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<p>As a data analyst in a fitness app company, you are tasked with analyzing the user’s daily step count.</p>

<p>Write a SQL query to calculate the 3-day rolling average of steps for each user, rounded to the nearest whole number.</p>

<p><strong><em>Notes:</em></strong> <em>The rolling average should only be calculated for days where there are 3 previous days of step counts, including the current day. The first 2 days for any user should be excluded.</em></p>

<p><strong>Example:</strong></p>

<p><strong>Input:</strong></p>

<p><code>daily_steps</code> table</p>

<table>
<thead>
<tr>
<th>Column</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td>id</td>
<td>INTEGER</td>
</tr>

<tr>
<td>user_id</td>
<td>INTEGER</td>
</tr>

<tr>
<td>steps</td>
<td>INTEGER</td>
</tr>

<tr>
<td>date</td>
<td>DATE</td>
</tr>
</tbody>
</table>
<p><strong>Output:</strong></p>

<table>
<thead>
<tr>
<th>Column</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td>user_id</td>
<td>INTEGER</td>
</tr>

<tr>
<td>date</td>
<td>DATE</td>
</tr>

<tr>
<td>avg_steps</td>
<td>FLOAT</td>
</tr>
</tbody>
</table>


Calculate the 3-day rolling average of steps for each user.

Rolling Average Steps

<p>Let’s say we have a table with an <code>id</code> and <code>name</code> fields. The table holds over 100 million rows and we want to sample a random row in the table without throttling the database.</p>

<p>Write a query to randomly sample a row from this table.</p>

<p><strong>Input:</strong></p>

<p><code>big_table</code> table</p>

<table>
<thead>
<tr>
<th>Columns</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td><code>id</code></td>
<td>INTEGER</td>
</tr>

<tr>
<td><code>name</code></td>
<td>VARCHAR</td>
</tr>
</tbody>
</table>


Write a query to randomly sample a row from a big table.

Random SQL Sample

<p>Let’s say that your company is running a standard control and variant AB test on a feature to increase conversion rates on the landing page. The PM checks the results and finds a .04 p-value.</p>

<p>How would you assess the validity of the result?</p>


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