contents, right-click the layer or table you want to join, point to Joins and Relates, then click Join.
2. Click the What do you want to join to this layer?
3. Click the field on which the join will be based.
4. Choose the table to join to the layer or table.

How do I merge a CSV file to an attribute table in ArcGIS?

The Add Join (Data Management) tool joins a layer table to another layer table based on a similar field.

1. Open the ArcGIS Pro project.
2. In the Contents pane, right-click the feature layer and click Attribute Table to display the layer data.
3. Right-click the CSV standalone table and click Open to display the census data.

How do I join data in Qgis?

Joining Data

1. Open the layer properties (double-click the layer) and click on the Joins tab in the left column.
2. Click the green Addition symbol at the bottom of the dialog box.
3. Change the Join layer to the standalone table and change the join and target fields to the fields that have a common geographic identifier.