问题
In MS-SQL we can have the following constraint during table creation
create table test
(
WarningEnabled bit NOT NULL CONSTRAINT DF_WarningEnabled DEFAULT 1,
);
as we can see, i have given a name for Default constraint. IS it possible to do this in oracle
回答1:
No. Oracle does not implement a default value as a constraint so there is no way to name the constraint. You also won't be able to see the default constraint in the data dictionary views that relate to constraints (i.e. ALL_CONSTRAINTS, DBA_CONSTRAINTS, USER_CONSTRAINTS). You'd have to query the DATA_DEFAULT column from DBA_TAB_COLUMNS (or ALL_TAB_COLUMNS or USER_TAB_COLUMNS depending on your privileges and the column you're interested in).
来源：https://stackoverflow.com/questions/10300630/can-we-name-a-default-constraint-in-oracle