analytics/Plausible.Stats.SQL.Fragments.html
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<h1>
<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/stats/sql/fragments.ex#L1" title="View Source" class="icon-action" rel="help">
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<span translate="no">Plausible.Stats.SQL.Fragments</span>
<small class="app-vsn" translate="no">(Plausible v0.0.1)</small>
</h1>
<section id="moduledoc">
<p>Various macros and common SQL fragments used in Stats code.</p>
</section>
<section id="summary" class="details-list">
<h1 class="section-heading">
<a class="hover-link" href="#summary">
<i class="ri-link-m" aria-hidden="true"></i>
</a>
<span class="text">Summary</span>
</h1>
<div class="summary-functions summary">
<h2>
<a href="#functions">Functions</a>
</h2>
<div class="summary-row">
<div class="summary-signature">
<a href="#bounce_rate/0" translate="no">bounce_rate()</a>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#coalesce_string/2" translate="no">coalesce_string(fieldA, fieldB)</a>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#get_by_key/3" translate="no">get_by_key(table, meta_column, key)</a>
</div>
<div class="summary-synopsis"><p>Returns value of a key (usually property) under <code class="inline">meta.value</code> array or similar.</p></div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#has_key/3" translate="no">has_key(table, meta_column, key)</a>
</div>
<div class="summary-synopsis"><p>Returns whether a key (usually property) exists under <code class="inline">meta.key</code> array or similar.</p></div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#meta_key_column/1" translate="no">meta_key_column(atom)</a>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#meta_value_column/1" translate="no">meta_value_column(atom)</a>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#sample_percent/0" translate="no">sample_percent()</a>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#select_join_fields/4" translate="no">select_join_fields(q, query, list, table_name)</a>
</div>
<div class="summary-synopsis"><p>Macro that helps join two Ecto queries by selecting fields from either one</p></div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#select_merge_as/3" translate="no">select_merge_as(q, binding, map_literal)</a>
</div>
<div class="summary-synopsis"><p>Convenience Ecto macro for wrapping select_merge where each value gets in turn passed to selected_as.</p></div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#to_timezone/2" translate="no">to_timezone(date, timezone)</a>
</div>
<div class="summary-synopsis"><p>Converts time or date and time to the specified timezone.</p></div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#total/0" translate="no">total()</a>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#uniq/1" translate="no">uniq(user_id)</a>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#visit_duration/0" translate="no">visit_duration()</a>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#weekstart_not_before/2" translate="no">weekstart_not_before(date, not_before)</a>
</div>
<div class="summary-synopsis"><p>Returns the weekstart for <code class="inline">date</code>. If the weekstart is before the <code class="inline">not_before</code>
boundary, <code class="inline">not_before</code> is returned.</p></div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#wrap_alias/2" translate="no">wrap_alias(binding, map_literal)</a>
</div>
<div class="summary-synopsis"><p>Convenience Ecto macro for wrapping a map passed to select_merge_as such that each
expression gets wrapped in dynamic and set as selected_as.</p></div>
</div>
</div>
</section>
<section id="functions" class="details-list">
<h1 class="section-heading">
<a class="hover-link" href="#functions">
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<span class="text">Functions</span>
</h1>
<div class="functions-list">
<section class="detail" id="bounce_rate/0">
<div class="detail-header">
<a href="#bounce_rate/0" class="detail-link" title="Link to this macro">
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<h1 class="signature" translate="no">bounce_rate()</h1>
<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/stats/sql/fragments.ex#L31" class="icon-action" rel="help" title="View Source">
<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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<span class="note">(macro)</span>
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<section class="docstring">
</section>
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<section class="detail" id="coalesce_string/2">
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<h1 class="signature" translate="no">coalesce_string(fieldA, fieldB)</h1>
<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/stats/sql/fragments.ex#L43" class="icon-action" rel="help" title="View Source">
<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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<span class="note">(macro)</span>
</div>
<section class="docstring">
</section>
</section>
<section class="detail" id="get_by_key/3">
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<h1 class="signature" translate="no">get_by_key(table, meta_column, key)</h1>
<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/stats/sql/fragments.ex#L129" class="icon-action" rel="help" title="View Source">
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<span class="note">(macro)</span>
</div>
<section class="docstring">
<p>Returns value of a key (usually property) under <code class="inline">meta.value</code> array or similar.</p><p>This macro is used for operating on custom properties.
