Ensure Oracle row represents a unique timespan

Posted by Dan F. on Stack Overflow See other posts from Stack Overflow or by Dan F.
Published on 2010-05-24T19:48:26Z Indexed on 2010/05/24 20:01 UTC
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Oracle

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plsql

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check-constraints

I have to make a process in Oracle/PLSQL. I have to verify that the interval of time between start_date and end_date from a new row that I create must not intersect other start_dates and end_dates from other rows.

Now I need to check each row for that condition and if it doesn't correspond the repetitive instruction should stop and after that to display a message such as "The interval of time given is not correct".

I don't know how to make repetitive instructions in Oracle/PLSQL and I would appreciate if you would help me.

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