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Asked: 2026-06-01T20:44:02+00:00

I am trying to add a constraint in MySQL by member, date and question

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I am trying to add a constraint in MySQL by member, date and question so that the same user cant ask the same question more than once a day.

alter table questions add UNIQUE INDEX three_UNIQUE ( member_id , question , date );

but since the question field is long text, i get this error:

ERROR 1071 (42000): Specified key was too long; max key length is 1000 bytes

any way to get around this?

Thanks!!

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1 Answer

  1. Editorial Team

    It doesn’t usually make much sense to specify a unique key constraint on a user entered long text field. The user can still ask the same question more than once, simply by adding a space or making some other minor change.

    If your intention is to prevent accidental reposts then use a hidden field with a GUID or similar unique identifier.

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