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    <p>Do you use Oracle? </p> <p>If you use Oracle you can validate the data in a declarative way with the use of a fast refresh materialized view, you have to add a check constraint to this materialized view. This means that the validation will be done when a commit is happening. </p> <p><strong>Edit1</strong></p> <p>It saddens me a little that oo didn't anwer my imho really very simple question, so I don't know whether or not he/she uses Oracle, but anyway:</p> <p>Let's create a table with a materialized view log, a materialized view with a group by on resourceid and a check constraint to check that the sum of PctOfTime equals 100 for every resourceid. </p> <pre><code>create table applicationresources ( id number(10) not null primary key, applicationid number(10) not null, resourceid number(10) not null, pctoftime number(3) not null ); create materialized view log on applicationresources with rowid (id,applicationid,resourceid,pctoftime) including new values; create materialized view pctoftimecheck refresh fast on commit as select sum(pctoftime) sum_time,resourceid from applicationresources group by resourceid / alter table pctoftimecheck add constraint c1 check(sum_time=100); </code></pre> <p>Now two examples:</p> <p>Example1 (will succeed):</p> <pre><code>insert into applicationresources values (1, 1, 1, 50); insert into applicationresources values (2, 2, 1, 50); commit; </code></pre> <p>Example2 (will fail on commit because sum=101)</p> <pre><code>insert into applicationresources values (3, 1, 2, 50); insert into applicationresources values (4, 2, 2, 50); insert into applicationresources values (5, 3, 2, 1); commit; SQL&gt; Error: ORA-02290: CHECK-constraint (DSEDD.C1) violated. </code></pre> <p>See for more info: <a href="http://rwijk.blogspot.com/2009/06/fast-refreshable-materialized-view.html" rel="nofollow noreferrer">http://rwijk.blogspot.com/2009/06/fast-refreshable-materialized-view.html</a></p>
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    1. POdatabase design - how do you use the database to confirm complete data entry and validation
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    1. COStuff like this is better served as a comment - I won't, but others like to mark down uninformed answers like these.
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    2. COLOL, well, I'm not afraid! What exactly is uninformed in my answer by the way?
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    3. CONo down or upvotes yet.
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