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<article class="doc">
<h1 class="page">Examples</h1>
<div class="sect1">
<h2 id="create-a-table-with-uuid-as-the-primary-key"><a class="anchor" href="#create-a-table-with-uuid-as-the-primary-key"></a>Create a table with UUID as the primary key</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Create the <code>cyclist_name</code> table with UUID as the primary key:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">CREATE TABLE IF NOT EXISTS cycling.cyclist_name (
id UUID PRIMARY KEY,
lastname text,
firstname text
);</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="create-a-compound-primary-key"><a class="anchor" href="#create-a-compound-primary-key"></a>Create a compound primary key</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Create the <code>cyclist_category</code> table and store the data in reverse order:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">CREATE TABLE IF NOT EXISTS cycling.cyclist_category (
category text,
points int,
id UUID,
lastname text,
PRIMARY KEY (category, points)
)
WITH CLUSTERING ORDER BY (points DESC);</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="create-a-composite-partition-key"><a class="anchor" href="#create-a-composite-partition-key"></a>Create a composite partition key</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Create a table that is optimized for query by cyclist rank by year:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">CREATE TABLE IF NOT EXISTS cycling.rank_by_year_and_name (
race_year int,
race_name text,
cyclist_name text,
rank int,
PRIMARY KEY ((race_year, race_name), rank)
);</code></pre>
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<div class="sect1">
<h2 id="create-a-table-with-a-vector-column"><a class="anchor" href="#create-a-table-with-a-vector-column"></a>Create a table with a vector column</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Create a table with a vector column</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">CREATE TABLE IF NOT EXISTS cycling.comments_vs (
record_id timeuuid,
id uuid,
commenter text,
comment text,
comment_vector VECTOR &lt;FLOAT, 5&gt;,
created_at timestamp,
PRIMARY KEY (id, created_at)
)
WITH CLUSTERING ORDER BY (created_at DESC);</code></pre>
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</div>
<div class="sect1">
<h2 id="create-a-table-with-a-frozen-udt"><a class="anchor" href="#create-a-table-with-a-frozen-udt"></a>Create a table with a frozen UDT</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Create the <code>race_winners</code> table that has a frozen user-defined type (UDT):</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">CREATE TABLE IF NOT EXISTS cycling.race_winners (
cyclist_name FROZEN&lt;fullname&gt;,
race_name text,
race_position int,
PRIMARY KEY (race_name, race_position)
);</code></pre>
</div>
</div>
<div class="paragraph">
<p>See <a href="#developing/user-defined-type-create.adoc" class="page unresolved">Create a user-defined type</a> for information on Create UDTs.
UDTs can be created unfrozen if only non-collection fields are used in the user-defined type creation.
If the table is created with an unfrozen UDT, then <a href="#developing/inserting/insert-user-defined-type.adoc" class="page unresolved">individual field values can be updated and deleted</a>.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="create-a-table-with-a-cdc-log"><a class="anchor" href="#create-a-table-with-a-cdc-log"></a>Create a table with a CDC log</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Create a change data capture log for the <code>cyclist_id</code> table:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">CREATE TABLE IF NOT EXISTS cycling.cyclist_id (
lastname text,
firstname text,
age int,
id UUID,
PRIMARY KEY ((lastname, firstname), age)
);</code></pre>
</div>
</div>
<div class="paragraph">
<p>CDC logging must be enabled in cassandra.yaml.</p>
</div>
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<i class="fa icon-caution" title="Caution"></i>
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<div class="paragraph">
<p>Before enabling CDC logging, have a plan for moving and consuming the log information.
After the disk space limit is reached, writes to CDC-enabled tables are rejected until more space is freed.
See <a href="https://docs.datastax.com/en/dse/6.8/dse-admin/datastax_enterprise/config/configCassandra_yaml.html#configCassandra_yaml__cdcSpaceSection">Change-data-capture (CDC) space settings</a> for information about available CDC settings.</p>
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</td>
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</table>
</div>
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</div>
<div class="sect1">
<h2 id="storing-data-in-descending-order"><a class="anchor" href="#storing-data-in-descending-order"></a>Storing data in descending order</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The following example shows a table definition that stores the categories with the highest points first.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">CREATE TABLE IF NOT EXISTS cycling.cyclist_category (
category text,
points int,
id UUID,
lastname text,
PRIMARY KEY (category, points)
)
WITH CLUSTERING ORDER BY (points DESC);</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="restore-commit-log"><a class="anchor" href="#restore-commit-log"></a>Restoring from the table ID for commit log replay</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Recreate a table with its original ID to facilitate restoring table data by replaying commit logs:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">CREATE TABLE IF NOT EXISTS cycling.cyclist_emails (
userid text PRIMARY KEY,
id UUID,
emails set&lt;text&gt;
)
WITH ID = '1bb7516e-b140-11e8-96f8-529269fb1459';</code></pre>
</div>
</div>
<div class="paragraph">
<p>To retrieve a table&#8217;s ID, query the <code>id</code> column of <code>system_schema.tables</code>.
For example:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">SELECT id
FROM system_schema.tables
WHERE keyspace_name = 'cycling'
AND table_name = 'cyclist_emails';</code></pre>
</div>
</div>
<div class="paragraph">
<p>To perform a restoration of the table, see <a href="../../managing/operating/backups.html" class="page">Backups</a> for more information.</p>
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