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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.

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

Input:

<code>big_table</code> table

<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

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

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

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?

Let’s say you work for a social media company that has just done a launch in a new city. Looking at weekly metrics, you see a slow decrease in the average number of comments per user from January to March in this city.

The company has been consistently growing new users in the city from January to March.

What are some reasons why the average number of comments per user would be decreasing and what metrics would you look into?

What metric could be used to measure if active users are still engaging on the platform despite an overall decrease in the average number of comments per user?

What metric could be used to measure if active users are still engaging on the platform despite an overall decrease in the average number of comments per user?

Decreasing Comments

How would you investigate a decline in the average number of comments per user?

Aptask Salaries by Position

About Client: The client is a global technology, consulting, and digital solutions company with problem-solving abilities and an emphasis on developing ingenious solutions that allow its clients to remain competitive, profitable, and secure in an evolving business environment.Client anticipates and leads change to remain in the leader's quadrant for profitable growth, driven by partnerships with globally leading hyperscales like AWS, Google Cloud, and Microsoft. It has built strong capabilities in new as well as existing technologies such as cloud, data, and digital, pioneering new frontiers.Salary Range: $120k-$140k/Annum + BenefitsJob Description: We are seeking a highly experienced Senior Business Analyst with over 10 years of experience in the capital markets and banking domain, specifically with deep expertise in Issuer Services and Debt Markets. The ideal candidate will have a strong background in business analysis within the financial sector, with a particular focus on debt instruments, corporate trust, and issuer services.Key Responsibilities: Conduct in-depth business analysis for capital markets projects, specifically in issuer services and debt products. Work closely with stakeholders to gather requirements, define scope, and ensure alignment with business goals. Document business requirements, functional specifications, and process flows. Collaborate with technology and business teams to ensure successful project delivery. Analyze market trends, regulations, and business needs to drive innovation and process improvements. Support project management activities, including timelines, risk management, and resource allocation.Qualifications: 10+ years of experience in business analysis, preferably in capital markets or investment banking. Extensive experience in Issuer Services and Debt Markets. Proven ability to manage complex business processes and translate them into technical solutions. Strong knowledge of financial regulations, market structures, and debt instruments. Excellent communication, problem-solving, and analytical skills. Ability to work in a fast-paced environment and manage multiple projects.About ApTask:ApTask is a leading global provider of workforce solutions and talent acquisition services, dedicated to shaping the future of work. As an African American-owned and Veteran-certified company, ApTask offers a comprehensive suite of services, including staffing and recruitment solutions, managed services, IT consulting, and project management. With a focus on excellence, collaboration, and innovation, ApTask provides unparalleled opportunities for professional growth and development. As a member of the ApTask team, you will have the chance to connect businesses with top-tier professionals, optimize workforce performance, and drive success across diverse industries. Join us at ApTask and be part of our mission to empower organizations to thrive while fostering a diverse and inclusive work environment.Applicants may be required to attend interviews in person or by video conference. In addition, candidates may be required to present their current state or government issued ID during each interview.Candidate Data Collection Disclaimer:At ApTask, we prioritize safeguarding your privacy. As part of our recruitment process, certain Personally Identifiable Information (PII) may be requested by our clients for verification and application purposes. Rest assured, we strictly adhere to confidentiality standards and comply with all relevant data protection laws. Please note that we only collect the necessary information as specified by each client and do not request sensitive details during the initial stages of recruitment.If you have any concerns or queries about your personal information, please feel free to contact our compliance team at businessexcellence@aptask.com .

