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Querying and segmenting subscribers
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Querying and segmenting subscribers
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Querying attributes
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<li class="md-nav__item">
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<a href="#multiple-conditions" class="md-nav__link">
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Multiple conditions
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<li class="md-nav__item">
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<a href="#querying-attributes" class="md-nav__link">
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Querying attributes
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#querying-nested-attributes" class="md-nav__link">
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Querying nested attributes
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</a>
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</li>
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<h1 id="querying-and-segmenting-subscribers">Querying and segmenting subscribers<a class="headerlink" href="#querying-and-segmenting-subscribers" title="Permanent link">¶</a></h1>
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<p>listmonk allows the writing of partial Postgres SQL expressions to query, filter, and segment subscribers.</p>
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<h2 id="database-fields">Database fields<a class="headerlink" href="#database-fields" title="Permanent link">¶</a></h2>
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<p>These are the fields in the subscriber database that can be queried.</p>
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<table>
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<thead>
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<tr>
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<th>Field</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>subscribers.uuid</code></td>
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<td>The randomly generated unique ID of the subscriber</td>
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</tr>
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<tr>
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<td><code>subscribers.email</code></td>
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<td>E-mail ID of the subscriber</td>
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</tr>
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<tr>
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<td><code>subscribers.name</code></td>
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<td>Name of the subscriber</td>
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</tr>
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<tr>
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<td><code>subscribers.status</code></td>
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<td>Status of the subscriber (enabled, disabled, blocklisted)</td>
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</tr>
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<tr>
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<td><code>subscribers.attribs</code></td>
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<td>Map of arbitrary attributes represented as JSON. Accessed via the <code>-></code> and <code>->></code> Postgres operator.</td>
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</tr>
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<tr>
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<td><code>subscribers.created_at</code></td>
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<td>Timestamp when the subscriber was first added</td>
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</tr>
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<tr>
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<td><code>subscribers.updated_at</code></td>
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<td>Timestamp when the subscriber was modified</td>
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</tr>
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</tbody>
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</table>
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<h2 id="sample-attributes">Sample attributes<a class="headerlink" href="#sample-attributes" title="Permanent link">¶</a></h2>
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<p>Here's a sample JSON map of attributes assigned to an imaginary subscriber.</p>
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<div class="highlight"><pre><span></span><code><span class="p">{</span>
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<span class="w"> </span><span class="nt">"city"</span><span class="p">:</span><span class="w"> </span><span class="s2">"Bengaluru"</span><span class="p">,</span>
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<span class="w"> </span><span class="nt">"likes_tea"</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span>
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<span class="w"> </span><span class="nt">"spoken_languages"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"English"</span><span class="p">,</span><span class="w"> </span><span class="s2">"Malayalam"</span><span class="p">],</span>
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<span class="w"> </span><span class="nt">"projects"</span><span class="p">:</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span>
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<span class="w"> </span><span class="nt">"stack"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="nt">"frameworks"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"echo"</span><span class="p">,</span><span class="w"> </span><span class="s2">"go"</span><span class="p">],</span>
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<span class="w"> </span><span class="nt">"languages"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"go"</span><span class="p">,</span><span class="w"> </span><span class="s2">"python"</span><span class="p">],</span>
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<span class="w"> </span><span class="nt">"preferred_language"</span><span class="p">:</span><span class="w"> </span><span class="s2">"go"</span>
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<span class="w"> </span><span class="p">}</span>
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<span class="p">}</span>
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</code></pre></div>
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<p><img alt="listmonk screenshot" src="../images/edit-subscriber.png" /></p>
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<h2 id="sample-sql-query-expressions">Sample SQL query expressions<a class="headerlink" href="#sample-sql-query-expressions" title="Permanent link">¶</a></h2>
