Available with Spatial Analyst license.
When working with attribute tables, restrictions apply to field names you can use. These restrictions include the characters used in the name, the length of the name, and the words used in the name. The restrictions may vary by format. Follow the guidelines below to avoid invalid field names.
Name restrictions based on characters
In general, start field names with a letter, not a number or a special character. To avoid problems with the English character set, limit the first character of the field name to only letters of the alphabet (a to z and A to Z). After the first letter, you can use numbers (0 to 9), underscores (_), and hyphens (-).
The following special characters (among others) are not valid:
+ * / ! ^ %
( ) [ ] { }
, ~ ' " : ;
> < & | \ =
@ # $Name restrictions based on length
The maximum length depends on the format of the table. Field names are limited to 64 characters for file geodatabases, 16 characters for INFO databases, and 10 characters for dBASE files.
For other table data formats, review the documentation for the particular format you are using to determine length restrictions.
Name restrictions based on words
The following keywords are not valid to use as a fieldname:
AND BEGIN BREAK BRK CAND COR CXOR DIFF DIV DO DOCELL EQ ELSE END ENDIF GE GT IF IN LE LT MAXOF MINOF MOD NE NOT OFF ON OR OVER THEN WHILE XOR