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<li><a href="/docs/2.9.0/machine-learning/binary-classification/knn-classification" class=''>k-NN Classification</a></li>
<li><a href="/docs/2.9.0/machine-learning/binary-classification/ann" class=''>ANN (Approximate Nearest Neighbor)</a></li>
<li><a href="/docs/2.9.0/machine-learning/binary-classification/naive-bayes" class=''>Naive Bayes</a></li>
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<article data-swiftype-index='true'>
<a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/SQL/sql-introduction.adoc" target="_blank">Edit</a>
<h1>Working with SQL</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Ignite comes with ANSI-99 compliant, horizontally scalable and fault-tolerant distributed SQL database. The distribution is provided either by partitioning the data across cluster nodes or by full replication, depending on the use case.</p>
</div>
<div class="paragraph">
<p>As a SQL database, Ignite supports all DML commands including SELECT, UPDATE, INSERT, and DELETE queries and also implements a subset of DDL commands relevant for distributed systems.</p>
</div>
<div class="paragraph">
<p>You can interact with Ignite as you would with any other SQL enabled storage by connecting with <a href="/docs/2.9.0/SQL/JDBC/jdbc-driver/">JDBC</a> or <a href="/docs/2.9.0/SQL/ODBC/odbc-driver">ODBC</a> drivers from both external tools and applications. Java, .NET and C++ developers can leverage native <a href="/docs/2.9.0/SQL/sql-api">SQL APIs</a>.</p>
</div>
<div class="paragraph">
<p>Internally, SQL tables have the same data structure as <a href="/docs/2.9.0/data-modeling/data-modeling#key-value-cache-vs-sql-table">key-value caches</a>. It means that you can change partition distribution of your data and leverage <a href="/docs/2.9.0/data-modeling/affinity-collocation">affinity colocation techniques</a> for better performance.</p>
</div>
<div class="paragraph">
<p>Ignite&#8217;s SQL engine uses H2 Database to parse and optimize queries and generate execution plans.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="distributed-queries">Distributed Queries</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Queries against <a href="/docs/2.9.0/data-modeling/data-partitioning#partitioned">partitioned</a> tables are executed in a distributed manner:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>The query is parsed and split into multiple “map” queries and a single “reduce” query.</p>
</li>
<li>
<p>All the map queries are executed on all the nodes where required data resides.</p>
</li>
<li>
<p>All the nodes provide result sets of local execution to the query initiator that, in turn, will merge provided result sets into the final results.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>You can force a query to be processed locally, i.e. on the subset of data that is stored on the node where the query is executed.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="local-queries">Local Queries</h2>
<div class="sectionbody">
<div class="paragraph">
<p>If a query is executed over a <a href="/docs/2.9.0/data-modeling/data-partitioning#replicated">replicated</a> table, it will be run against the local data.</p>
</div>
<div class="paragraph">
<p>Queries over partitioned tables are executed in a distributed manner.
However, you can force local execution of a query over a partitioned table.
See <a href="/docs/2.9.0/SQL/sql-api#local-execution">Local Execution</a> for details.</p>
</div>
</div>
</div>
<div class="copyright">
© 2020 The Apache Software Foundation.<br/>
Apache, Apache Ignite, the Apache feather and the Apache Ignite logo are either registered trademarks or trademarks of The Apache Software Foundation.
</div>
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