Use Field calculations In ArcMap)

I have never discovered the role of this stuff before, so that I have done a lot of useless work (I believe that I have the same feeling). Today, I suddenly found that it still has such a skill. It is really embarrassing! Let's take a look ~~

The field calculator can be used to calculate the values of one or more fields or all records in the element-Class Attribute Table. The field calculator is a good tool for copying, connecting, and creating new field values. There are two modes: simple mode and advanced mode. In simple mode, the field calculator can be used to copy Field Values, connect strings, perform most mathematical calculations, and input raw data. In advanced mode, the field calculator can perform condition-based reclassification, perform complex mathematical calculations, and extract geometric and geographic information. You can use the field calculator whether or not to enable the edit session. Any field calculation in the editing session can be undone. The field calculation outside the editing session is fast, but cannot be undone. Of course, fields can be computed again. The general processing principle is: if the calculation is performed on an existing data field, it should be performed in the editing session; if the new blank field is assigned a value, this can be performed outside the editing session. For element classes that participate in the topology or geometric network in Geodatabase, computing can only be performed within the editing session.

For example, you can use the field calculator to copy the value of a field to another field. This function is very useful when renaming a field. First, open an Attribute Table In ArcMap, right-click the field name, select field calculate in the pop-up menu to open the field calculator, enter newname = [name] In the expression box, and click OK, check whether all values in the name column have been copied to the newname field. You have to input them one by one!
Try other functions on your own!