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When I try to update only the missing data the non-matched data is also updated but to NULL. The reason some of your rows are getting NULLs updated is due to the subquery.When the subquery fails to find a matching row in tbl B, the subquery returns NULL. tablespace_name, s.extent_management FROM user_tables t, user_tablespaces s WHERE t.tablespace_name = s.Question: I want to update multiple rows in my table, and I need to understand how to update multiple columns. You need not specify the partition name when updating values in a partitioned table.However in some cases specifying the partition name can be more efficient than a complicated Specify a complete or partial name of a database link to a remote database where the object is located.Example use case: I have a database that contains a table of contacts (contact) and table of e-mail addresses (email), joined on = email.contact_id.I just found out that Example Conglomerate acquired Osric Publishing’s Oracle consulting business, and so I need to update my contacts database so that all of the Oracle consultants who had @e-mail addresses now have @e-mail addresses.
Consequently, to prevent this, you might do this: One potential issue may arise when the subquery actually finds more than one matching row in tbl B.All INSTEAD OF triggers are fired for each row and you cannot narrow down the event by column.Instead you can check to see what columns are updated in the body of the trigger by using the UPDATING ('column_name') clause.When I ran the SELECT query on its own it returned 163 rows. Here’s the SELECT query I ran Users can have multiple email addresses but the UPDATE query is matching on contact ID in the WHERE clause.However, when I ran the UPDATE query it updated 210 rows. This would update other addresses associated that contact ID has as well.