Follow this suggested format for naming fields in tables. These conventions are recommended, not required.
Syntax
Alias.TypeName
Arguments
Type
Notes the data type for a field in a table. Suggested prefixes for Type are as follows.
| Type | Description | Example | 
| c | Character |  | 
| d | Date |  | 
| t | Datetime |  | 
| b | Double |  | 
| f | Float |  | 
| g | General |  | 
| l | Logical |  | 
| m | Memo |  | 
| y | Currency |  | 
| n | Numeric |  | 
| I | Integer |  | 
Remarks
Prefixes aren't required, but are recommended as good programming practice. Using a prefix does not dictate the contents of a field — in Visual FoxPro, prefixes are used only as a naming convention. For example, adding the prefix "d" does not check that the contents of a field is a date, but it does help you remember the data type contained in the field.
For more information, see Visual FoxPro Naming Rules.