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<p><img alt="listmonk" src="../images/query-subscribers.png" /></p>
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<h4 id="find-a-subscriber-by-e-mail">Find a subscriber by e-mail<a class="headerlink" href="#find-a-subscriber-by-e-mail" title="Permanent link">¶</a></h4>
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<div class="highlight"><pre><span></span><code><span class="c1">-- Exact match</span>
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<span class="n">subscribers</span><span class="p">.</span><span class="n">email</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s1">'some@domain.com'</span>
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<span class="c1">-- Partial match to find e-mails that end in @domain.com.</span>
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<span class="n">subscribers</span><span class="p">.</span><span class="n">email</span><span class="w"> </span><span class="k">LIKE</span><span class="w"> </span><span class="s1">'%@domain.com'</span>
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</code></pre></div>
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<h4 id="find-a-subscriber-by-name">Find a subscriber by name<a class="headerlink" href="#find-a-subscriber-by-name" title="Permanent link">¶</a></h4>
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<div class="highlight"><pre><span></span><code><span class="c1">-- Find all subscribers whose name start with John.</span>
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<span class="n">subscribers</span><span class="p">.</span><span class="n">email</span><span class="w"> </span><span class="k">LIKE</span><span class="w"> </span><span class="s1">'John%'</span>
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</code></pre></div>
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<h4 id="multiple-conditions">Multiple conditions<a class="headerlink" href="#multiple-conditions" title="Permanent link">¶</a></h4>
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<div class="highlight"><pre><span></span><code><span class="c1">-- Find all Johns who have been blocklisted.</span>
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<span class="n">subscribers</span><span class="p">.</span><span class="n">email</span><span class="w"> </span><span class="k">LIKE</span><span class="w"> </span><span class="s1">'John%'</span><span class="w"> </span><span class="k">AND</span><span class="w"> </span><span class="n">status</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s1">'blocklisted'</span>
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</code></pre></div>
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<h4 id="querying-attributes">Querying attributes<a class="headerlink" href="#querying-attributes" title="Permanent link">¶</a></h4>
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<div class="highlight"><pre><span></span><code><span class="c1">-- The ->> operator returns the value as text. Find all subscribers</span>
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<span class="c1">-- who live in Bengaluru and have done more than 3 projects.</span>
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<span class="c1">-- Here 'projects' is cast into an integer so that we can apply the</span>
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<span class="c1">-- numerical operator ></span>
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<span class="n">subscribers</span><span class="p">.</span><span class="n">attribs</span><span class="o">->></span><span class="s1">'city'</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s1">'Bengaluru'</span><span class="w"> </span><span class="k">AND</span>
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<span class="w"> </span><span class="p">(</span><span class="n">subscribers</span><span class="p">.</span><span class="n">attribs</span><span class="o">->></span><span class="s1">'projects'</span><span class="p">)::</span><span class="nb">INT</span><span class="w"> </span><span class="o">></span><span class="w"> </span><span class="mi">3</span>
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</code></pre></div>
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<h4 id="querying-nested-attributes">Querying nested attributes<a class="headerlink" href="#querying-nested-attributes" title="Permanent link">¶</a></h4>
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<div class="highlight"><pre><span></span><code><span class="c1">-- Find all blocklisted subscribers who like to drink tea, can code Python</span>
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<span class="c1">-- and prefer coding Go.</span>
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<span class="c1">--</span>
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<span class="c1">-- The -> operator returns the value as a structure. Here, the "languages" field</span>
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<span class="c1">-- The ? operator checks for the existence of a value in a list.</span>
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<span class="n">subscribers</span><span class="p">.</span><span class="n">status</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s1">'blocklisted'</span><span class="w"> </span><span class="k">AND</span>
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<span class="w"> </span><span class="p">(</span><span class="n">subscribers</span><span class="p">.</span><span class="n">attribs</span><span class="o">->></span><span class="s1">'likes_tea'</span><span class="p">)::</span><span class="nb">BOOLEAN</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">true</span><span class="w"> </span><span class="k">AND</span>
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<span class="w"> </span><span class="n">subscribers</span><span class="p">.</span><span class="n">attribs</span><span class="o">-></span><span class="s1">'stack'</span><span class="o">-></span><span class="s1">'languages'</span><span class="w"> </span><span class="o">?</span><span class="w"> </span><span class="s1">'python'</span><span class="w"> </span><span class="k">AND</span>
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<span class="w"> </span><span class="n">subscribers</span><span class="p">.</span><span class="n">attribs</span><span class="o">-></span><span class="s1">'stack'</span><span class="o">->></span><span class="s1">'preferred_language'</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s1">'go'</span>
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</code></pre></div>
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<p>To learn how to write SQL expressions to do advancd querying on JSON attributes, refer to the Postgres <a href="https://www.postgresql.org/docs/11/functions-json.html">JSONB documentation</a>.</p>
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