How to make an update of a view online two tables...

When the unique constraint of the second table includes three columns?

I have two tables A and B and I want to update a table column, one using an update of a view online two tables.

Table A:
col1 primary key
col2

Table B:
col1 u1
col2 u2
COL3 u3
COL4
col5

Table col1 primary key, table B has a unique constraint on col1, col2 and col3.

Tables A and B are joined in this way:
select  A.col1, A.col2 as KEY_OLD, B.col5 as KEY_NEW
from    A, B
where (B.col1 = 'literal_1') and (B.col2 = 'literal_2') and (A.col1 = B.col3) and (A.col2 = B.col4)
And now, I want to update this view and set KEY_OLD = KEY_NEW.

Because of the first three conditions in the where clause for each entry in the table A there is just a matching entry in the table B.
So the table should be preserved in the join key.

But during the update
update (select  A.col1, A.col2 as KEY_OLD, B.col5 as KEY_NEW
            from    A, B
            where (B.col1 = 'literal_1') and (B.col2 = 'literal_2') and (A.col1 = B.col3) and (A.col2 = B.col4)
           )
set     KEY_OLD = KEY_NEW;
I get an error ORA-01779.

I did the updates on inline views this way several times in recent weeks and it work very well.
But so far the unique constraint on the table B was just a column ;-)

So what I need is to make it work with the unique constraint on the application of the three-column table B.

Thank you very much in advance for any help.

Hartmut cordially

Preserved key criteria must be met by the join columns, the optimizer does not agree (in fact I never tried in 11g) just a combination of columns, literals and join.

The alternatives you have are subqueries online (which as you point out can do rather worse), the command MERGE or indicator BYPASS_UJVC semi undocumented.

Tags: Database

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