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<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>


Experiment Validity

<p>You are testing hundreds of hypotheses with many <em>t</em>-tests. What considerations should be made?</p>


<p>What is a key disadvantage of the F-test when compared to multiple t-tests?</p>

What is a key disadvantage of the F-test when compared to multiple t-tests?

Hundreds of Hypotheses

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

Zortech Solutions Salaries by Position

<h3>Job Description</h3><div>Job Description<div><p><b>Role: Data Engineer -Oracle NetSuite</b></p><p><b>Location: Remote-US</b></p><p><b>Duration: 6+ Months</b></p><p><b>Job Description:</b></p><p><b>Mid Senior level experience of Oracle NetSuite, Azure, ADF, Data Migration Projects, Banking domain</b></p><p><b>Exp: 8+</b></p><p><b>Skills:</b></p><p> Experience of Oracle NetSuite, Azure, ADF, Data Migration Projects</p><p> Great hands-on experience with Databricks platform. Extensive experience in PySpark coding. </p><p> Excellent written and verbal communication, intellectual curiosity, a passion to understand and solve problems, consulting & customer service </p><p> Structured and conceptual mindset coupled with strong quantitative and analytical problem-solving aptitude </p><p> Exceptional interpersonal and collaboration skills within a team environment </p><p>Responsibilities:</p><p> Design, develop, and deploy Databricks jobs to process and analyze large volumes of data. </p><p> Collaborate with data engineers and data scientists to understand data requirements and implement appropriate data processing pipelines. </p><p> Optimize Databricks jobs for performance and scalability to handle big data workloads.</p><p> Monitor and troubleshoot Databricks jobs, identify and resolve issues or bottlenecks. </p><p> Implement best practices for data management, security, and governance within the Databricks environment. </p></div></div>

<h3>Job Description</h3><div>Job Description<div><div><b>Role: Business Data Analyst</b></div><div><b>Location: Mountain View CA (Hybrid)</b></div><div><b>Duration: 6+ Months</b></div><div><b>Job Description:</b></div><div><b>Must have : SQL and hands on exp on Qlik sense</b></div><div><b>Need Strong profile with Qlik exp</b></div><div><b>Business Data Analyst with strong exp with Qlik</b></div><ul><li><div>relevant experience with a proven track record of leveraging analytics to drive significant business impact</div></li><li><div>Superior technical knowledge & proficiency with SQL to perform data acquisition, segmentation, and aggregation from existing data sources</div></li><li><div>Extensive data visualization experience with Qlik. Qlik certification is a big plus</div></li><li><div>Knowledge of programming languages, automation tools and stats packages (e.g., python, SAS, Alteryx, hive, R) preferable</div></li><li><div>Exceptional analytical skills and strong business acumen</div></li><li><div>Outstanding communication skills with the ability to influence decision makers and build consensus with teams</div></li><li><div>Project Management skills and ability to manage multiple projects simultaneously to meet objectives and key deadlines</div></li><li><div>Comfortable working in a fast-paced environment and have flexibility to shift priorities when needed</div></li><li><div>Bachelor's degree in business, engineering, Math, Statistics, Finance, Economics, or a related field. MBA or graduate degree in a related field a plus. Equivalent Experience will be considered</div></li></ul></div></div>

<h3>Job Description</h3><div>Job Description<div><div><b>Role: Data Analyst - strong Qlik Sense</b></div><div><b>Location: Mountain View CA (hybrid - 2-3 days from office)</b></div><div><b>Duration: 6+ Months</b></div><div><b>Job Description:</b></div><div><b>Must have: Qlik Sense , Github , SQL exp</b></div><div>Experience with KPIs related to Customer Success and Customer Experience. Should require minimal handholding.</div><ol><li><div>Analyze customer behavior and feature usage data to identify key drivers of KPIs.</div></li><li><div>Determine which customer actions and product interactions have the most significant impact on KPI performance.</div></li><li><div>Conduct a thorough analysis of existing KPIs to understand their relationship with higher-level company metrics and ROI.</div></li><li><div>Quantify the impact of incremental improvements in KPIs on overall business performance.</div></li></ol><div></div></div></div>

