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Asked: 2026-06-17T18:45:03+00:00

I have a field area_code in mysql table by php form. I need the

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I have a field area_code in mysql table by php form. I need the validation & alert when typing the same area code which is already entered and stored in database.

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  1. Editorial Team

    The best way you do is to define a UNIQUE constraint on field area_code on the table.

    ALTER TABLE tableName ADD CONSTRAINT tb_UQ UNIQUE (area_code)

    if the code was executed and successful, the server will generate an error if you try to enter area_code that is already present on the table.

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