Oracle® Database SQL Language Reference 11g Release 2 (11.2) Part Number E17118-04 |
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EMPTY_BLOB
and EMPTY_CLOB
return an empty LOB locator that can be used to initialize a LOB variable or, in an INSERT
or UPDATE
statement, to initialize a LOB column or attribute to EMPTY
. 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 emptyCLOB
is 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.Restriction on LOB Locators You cannot use the locator returned from this function as a parameter to the DBMS_LOB
package or the OCI.
The following example initializes the ad_photo
column of the sample pm.print_media
table to EMPTY
:
UPDATE print_media SET ad_photo = EMPTY_BLOB();