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POQuery two db using group by and display detail information
 

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  1. POQuery two db using group by and display detail information
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    <p>I have two tables<br> 1: itemInfo</p> <pre><code>product_id brand name category 1 Garden Goodcake cake </code></pre> <p>2: itemRecord</p> <pre><code>record_id shopType price inputTime product_id 1 0 7.2 2012-03-20 17:58:56 1 69 2 6.4 2012-03-20 19:33:12 1 70 0 9.9 2012-03-19 00:00:00 1 71 3 5.5 2012-03-18 05:22:00 1 72 0 6.8 2012-03-19 20:26:29 1 73 0 10.1 2012-03-17 12:27:00 1 74 3 7.9 2012-03-16 00:00:00 1 75 1 6.7 2012-03-15 00:00:00 1 76 1 8.8 2012-03-14 11:24:00 1 77 2 12.5 2012-03-13 10:26:19 1 78 0 7.2 2012-03-21 11:25:23 1 146 2 5 2012-03-21 12:53:04 1 149 3 4.9 2012-03-21 10:00:00 1 150 3 5.1 2012-03-21 12:20:00 1 </code></pre> <p>I would like to display the latest 7 days of cheapest price of product_id = 1. If the same day, the cheapest price is same, just display the latest.<br> The final table should be: </p> <pre><code>product_id brand name category inputTime shopType minimum_price record_id 1 Garden Goodcake cake 2012-03-21 3 4.9 149 1 Garden Goodcake cake 2012-03-20 2 6.4 69 1 Garden Goodcake cake 2012-03-19 2 6.8 72 ... 1 Garden Goodcake cake 2012-03-15 1 6.7 75 </code></pre> <p>I have tried my best to write a sql that like: </p> <pre><code>SELECT r.product_id, i.brand, i.name, i.category, DATE_FORMAT( r.inputTime, '%e-%b' ) AS inputTime, r.shopType, MIN( r.price ) AS minimum_price, r.record_id FROM itemRecord AS r, itemInfo AS i WHERE r.product_id = '1' AND i.id = r.product_id GROUP BY DATE( r.inputTime ) DESC LIMIT 0 , 7 </code></pre> <p>However, the table is: </p> <pre><code>product_id brand name category inputTime shopType minimum_price record_id 1 Garden Goodcake cake 21-Mar 0 4.9 78 1 Garden Goodcake cake 20-Mar 0 6.4 1 1 Garden Goodcake cake 19-Mar 0 6.8 70 1 Garden Goodcake cake 18-Mar 3 5.5 71 1 Garden Goodcake cake 17-Mar 0 10.1 73 1 Garden Goodcake cake 16-Mar 3 7.9 74 1 Garden Goodcake cake 15-Mar 1 6.7 75 </code></pre> <p>For example, the first row result, it displays the correct minimum price 4.9, but the record_id is wrong, also, the shopType is wrong too.<br> I have research a lot, but still cannot solve the problem.<br> Please help...</p>
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