Column of child binding between the values of the parent record

I know it is not a declarative constraint to do, but I wonder what ideas have for the best model to use.

I have a table parent ALPHA with columns ALPHA_ID, start_date and end_date.
Then I have a BETA child table with columns BETA_ID, ALPHA_ID, and TRAN_DATE.

I would like to limit this BETA. TRAN_DATE is located between ALPHA. Start_date and ALPHA. End_date I hesitate to use a trigger because BETA will be many inserts.

I looked at the creation of an ALPHA_DATE table with the columns TRAN_DATE, ALPHA_ID, start_date and end_date, with the first three columns as foreign key the same columns in ALPHA, and a CHECK constraint that (TRAN_DATE between start_date and end_date), then leave BETA (ALPHA_ID, TRAN_DATE) be a foreign key for ALPHA_DATE (ALPHA_ID TRAN_DATE).

Thank you
Matt

Personally I would generate just triggers for it. And see if the drop in performance may be taken.

Of course, in Oracle14 (or more?) you can do:

create assertion alpha_beta_date_constraint
check(not exists
(select 'tuple in this join'
 from alpha a
     ,beta b
 where a.alpha_id = b.alpha_id
    and not (b.tran_date between a.start_date and a.end_date)
))
/

You can also use the infamous thing materialized view.
-Create a MV that's bassically by using the query above to search for the faulty lines.
-Add a check on this MV constraint which is always false (for example, check (0 = 1)).
-Do a refresh on the validation of MV type.

Tags: Database

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