![]() ![]() SQL> DEFAULT ON NULL FOR INSERT AND UPDATE ORA-01407: cannot update ("TESTUSER1"."T1"."DESCRIPTION1") to NULL Remember, DEFAULT ON NULL makes a column mandatory, so we can't set the values to null using an update statement. This time the default value was applied whether the description columns were omitted or explicitly set to a null value. Insert into t1 (id, description1, description2) values (1, null, null) The second omits the description columns. ![]() The first explictly references the description columns and assigns a null value. To demonstrate this we create a table with a default value on two of the columns using the two variations of the syntax.ĭescription1 varchar2(15) default on null 'banana',ĭescription2 varchar2(15) default on null for insert only 'apple' The DEFAULT ON NULL FOR INSERT ONLY form was added in 23c to allow us to explicitly state insert-only, but it is functionally identical to DEFAULT ON NULL. In Oracle 12c we got the ability to define a column as DEFAULT ON NULL, allowing it to be assigned a default value even if it was explicitly assigned a null value in an insert statement. If we update the description column to a null value, we see the default value is not applied. Insert into t1 (id, description) values (1, null) Īs expected, the default value was only applied when the description column was omitted from the insert statement. The first explictly references the description column and assigns a null value. ![]() To demonstrate this we create a table with a default value on one of the columns.ĭescription varchar2(15) default 'banana' Originally default values were only applied during insert operations if the column with the default value was not explicitly referenced in the insert statement. Oracle 23c brings similar default value processing to update operations. This replaces explicit null values with the default value in update statements. In Oracle 23c we can define a column as DEFAULT ON NULL FOR INSERT AND UPDATE. Home » Articles » 23c » Here DEFAULT ON NULL FOR INSERT AND UPDATE in Oracle Database 23c ![]()
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