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POPHP mySQL - select unique value that not being used from dirrefent table
 

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  1. POPHP mySQL - select unique value that not being used from dirrefent table
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    <p><strong>Updates : Please see below</strong></p> <p>i have table: data</p> <pre><code>+-----------------------+--------------+-----------+ | State | d_country | d_postcode| +-----------------------+--------------+-----------+ | State1 | Country1 | 1111 | | State2 | Country2 | 2222 | | State3 | Country3 | 3333 | | State4 | Country4 | 4444 | +-----------------------+--------------+-----------+ </code></pre> <p>And another table: user</p> <pre><code>+-----------------------+--------------+-----------+ | Name | u_country | u_postcode| +-----------------------+--------------+-----------+ | Name1 | Country3 | 3333 | | Name2 | Country5 | 5555 | | Name3 | | 6666 | | Name4 | Country6 | 6666 | | Name5 | Country6 | 6666 | +-----------------------+--------------+-----------+ </code></pre> <p>What SQL should i use to:</p> <p><strike> Determine the number (count) of country that are not listed on table data. For example <code>u_postcode</code> is not listed in <code>d_postcode</code> is 5555 and 6666. It will return 2.</p> <p>List down name and what country not available in table data yet.</strike> </p> <p><strong>Updates</strong></p> <ol start="3"> <li>I want to use grouping to filter postcode and make Name3 and Name4 as different rows.</li> </ol> <p>For example:</p> <pre><code> +-----------------------+--------------+-----------+ | Name | u_country | u_postcode| +-----------------------+--------------+-----------+ | Name2 | Country5 | 5555 | | Name3 | | 6666 | | Name4 | Country6 | 6666 | +-----------------------+--------------+-----------+ </code></pre> <p>Any possible idea?</p> <p><strong>Remarks:</strong> Corrected myself</p> <pre><code>SELECT DISTINCT Name, u_country, u_postcode FROM user WHERE u_postcode NOT IN (SELECT d_postcode FROM data) </code></pre>
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      1. POPHP mySQL - select unique value that not being used from dirrefent table
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    1. COIs this homework? Looks like a homework question
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    2. COno this is not homework. but anyone want to make this as homework also can. :). i know the hard way but want to use simplest query like 2-10 lines to achieve this. like JOIN, IN inner JOIN but do not know how to. still research. and not found :(
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    3. COi have this: http://stackoverflow.com/questions/150610/selecting-unique-rows-in-a-set-of-two-possibilities and this: http://stackoverflow.com/questions/190702/mysql-select-n-rows-but-with-only-unique-values-in-one-column related to my problem. it's near but i have no idea yet.
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