About Client: The Client is a leading global IT services and consulting company, providing a wide range of services to clients in various industries, including banking, financial services, retail, manufacturing, healthcare, and more. It is one of the largest employers in the IT industry and has a vast and diverse workforce. The company places a strong emphasis on employee training and development. Client is known for its commitment to innovation and invests in research and development to stay at the forefront of technological advancements. It offers a comprehensive set of services, including: IT Services: Application development, maintenance, and testing. Consulting: Business consulting, IT strategy, and digital transformation. Business Process Outsourcing (BPO): Outsourcing of business processes to improve efficiency. Enterprise Solutions: Implementation and support of enterprise-level software solutions. Digital Services: Services related to digital technologies, such as analytics, cloud, and IoT. Rate Range: $110K-$135K/Annum Job Description: <ul> <li>8+ years of relevant experience as a Data Engineer</li> <li>Snowflake (mandatory and preferably certified) - Strong implementation experience with a good understanding of Snowflake Architecture being able to design and implement solutions and having good experience in Snowflake performance optimization techniques.</li> <li>Advanced SQL (mandatory and preferably certified) - Good understanding of the concept of Slowly Changing Dimensions (SCD), be able to write complex queries using Self Joins, Cursors also recursive, Views/Materialized, strong in PL/SQL etc.</li> <li>Strong experience in SQL Performance tuning especially when dealing with large datasets in millions of data.</li> <li>Understanding of Data semantics and data semantic models</li> <li>Python (mandatory) - Good experience in Python</li> <li>Expert in Singlestore procedure.</li> <li>Experience with Cloud Computing (AWS or Google Cloud) for deployment purposes is nice to have.</li></ul> About ApTask: ApTask is a leading global provider of workforce solutions and talent acquisition services, dedicated to shaping the future of work. As an African American-owned and Veteran-certified company, ApTask offers a comprehensive suite of services, including staffing and recruitment solutions, managed services, IT consulting, and project management. With a focus on excellence, collaboration, and innovation, ApTask provides unparalleled opportunities for professional growth and development. As a member of the ApTask team, you will have the chance to connect businesses with top-tier professionals, optimize workforce performance, and drive success across diverse industries. Join us at ApTask and be part of our mission to empower organizations to thrive while fostering a diverse and inclusive work environment. Applicants may be required to attend interviews in person or by video conference. In addition, candidates may be required to present their current state or government issued ID during each interview. Candidate Data Collection Disclaimer: At ApTask, we prioritize safeguarding your privacy. As part of our recruitment process, certain Personally Identifiable Information (PII) may be requested by our clients for verification and application purposes. Rest assured, we strictly adhere to confidentiality standards and comply with all relevant data protection laws. Please note that we only collect the necessary information as specified by each client and do not request sensitive details during the initial stages of recruitment. If you have any concerns or queries about your personal information, please feel free to contact our compliance team at businessexcellence@aptask.com .

About Client: The Client is a leading global IT services and consulting company, providing a wide range of services to clients in various industries, including banking, financial services, retail, manufacturing, healthcare, and more. It is one of the largest employers in the IT industry and has a vast and diverse workforce. The company places a strong emphasis on employee training and development. Client is known for its commitment to innovation and invests in research and development to stay at the forefront of technological advancements. It offers a comprehensive set of services, including: IT Services: Application development, maintenance, and testing. Consulting: Business consulting, IT strategy, and digital transformation. Business Process Outsourcing (BPO): Outsourcing of business processes to improve efficiency. Enterprise Solutions: Implementation and support of enterprise-level software solutions. Digital Services: Services related to digital technologies, such as analytics, cloud, and IoT. Rate Range: $70-$75/Hr Job Description: <ul> <li>The Core Banking Business Analyst will be responsible for analyzing and documenting business requirements for the development, enhancement, and support of core banking systems. </li> <li>This role involves working closely with stakeholders from various departments, understanding their needs, and translating them into technical requirements that align with the core banking platform.</li> <li>The ideal candidate will have strong knowledge of Retail banking operations, core banking systems, and experience in business analysis within the financial services industry.</li></ul>Experience:<ul> <li>18 to 20 years of experience in business analysis, with at least 8+ years working in the banking or financial services industry.</li> <li>Proven work experience in Core banking Transformation/Migration and Upgrade projects</li> <li>Proven work experience in Analysis of Legacy core banking systems and mapping Legacy products with new age core banking systems</li> <li>Solid experience with any of the core banking platforms such as Temenos, Finacle, FIS Products or Oracle FLEXCUBE.</li> <li>Knowledge of banking operations and processes, including retail banking, lending, payments, and customer onboarding.</li> <li>Familiarity with project management methodologies (Agile, Scrum, Waterfall).</li></ul>Technical Expertise: <ul> <li>Strong understanding of business analysis frameworks and best practices.</li> <li>Ability to create detailed business and functional documentation.</li> <li>Proficiency in tools such as Microsoft Excel, Visio, JIRA, and Confluence.</li></ul>Soft Skills: <ul> <li>Excellent communication and interpersonal skills, with the ability to interact with stakeholders at all levels.</li> <li>Strong analytical and problem-solving abilities.</li> <li>Ability to work independently and manage multiple priorities in a fast-paced environment.</li> <li>High attention to detail and organizational skills.</li></ul>Preferred Skills:<ul> <li>Experience with data migration projects and digital transformation initiatives.</li> <li>Knowledge of regulatory compliance in banking, such as PCI-DSS, KYC, and AML.</li> <li>Certification in business analysis (CBAP, PMI-PBA) or Agile methodologies (Scrum Master, Product Owner) is a plus.</li> <li>This role is ideal for a detail-oriented, analytically minded professional who enjoys bridging the gap between business needs and technical solutions in the banking industry.</li></ul> About ApTask: ApTask is a leading global provider of workforce solutions and talent acquisition services, dedicated to shaping the future of work. As an African American-owned and Veteran-certified company, ApTask offers a comprehensive suite of services, including staffing and recruitment solutions, managed services, IT consulting, and project management. With a focus on excellence, collaboration, and innovation, ApTask provides unparalleled opportunities for professional growth and development. As a member of the ApTask team, you will have the chance to connect businesses with top-tier professionals, optimize workforce performance, and drive success across diverse industries. Join us at ApTask and be part of our mission to empower organizations to thrive while fostering a diverse and inclusive work environment. Applicants may be required to attend interviews in person or by video conference. In addition, candidates may be required to present their current state or government issued ID during each interview. Candidate Data Collection Disclaimer: At ApTask, we prioritize safeguarding your privacy. As part of our recruitment process, certain Personally Identifiable Information (PII) may be requested by our clients for verification and application purposes. Rest assured, we strictly adhere to confidentiality standards and comply with all relevant data protection laws. Please note that we only collect the necessary information as specified by each client and do not request sensitive details during the initial stages of recruitment. If you have any concerns or queries about your personal information, please feel free to contact our compliance team at businessexcellence@aptask.com

