duanhuan7750 2013-05-25 19:33
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我无法弄清楚如何编写一个SQL查询来显示我想要的信息

I've gotten my database set up for my website and I'm a little baffled on how I should write the SQL query to display the information how I want it.

Here's an image of how my database is setup and an example of how I want to display it:

Here's the SQL query I wrote to get the information (Im open to writing a better solution)

SELECT * FROM drinks_category, drinks_lookup, drinks
WHERE drinks.drink_id = drinks_lookup.drink_id
AND drinks_lookup.drinks_category_id = drinks_category.drinks_category_id

This gets me all the info but I'm not sure how to write the output to get it to show how i want.

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  • dovzrfr0506 2013-05-25 19:53
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    One solution is to order by category:

    SELECT * 
    FROM drinks_category, drinks_lookup, drinks 
    WHERE drinks.drink_id = drinks_lookup.drink_id 
    AND drinks_lookup.drinks_category_id = drinks_category.drinks_category_id
    ORDER BY drinks_category.drink_category_title
    

    With that, you can loop in PHP, and output a new header whenever a new category appears. Something like this:

    <?php
    $last_category = 0;
    foreach($data as $row) {
        if($row['drinks_category_id'] != $last_category) {
            echo '<h1>' . $row['drink_category_title'] . '</h1>';
        }
        echo '<div>' . $row['drinks_name'] . '</div>';
        $last_category = $row['drinks_category_id'];
    }
    ?>
    

    You should probably use nested html lists instead of the markup above, but this should get you started.

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