Can date type fields in Oracle be empty characters?

No, DATE type fields in Oracle do not allow null characters; it forces a valid date value, and null date values ​​will be interpreted as NULL.

Can DATE type fields in Oracle have null characters?

Answer: No

Detailed description:

DATE type fields in Oracle do not allow null characters. The DATE type enforces the storage of valid date values. Empty date values ​​are interpreted as NULL, not as empty strings.

Oracle will throw an error if you try to insert an empty string into a DATE field. For example:

<code class="sql">INSERT INTO employees (emp_id, emp_name, hire_date)
VALUES (100, 'John Doe', ''); -- 空字符串 hire_date</code>

This will result in the following error:

<code>ORA-01858: a non-null value cannot be inserted into a null column</code>

To store empty date values, NULL values ​​should be used. For example:

<code class="sql">INSERT INTO employees (emp_id, emp_name, hire_date)
VALUES (100, 'John Doe', NULL); -- NULL hire_date</code>

The above is the detailed content of Can date type fields in Oracle be empty characters?. For more information, please follow other related articles on the PHP Chinese website!