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POMySQL Using UNION or OUTER LEFT JOIN
 

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    <p>I have been struggling with what seems a simple enough query. I have three tables, Accounts, Contacts &amp; Activities. Everytime an Activity is logged it logs the AccountID, Contact Subject, TimeDate.</p> <p>I query the Activities table to show me all the activity count from the previous week for each AccountID.</p> <p>I use:</p> <pre><code>select accounts.account as Account, count(distinct activities.contactid) as Users, from accounts, activities where activities.accountid=accounts.accountid AND completeddate &gt;= curdate() - INTERVAL DAYOFWEEK(curdate())+6 DAY AND completeddate &lt; curdate() - INTERVAL DAYOFWEEK(curdate())-1 DAY group by accounts.account asc; </code></pre> <p>The result is something like This: </p> <pre><code>Account Users ACME Ltd 4 Warner Bros 6 RBS 9 </code></pre> <p>etc..</p> <p>The activities table has baout 20 million rows and this runs in about 20 seconds.</p> <p>However, I want a comprehensive list. I want to combine the results with a list of AccountID's that havent had any activity for that month. </p> <pre><code>Account Users ACME Ltd 4 Warner Bros 6 RBS 9 Microsoft 0 or NULL </code></pre> <p>etc...</p> <p>i have tried to UNION like this:</p> <pre><code>select Account, '' from Accounts UNION select accounts.account as Account, count(distinct activities.contactid) as Users from accounts, activities where activities.accountid=accounts.accountid AND completeddate &gt;= curdate() - INTERVAL DAYOFWEEK(curdate())+6 DAY AND completeddate &lt; curdate() - INTERVAL DAYOFWEEK(curdate())-1 DAY group by accounts.account asc; </code></pre> <p>From what i understand about UNION is that it should return a unique list (without duplicates). But what i get is a list of aprox 1400 accounts with when I only have approx 900 Accounts.</p> <p>I have tried LEFT OUTER JOIN but this just seemed to run forever ( i killed it after 2 hours)</p> <p>Does anyone have any suggestions on what I can try?</p> <p>Thanks</p>
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