UPDATE and DELETE in same SQL in multiple tables?

问题

With Oracle DB, is it possible to update one table and delete (matching rows) in other?

I tried various forms of MERGE but I get either:

ORA-01446: cannot select ROWID from, or sample, a view with DISTINCT, GROUP BY, etc.

(probably caused by UNION ALL in the view)

or

ORA-38106: MERGE not supported on join view or view with INSTEAD OF trigger.

This ("join view") suggests that specifying two tables in any form is a no-go for MERGE. Is that correct?

(the reasons for using a single statement are: performance, consistency and clarity)

My Oracle DB is of version 11.2.

The actual problem is like this:

We (a library) have a (parent) table of books and a (child) table of content (one or zero per book, it has a FK to the books table). Every year we run a job that for each book that is older than 10 years (let's simplify the condition as it is not relevant to the problem here) we set a column named RETIRED to value "YES" in the books table and delete the row (if present) in the content table.

PS: PL/SQL solutions are welcome. (my code is in PL/SQL anyway)

回答1:

Use one transaction with two statements:

1. Update books to retire;
2. Delete content of all the retired books.

PL/SQL solution might be:

DECLARE
 TYPE id_list IS TABLE OF books.id%TYPE;
 retired_list id_list;
BEGIN
  UPDATE books
  SET retired = 'YES'
  WHERE publish_date <= add_months(TRUNC(SYSDATE), -120)
  RETURNING id BULK COLLECT INTO retired_list;

  FORALL id IN retired_list.FIRST .. retired_list.LAST
    DELETE content
    WHERE book_id = retired_list(id);

  COMMIT;
END;
/

来源：https://stackoverflow.com/questions/37690394/update-and-delete-in-same-sql-in-multiple-tables