Will data be lost in a Custom Field if Data Type is changed to Number from any other Data Type?

A.

The answer is "it depends" because it is based on the previous data type of the custom field and the type of data that was stored in it.

When changing the data type of a custom field in Salesforce, you should always be aware of the potential impact on the data stored in the field. For example, changing a custom field from a text data type to a number data type can lead to data loss if the existing data in the field includes non-numeric characters, such as letters or symbols.

If the custom field previously stored numeric data, then changing the data type to a number data type is less likely to result in data loss. However, if the data type is changed from a number with decimal places to a number without decimal places, then the decimal portion of the existing data will be truncated.

It is important to note that Salesforce does provide a warning message when changing a data type, specifically indicating whether or not data loss may occur. It is always a good practice to review this warning message carefully before proceeding with any changes to the data type of a custom field.

In summary, the answer to the question is "it depends" on the specific data type of the custom field and the data stored within it. However, it is always important to review the warning message provided by Salesforce before making any changes to a custom field's data type.