Callsites should also check whether key exists first in SQL via <code class="inline">has_key</code> macro.</p><h2 id="get_by_key/3-examples" class="section-heading">
<a href="#get_by_key/3-examples" class="hover-link">
<i class="ri-link-m" aria-hidden="true"></i>
</a>
<span class="text">Examples</span>
</h2>
<p><code class="inline">get_by_key(e, :meta, &quot;some_property_name&quot;)</code> expands to SQL <code class="inline">meta.value[indexOf(meta.key, &quot;some_property&quot;)]</code></p>
</section>
</section>
<section class="detail" id="has_key/3">
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<h1 class="signature" translate="no">has_key(table, meta_column, key)</h1>
<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/stats/sql/fragments.ex#L109" class="icon-action" rel="help" title="View Source">
<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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</a>
<span class="note">(macro)</span>
</div>
<section class="docstring">
<p>Returns whether a key (usually property) exists under <code class="inline">meta.key</code> array or similar.</p><p>This macro is used for operating on custom properties.</p><h2 id="has_key/3-examples" class="section-heading">
<a href="#has_key/3-examples" class="hover-link">
<i class="ri-link-m" aria-hidden="true"></i>
</a>
<span class="text">Examples</span>
</h2>
<p><code class="inline">has_key(e, :meta, &quot;some_property_name&quot;)</code> expands to SQL <code class="inline">has(meta.key, &quot;some_property_name&quot;)</code></p>
</section>
</section>
<section class="detail" id="meta_key_column/1">
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<h1 class="signature" translate="no">meta_key_column(atom)</h1>
<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/stats/sql/fragments.ex#L140" class="icon-action" rel="help" title="View Source">
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<h1 class="signature" translate="no">meta_value_column(atom)</h1>
<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/stats/sql/fragments.ex#L143" class="icon-action" rel="help" title="View Source">
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<h1 class="signature" translate="no">sample_percent()</h1>
<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/stats/sql/fragments.ex#L25" class="icon-action" rel="help" title="View Source">
<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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<span class="note">(macro)</span>
</div>
<section class="docstring">
</section>
</section>
<section class="detail" id="select_join_fields/4">
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<h1 class="signature" translate="no">select_join_fields(q, query, list, table_name)</h1>
<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/stats/sql/fragments.ex#L185" class="icon-action" rel="help" title="View Source">
<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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</a>
<span class="note">(macro)</span>
</div>
<section class="docstring">
<p>Macro that helps join two Ecto queries by selecting fields from either one</p>
</section>
</section>
<section class="detail" id="select_merge_as/3">
<div class="detail-header">
<a href="#select_merge_as/3" class="detail-link" title="Link to this macro">
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<h1 class="signature" translate="no">select_merge_as(q, binding, map_literal)</h1>
<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/stats/sql/fragments.ex#L176" class="icon-action" rel="help" title="View Source">
<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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</a>
<span class="note">(macro)</span>
</div>
<section class="docstring">
<p>Convenience Ecto macro for wrapping select_merge where each value gets in turn passed to selected_as.</p><h3 id="select_merge_as/3-examples" class="section-heading">
<a href="#select_merge_as/3-examples" class="hover-link">
<i class="ri-link-m" aria-hidden="true"></i>
</a>
<span class="text">Examples</span>
</h3>
<p> iex&gt; select_merge_as(q, [t], %{ foo: t.column }) |&gt; expand_macro_once
&quot;select_merge(q, [], ^wrap_alias([t], %{foo: t.column}))&quot;</p>
</section>
</section>
<section class="detail" id="to_timezone/2">
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<h1 class="signature" translate="no">to_timezone(date, timezone)</h1>
<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/stats/sql/fragments.ex#L54" class="icon-action" rel="help" title="View Source">
<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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</a>
<span class="note">(macro)</span>
</div>
<section class="docstring">
<p>Converts time or date and time to the specified timezone.</p><p>Reference: <a href="https://clickhouse.com/docs/en/sql-reference/functions/date-time-functions/#totimezone">https://clickhouse.com/docs/en/sql-reference/functions/date-time-functions/#totimezone</a></p>
</section>
</section>
<section class="detail" id="total/0">
