to ensure the integrity of data in multiple tables materialized
HelloI have a problem and I am not able to solve. Partly, it's because of my poor knowledge of SQL. I have three tables and I use a sequence to enter data into them.
I am attached to is to create a materialized view (full or quick, depending on) with discount to the validate option to verify that each table contains unique data to each other.
I write code so you can get there:
CREATE TABLE table_1 (
ID NUMBER PRIMARY KEY
);
CREATE TABLE table_2 (
ID NUMBER PRIMARY KEY
);
CREATE TABLE table_3 (
ID NUMBER PRIMARY KEY
);
INSERT INTO table_1 VALUES (1);
INSERT INTO table_1 VALUES (2);
INSERT INTO table_2 VALUES (3);
INSERT INTO table_2 VALUES (4);
INSERT INTO table_3 VALUES (5);
INSERT INTO table_3 VALUES (6);
I want to write create a materialized view that will give me the output only in the case that it has same values in two different tables. I had to date.
CREATE MATERIALIZED view mv_test
REFRESH COMPLETE ON COMMIT
AS
SELECT count(1) ROW_COUNT
FROM dual
WHERE EXISTS (
SELECT a.id
FROM table_1 a
WHERE a.id IN(
SELECT b.id
FROM table_2 b))
OR EXISTS (
SELECT a.id
FROM table_1 a
WHERE a.id IN
(SELECT c.id
FROM table_3 c))
OR EXISTS (
SELECT b.id
FROM table_2 b
WHERE b.id IN
(SELECT c.id
FROM table_3 c));
ALTER MATERIALIZED VIEW mv_test
ADD CONSTRAINT cs_mv_test
CHECK (row_count = 0) DEFERRABLE;
This sql statement itself returns no line if my logic is correct. And in case there was a few lines in two different tables, it would return 1 and constraint would throw an error.However, I can't create this with ON COMMIT option. When I try to compile I get:
ORA-12054: cannot set the ON COMMIT refresh attribute for the materialized view
I went through the documentation, I tried mat_view creation logs etc.I know that one of the mistakes is that I am referencing the double table and I don't know if I can use EXISTS.
Unfortunately, my SQL wisdom ends here. I need help to rewrite the sql code, so it would be a materialized view with Refresh on the validate option. Help, please!
I know that since I'm on a sequence there is little chance that same value will enter into two different tables, but I would like to make somekind of audit.
Thank you in advance.
>
I know that since I'm on a sequence there is little chance that same value will enter into two different tables, but I would like to make somekind of audit.
If you are certain that you control all the entries in the table and you are probably using a sequence to be inserted in the three tables then there is physically no possible in all tables, you will get duplicate values.
Write something to check if it is the case would be nearly identical to writing something to verify that 1 + 1 is really equal to 2 in 100% of cases.
If you need to, however. consider something similar to what can be better that follows:
select *
from table_1 t1
full outer join table_2 t2 on (t1.id = t2.id)
full outer join table_3 t3 on (t1.id = t2.id
or
t2.id = t3.id)
where t1.id+t2.id+t3.id not in (t1.id,t2.id,t3.id);
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