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test/check to see if # is unique

Discussion in 'Software Development' started by jbdog4life, Apr 8, 2010.

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  1. jbdog4life

    jbdog4life Thread Starter

    Dec 8, 2009
    I have an add/edit program I've written and I'm trying to find an example of how to test/check an Account Number that a person enters in a textbox to the database(SQL) to make sure it is unique. I've been searching and haven't had any luck. Any Advice? Thanks.
  2. OBP


    Mar 8, 2005
    It would help if we knew which programming language you are using.
    If you set the SQL Table Account Number Field to Unique or "No Duplicates" it should achieve the same thing.
  3. phyrtech


    Mar 22, 2010
    This is the proper way to do it. ^

    Another way is to query the table to find if the value already exists:

    SELECT count(*) from `table` WHERE `id`=23 LIMIT 1;

    This returns 1 if the column `id` already has 23 in a row and 0 if it does not.
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