I am creating a college event database in MySQL and I want to add a check constraint that prevents two events from overlapping. But when I execute the following constraint I get an error that says: "Error Code: 3815. An expression of a check constraint 'events_chk_1' contains disallowed function." ALTER TABLE Events ADD CHECK (NOT EXISTS (SELECT * FROM Events E WHERE (E.LocID=LocID) AND (E.Date=Date) AND ((End-E.Start) > 0) AND ((E.End-Start) > 0))) What is causing this error

I am creating a college event database in MySQL and I want to add a check constraint that prevents two events from overlapping. But when I execute the following constraint I get an error that says: "Error Code: 3815. An expression of a check constraint 'events_chk_1' contains disallowed function." ALTER TABLE Events ADD CHECK (NOT EXISTS (SELECT * FROM Events E WHERE (E.LocID=LocID) AND (E.Date=Date) AND ((End-E.Start) > 0) AND ((E.End-Start) > 0))) What is causing this error

Oracle 12c: SQL

3rd Edition

ISBN:9781305251038

Author:Joan Casteel

Publisher:Joan Casteel

Chapter6: Additional Database Objects

Section: Chapter Questions

Problem 1HOA

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