Oracle Columns of any data type can contain NULLs

SELECT 1 NUM_COLUMN, 'foo' VARCHAR2_COLUMN FROM DUAL
UNION ALL
SELECT NULL, NULL FROM DUAL;

NUM_COLUMN VARCHAR2_COLUMN

1 foo

(null) (null)

Empty strings are NULL

SELECT 1 a, '' b FROM DUAL;

A B

1 (null)

Conclusion

In this page (written and validated by A. Gawali) you learned about Oracle Columns of any data type can contain NULLs . What's Next? If you are interested in completing Oracle tutorial, your next topic will be learning about: Oracle String Manipulation.

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