<h3>Job Description</h3><div>Job Description<div><div><b>Position:</b> Business Analyst</div><div><b>Domain: </b>Insurance</div><div><b>Location:</b> Chicago, IL</div><p><b>Job Summary:</b></p><p>We are seeking a strong <b>Business Analyst with a data and SQL </b>background to join our team. The ideal candidate will have experience in gathering requirements, developing Business Requirement Documents (BRD), Functional Requirement Documents (FRD), and working closely with both business and technical teams. This role is not for a core Data Engineer, but for someone who has strong analytical skills with a good understanding of data concepts and SQL. <b>Experience in Insurance Domain is required.</b></p><p><b>Role & Responsibilities Overview:</b></p><p> Collaborate with stakeholders to gather and document business requirements.</p><p> Develop detailed BRDs and FRDs to support project initiatives.</p><p> Conduct data analysis and provide insights using SQL.</p><p> Work closely with technical teams to ensure the data requirements are clearly understood.</p><p> Assist in the design and validation of reports and data-driven solutions.</p><p> Translate business needs into functional specifications and ensure successful implementation.</p><p> Perform quality assurance to ensure alignment with requirements.</p><p> Ensure timely delivery of deliverables and milestones in line with project timelines.</p><p><b>Candidate Profile:</b></p><p> Bachelor's/Master's degree in economics, mathematics, computer <span class="long-word">science/engineering,</span> operations research or related analytics areas; candidates with BA/BS degrees in the same fields from the top tier academic institutions are also welcome to apply</p><p> Experience: 4-7 years of experience as a Business Analyst with exposure to the</p><p>Insurance Domain</p><p> Proficient in SQL and capable of performing complex queries for data analysis.</p><p> Strong understanding of databases, data management, and reporting.</p><p> Experience with BRD and FRD documentation.</p><p> Support project management activities by providing input on timelines, dependencies, and risks related to business requirements.</p><p> Good critical thinking and problem solving skills</p><p> Strong record of achievement, solid analytical ability, and an entrepreneurial hands-on approach to work</p><p> Outstanding written and verbal communication skills, and presentation skills</p><p> Able to work in fast pace continuously evolving environment and ready to take up uphill challenges</p><p> Is able to understand cross cultural differences and can work with clients across the globe</p><div></div></div></div>

<h3>Job Description</h3><div>Job Description<div><p>Job Summary:</p><p></p><p>We are seeking a strong Business Analyst with a data and SQL background to join our team. The ideal candidate will have experience in gathering requirements, developing Business Requirement Documents (BRD), Functional Requirement Documents (FRD), and working closely with both business and technical teams. This role is not for a core Data Engineer, but for someone who has strong analytical skills with a good understanding of data concepts and SQL. Experience in Insurance Domain is required.</p><p></p><p>Role & Responsibilities Overview:</p><p></p><p> Collaborate with stakeholders to gather and document business requirements.</p><p> Develop detailed BRDs and FRDs to support project initiatives.</p><p> Conduct data analysis and provide insights using SQL.</p><p> Work closely with technical teams to ensure the data requirements are clearly understood.</p><p> Assist in the design and validation of reports and data-driven solutions.</p><p> Translate business needs into functional specifications and ensure successful implementation.</p><p> Perform quality assurance to ensure alignment with requirements.</p><p> Ensure timely delivery of deliverables and milestones in line with project timelines.</p><p></p><p>Candidate Profile:</p><p> Bachelor's/Master's degree in economics, mathematics, computer <span class="long-word">science/engineering,</span> operations research or related analytics areas; candidates with BA/BS degrees in the same fields from the top tier academic institutions are also welcome to apply</p><p> Experience: 4-7 years of experience as a Business Analyst with exposure to the</p><p>Insurance Domain</p><p> Proficient in SQL and capable of performing complex queries for data analysis.</p><p> Strong understanding of databases, data management, and reporting.</p><p> Experience with BRD and FRD documentation.</p><p> Support project management activities by providing input on timelines, dependencies, and risks related to business requirements.</p><p> Good critical thinking and problem solving skills</p><p> Strong record of achievement, solid analytical ability, and an entrepreneurial hands-on approach to work</p><p> Outstanding written and verbal communication skills, and presentation skills</p><p> Able to work in fast pace continuously evolving environment and ready to take up uphill challenges</p><p> Is able to understand cross cultural differences and can work with clients across the globe<br><br> #L!-CEIPAL</p></div></div>

Zortech Solutions Interview Questions

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Zortech Solutions Interview Questions

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