EMPTY_CLOB return an empty LOB locator that can be used to initialize a LOB variable or, in an
UPDATE statement, to initialize a LOB column or attribute to
EMPTY means that the LOB is initialized, but not populated with data.
Note:An empty LOB is not the same as a null LOB, and an empty
CLOBis not the same as a LOB containing a string of 0 length. For more information, see Oracle Database SecureFiles and Large Objects Developer's Guide.
The following example initializes the
ad_photo column of the sample
pm.print_media table to
UPDATE print_media SET ad_photo = EMPTY_BLOB();