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POCreate composite column keys/names in Cassandra CQL3
 

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    <p>I would like to create a table in Cassandra using CQL3 queries with structure similar to:</p> <pre><code>myTable myTable_uuid &lt;key_1|second_key_1&gt; : &lt;value_1&gt;, &lt;key_1|second_key_2&gt; : &lt;value_2&gt;, &lt;key_1|second_key_3&gt; : &lt;value_3&gt;, &lt;key_2|second_key_4&gt; : &lt;value_4&gt;, &lt;key_2|second_key_5&gt; : &lt;value_5&gt;, &lt;key_2|second_key_6&gt; : &lt;value_6&gt; PRIMARY KEY(myTable_uuid, first_key_1, first_key_2, second_key_1) </code></pre> <p>Table/CF name is 'myTable' and myTable_uuid is the row key. Additionally I would like to create composite column keys, using CQL3, to be able to group data (key_1 and key_2 form the groups). Is this supported? If yes could someone help me with an example CQL3 query, or the syntax. </p> <p>Purpose: I am trying to design CFs so that data/values are grouped logically, something like the data model explained in Cassandra at ebay blog (<a href="http://www.ebaytechblog.com/2012/07/16/cassandra-data-modeling-best-practices-part-1/" rel="nofollow">http://www.ebaytechblog.com/2012/07/16/cassandra-data-modeling-best-practices-part-1/</a>).</p> <p><em><strong>UPDATE</em></strong></p> <p>I am designing keeping in mind my application and the queries I need. I should have used a real-life query instead of dummy, but here is what I am trying to achieve:</p> <pre><code>myTable myTable_uuid &lt;email|fname&gt; : &lt;value_1&gt;, &lt;email|lname&gt; : &lt;value_2&gt;, &lt;email|age&gt; : &lt;value_3&gt;, &lt;email|timestamp&gt; : &lt;value_4&gt;, &lt;shool_id|school_name&gt; : &lt;value_5&gt;, &lt;shool_id|zip_code&gt; : &lt;value_6&gt; PRIMARY KEY(myTable_uuid, email, school_id, school_name) </code></pre> <p>The <code>&lt;email|fname&gt; , &lt;email|lname&gt;, &lt;email|age&gt;, &lt;shool_id|school_name&gt; and &lt;shool_id|zip_code&gt;</code> would behave as 'Composite Column Keys' and not Row Keys, the table has 'myTable_uuid' as it's Row Key. This approach would help me to group my data into 'email' and 'school_id'. How do I create 'Composite Column Keys' and is it supported to query based on only 1 of the Composite CK? For example:</p> <p><code>SELECT fname, age WHERE email = 'xyz@gmail.com'</code></p> <p>I'm using Cassandra 1.2.6 and CQL3. Any help is appreciated. </p>
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