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POHow to Query a Table with Multiple Foreign Keys and Return Actual Values
 

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  1. POHow to Query a Table with Multiple Foreign Keys and Return Actual Values
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    <p>New to MySQL, so please bear with me.</p> <p>I'm working on a project that collects user's degrees. Users can save 3 degrees where the type, subject matter, and school are variable. These relations are normalized for other query uses so 5 tables are involved and are shown below (all have more columns then shown, just included the relevant info). The last one, 'user_degrees' is where the keys come together.</p> <p>degrees</p> <pre><code>+----+-------------------+ | id | degree_type | +----+-------------------+ | 01 | Bachelor's Degree | | 02 | Master's Degree | | 03 | Ph.D. | | 04 | J.D. | +----+-------------------+ </code></pre> <p>acad_category</p> <pre><code>+------+-----------------------------------------+ | id | acad_cat_name | +------+-----------------------------------------+ | 0015 | Accounting | | 0026 | Business Law | | 0027 | Finance | | 0028 | Hotel &amp; Restaurant Management | | 0029 | Human Resources | | 0030 | Information Systems and Technology | +------+-----------------------------------------+ </code></pre> <p>institutions</p> <pre><code>+--------+--------------------------------------------+ | id | inst_name | +--------+--------------------------------------------+ | 000001 | A T Still University of Health Sciences | | 000002 | Abilene Christian University | | 000003 | Abraham Baldwin Agricultural College | +------+----------------------------------------------+ </code></pre> <p>users</p> <pre><code>+----------+----------+ | id | username | +----------+----------+ | 00000013 | Test1 | | 00000018 | Test2 | | 00000023 | Test3 | +----------+----------+ </code></pre> <p>user_degrees</p> <pre><code>+---------+-----------+---------+---------+ | user_id | degree_id | acad_id | inst_id | +---------+-----------+---------+---------+ | 18 | 1 | 4 | 1 | | 23 | 1 | 15 | 1 | | 23 | 2 | 15 | 1 | | 23 | 3 | 15 | 1 | +---------+-----------+---------+---------+ </code></pre> <p>How can I query 'user_degrees' to find all degrees by user x, but return the actual values of the foreign keys? Taking user <code>Test3</code> as an example, I'm looking for output like so (truncated for layout's sake):</p> <pre><code>+-------------------+-------------------+-------------------+ | degree_type | acad_cat_name | inst_name | +-------------------+-------------------+-------------------+ | Bachelor's Degree | Accounting | A T Still Uni.. | | Master's Degree | Accounting | A T Still Uni.. | | Ph.D. | Accounting | A T Still Uni.. | +-------------------+-------------------+-------------------+ </code></pre> <p>I'm guessing a mix of multiple joins, temp tables and subqueries are the answer but am having trouble grasping the order of things. Any insight is much appreciated, thanks for reading.</p>
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