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EC: Attribute table__Field calculator
Entering values with the keyboard is not the only way you can edit values in a table. In some cases, you might want to perform a mathematical calculation to set a field value for a single record or even all records. The Field Calculator lets you perform simple as well as advanced calculations on all or selected records.
Performing field calculations is an easy way to batch update many records at once in your table. The Field Calculator works on string and number and automatically calculates selected records if the layer or table has a selection set present.
1. Right-click the field heading for which you want to make a calculation and click [Field Calculator].
2. Use the Fields list and Functions to build a calculation expression. You can also edit the expression in the
text area or type a value for the field.
3. Click [OK].