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Can a required field be null?
The required rule will consider empty or null values to be invalid. The optional rule allows empty or null values to be validated with a custom rule, but only if the field specified has been set.
IS NOT NULL necessary?
Yes, as @eaolson said, you don’t need to specify NOT NULL for primary key columns, they are set automatically to NOT NULL. Primary key by definition can never be Null. A Null value represents lack of value. Even if two records have NULL in same column , the column values are not considered equal.
Does may mean optional?
May . This word means that this item is truly optional. One vendor may choose to include the item because a particular marketplace requires it or because it enhances the product, for example; another vendor may omit the same item.
Do you have to mark optional fields on forms?
While it’s not obligatory, marking the optional fields does lighten the user’s cognitive load: in the absence of that word, the user must look around and infer that the field is optional based on the other fields being marked as required. If the word optional is next to the field descriptor, that task becomes a tad easier.
Why are optional fields always better than required?
Why use optional fields is always better than required : An asterisk is obvious to you, not to everyone, believe me, there are always some who do not understand So let’s make it simple, in all cases, negations are less understandable. You and me do not like the forms that look like toilet paper.
What are the required fields on a login form?
Login forms are short and traditionally composed of two fields: the username and the password, both of which are always required. If you’re using the asterisk, the cost of marking these fields as required should be minimal, so you cannot go wrong.
Do you use an asterisk to mark required fields?
Marking Required Fields in Forms Summary: Using an asterisk to mark required fields is an easy way to improve the usability of your forms. Only marking optional fields makes it difficult for people to fill out the form.