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<h1 class="signature" translate="no">total()</h1>
<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/stats/sql/fragments.ex#L19" class="icon-action" rel="help" title="View Source">
<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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<span class="note">(macro)</span>
</div>
<section class="docstring">
</section>
</section>
<section class="detail" id="uniq/1">
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<h1 class="signature" translate="no">uniq(user_id)</h1>
<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/stats/sql/fragments.ex#L13" class="icon-action" rel="help" title="View Source">
<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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</a>
<span class="note">(macro)</span>
</div>
<section class="docstring">
</section>
</section>
<section class="detail" id="visit_duration/0">
<div class="detail-header">
<a href="#visit_duration/0" class="detail-link" title="Link to this macro">
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<h1 class="signature" translate="no">visit_duration()</h1>
<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/stats/sql/fragments.ex#L37" class="icon-action" rel="help" title="View Source">
<i class="ri-code-s-slash-line" aria-hidden="true"></i>
<span class="sr-only">View Source</span>
</a>
<span class="note">(macro)</span>
</div>
<section class="docstring">
</section>
</section>
<section class="detail" id="weekstart_not_before/2">
<div class="detail-header">
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<h1 class="signature" translate="no">weekstart_not_before(date, not_before)</h1>
<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/stats/sql/fragments.ex#L88" class="icon-action" rel="help" title="View Source">
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<span class="note">(macro)</span>
</div>
<section class="docstring">
<p>Returns the weekstart for <code class="inline">date</code>. If the weekstart is before the <code class="inline">not_before</code>
boundary, <code class="inline">not_before</code> is returned.</p><h2 id="weekstart_not_before/2-examples" class="section-heading">
<a href="#weekstart_not_before/2-examples" class="hover-link">
<i class="ri-link-m" aria-hidden="true"></i>
</a>
<span class="text">Examples</span>
</h2>
<p>In this pseudo-code example, the fragment returns the weekstart. The
<code class="inline">not_before</code> boundary is set to the past Saturday, which is before the
weekstart, therefore the cap does not apply.</p><pre><code class="makeup elixir" translate="no"><span class="w"> </span><span class="o">&gt;</span><span class="w"> </span><span class="n">this_wednesday</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="ld">~D[2022-11-09]</span><span class="w">
</span><span class="o">&gt;</span><span class="w"> </span><span class="n">past_saturday</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="ld">~D[2022-11-05]</span><span class="w">
</span><span class="o">&gt;</span><span class="w"> </span><span class="n">weekstart_not_before</span><span class="p" data-group-id="0300538843-1">(</span><span class="n">this_wednesday</span><span class="p">,</span><span class="w"> </span><span class="n">past_saturday</span><span class="p" data-group-id="0300538843-1">)</span><span class="w">
</span><span class="ld">~D[2022-11-07]</span></code></pre><p>In this other example, the fragment returns Tuesday and not the weekstart.
The <code class="inline">not_before</code> boundary is set to Tuesday, which is past the weekstart,
therefore the cap applies.</p><pre><code class="makeup elixir" translate="no"><span class="w"> </span><span class="o">&gt;</span><span class="w"> </span><span class="n">this_wednesday</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="ld">~D[2022-11-09]</span><span class="w">
</span><span class="o">&gt;</span><span class="w"> </span><span class="n">this_tuesday</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="ld">~D[2022-11-08]</span><span class="w">
</span><span class="o">&gt;</span><span class="w"> </span><span class="n">weekstart_not_before</span><span class="p" data-group-id="9957845859-1">(</span><span class="n">this_wednesday</span><span class="p">,</span><span class="w"> </span><span class="n">this_tuesday</span><span class="p" data-group-id="9957845859-1">)</span><span class="w">
</span><span class="ld">~D[2022-11-08]</span></code></pre>
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<h1 class="signature" translate="no">wrap_alias(binding, map_literal)</h1>
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<p>Convenience Ecto macro for wrapping a map passed to select_merge_as such that each
expression gets wrapped in dynamic and set as selected_as.</p><h3 id="wrap_alias/2-examples" class="section-heading">
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<p> iex&gt; wrap_alias([t], %{ foo: t.column }) |&gt; expand_macro_once
&quot;%{foo: dynamic([t], selected_as(t.column, :foo))}&quot;</p>
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