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POComparing two date ranges within the same table
 

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  1. POComparing two date ranges within the same table
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    <p>I have a table with sales per store as follows:</p> <pre><code>SQL&gt; select * from sales; ID ID_STORE DATE TOTAL ---------- -------- ---------- ------------------------------- 1 1 2010-01-01 500.00 2 1 2010-01-02 185.00 3 1 2010-01-03 135.00 4 1 2009-01-01 165.00 5 1 2009-01-02 175.00 6 5 2010-01-01 130.00 7 5 2010-01-02 135.00 8 5 2010-01-03 130.00 9 6 2010-01-01 100.00 10 6 2010-01-02 12.00 11 6 2010-01-03 85.00 12 6 2009-01-01 135.00 13 6 2009-01-02 400.00 14 6 2009-01-07 21.00 15 6 2009-01-08 45.00 16 8 2009-01-09 123.00 17 8 2009-01-10 581.00 17 rows selected. </code></pre> <p>What I need to do is to compare two date ranges within that table. Lets say I need to know the differences in sales between 01 Jan 2009 to 10 Jan 2009 AGAINST 01 Jan 2010 to 10 Jan 2010.</p> <p>I'd like to build a query that returns something like this:</p> <pre><code>ID_STORE_A DATE_A TOTAL_A ID_STORE_B DATE_B TOTAL_B ---------- ---------- --------- ---------- ---------- ------------------- 1 2010-01-01 500.00 1 2009-01-01 165.00 1 2010-01-02 185.00 1 2009-01-02 175.00 1 2010-01-03 135.00 1 NULL NULL 5 2010-01-01 130.00 5 NULL NULL 5 2010-01-02 135.00 5 NULL NULL 5 2010-01-03 130.00 5 NULL NULL 6 2010-01-01 100.00 6 2009-01-01 135.00 6 2010-01-02 12.00 6 2009-01-02 400.00 6 2010-01-03 85.00 6 NULL NULL 6 NULL NULL 6 2009-01-07 21.00 6 NULL NULL 6 2009-01-08 45.00 6 NULL NULL 8 2009-01-09 123.00 6 NULL NULL 8 2009-01-10 581.00 </code></pre> <p>So, even if there are no sales in one range or another, it should just fill the empty space with NULL.</p> <p>So far, I've come up with this quick query, but I the "dates" from sales to sales2 sometimes are different in each row:</p> <pre><code>SELECT sales.*, sales2.* FROM sales LEFT JOIN sales AS sales2 ON (sales.id_store=sales2.id_store) WHERE sales.date &gt;= '2010-01-01' AND sales.date &lt;= '2010-01-10' AND sales2.date &gt;= '2009-01-01' AND sales2.date &lt;= '2009-01-10' ORDER BY sales.id_store ASC, sales.date ASC, sales2.date ASC </code></pre> <p>What am I missing?</p>
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    1. USJonathan Leffler
    1. USDanny H
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      1. VTUpMod
    2. VO
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    3. VO
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    1. COyou need to learn about 'GROUP BY' and sub-queries.
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      1. USlexu
    2. COWith nulls on both sides, you probably need a FULL OUTER JOIN rather than a LEFT OUTER JOIN or a RIGHT OUTER JOIN.
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      1. USJonathan Leffler
 

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