问题
Is there ANY difference between those two statements?:
INSERT INTO distributors (did, dname) VALUES (DEFAULT, 'XYZ Widgets');
and:
INSERT INTO distributors (dname) VALUES ('XYZ Widgets');
I mean is there at least one reason to use one or another pattern in some particular situation or is it completely the same? did is a serial column.
回答1:
It's exactly the same thing. No need to pick one instead of the other.
Usually default keyword is handy when you have computer-generated code. It makes life easier to just use every single column in the insert clause and just use default when you don't have a specific value for certain column.
Other than that, as I said, it's the same.
回答2:
INSERT INTO distributors (dname) VALUES ('XYZ Widgets');
This is fine, you do not need to specify a field if you want its default value being saved, provided a default is set.
来源：https://stackoverflow.com/questions/14602992/insert-default-values