How can Oracle be set to default to the current time?

In Oracle, you can use the DEFAULT keyword to set a default value as the current time. For example, you can use DEFAULT SYSDATE when creating a table to set the default value as the current date and time. Here is an example code:

CREATE TABLE example_table (
    id NUMBER,
    created_at TIMESTAMP DEFAULT SYSDATE
);

In this example, the default value of the created_at column will be set to the current date and time. If no value is provided for the created_at column when inserting a row of data, the current date and time will automatically be used as the default value.