About Client: The client is a global consulting, technology, and digital firm specializing in the financial services industry. Established in 2001, the company provides innovative solutions to help clients navigate digital transformation, enhance operational efficiency, and achieve strategic objectives. With a focus on banking, capital markets, and insurance, it leverages cutting-edge technologies such as blockchain, artificial intelligence, and data science to deliver customized IT solutions and business consulting services. The company's commitment to innovation, combined with its industry expertise, positions it as a leader in driving technological advancements and helping financial institutions stay competitive in a rapidly evolving market. Salary Range: $70K-$80K/Annum Job Description: <ul> <li>Acquiring, analysing, and documenting an expert's project requirements.</li> <li>Constructing an original model from an expert's project requirements.</li> <li>Use statistical analysis to optimize product workflows</li> <li>Collaborating with experts, guiding them through the process.</li> <li>Strategically planning, developing and packaging the expert's product.</li></ul>Requirements:<ul> <li>Bachelor's Degree in Statistics, Master's is preferred.</li> <li>Strong analytical, problem-solving skills</li> <li>Desire and ability to learn</li> <li>Motivation</li> <li>Team Work</li></ul> About ApTask: ApTask is a leading global provider of workforce solutions and talent acquisition services, dedicated to shaping the future of work. As an African American-owned and Veteran-certified company, ApTask offers a comprehensive suite of services, including staffing and recruitment solutions, managed services, IT consulting, and project management. With a focus on excellence, collaboration, and innovation, ApTask provides unparalleled opportunities for professional growth and development. As a member of the ApTask team, you will have the chance to connect businesses with top-tier professionals, optimize workforce performance, and drive success across diverse industries. Join us at ApTask and be part of our mission to empower organizations to thrive while fostering a diverse and inclusive work environment. Applicants may be required to attend interviews in person or by video conference. In addition, candidates may be required to present their current state or government issued ID during each interview. Candidate Data Collection Disclaimer: At ApTask, we prioritize safeguarding your privacy. As part of our recruitment process, certain Personally Identifiable Information (PII) may be requested by our clients for verification and application purposes. Rest assured, we strictly adhere to confidentiality standards and comply with all relevant data protection laws. Please note that we only collect the necessary information as specified by each client and do not request sensitive details during the initial stages of recruitment. If you have any concerns or queries about your personal information, please feel free to contact our compliance team at businessexcellence@aptask.com .

About Client: The Client is a leading global IT services and consulting company, providing a wide range of services to clients in various industries, including banking, financial services, retail, manufacturing, healthcare, and more. It is one of the largest employers in the IT industry and has a vast and diverse workforce. The company places a strong emphasis on employee training and development. Client is known for its commitment to innovation and invests in research and development to stay at the forefront of technological advancements. It offers a comprehensive set of services, including: IT Services: Application development, maintenance, and testing. Consulting: Business consulting, IT strategy, and digital transformation. Business Process Outsourcing (BPO): Outsourcing of business processes to improve efficiency. Enterprise Solutions: Implementation and support of enterprise-level software solutions. Digital Services: Services related to digital technologies, such as analytics, cloud, and IoT. Salary Range: Job Description: <ul> <li>We are in search of an insurance domain consultant with extensive experience in the Commercial lines Insurance space. </li> <li>As a domain expert, the associate is expected to act as a liaison between the Business stakeholders, Product Owner , IT stakeholders and Agile teams effectively collaborating to drive results. </li> <li>The primary responsibility from this role is to elicit, analyze, document ,validate and communicate requirements for successful implementation of customer's transformation initiatives.A profound understanding of the commercial lines policy administration, claims, bureau rating, and pricing methods etc. is vital for effective communication with stakeholders. </li> <li>Proficiency in Policy life cycle (i.e., Quoting, Issuance ,Premium development, and Claims handling) within the P&C domain is essential, along with comprehensive knowledge on various products across the line of business, including : </li> <li>Business Owners Policy </li> <li>Workers Compensation </li> <li>General and Professional Liability </li> <li>Commercial Auto </li> <li>Property and Marine </li> <li>Umbrella </li></ul>Primary Responsibilities: <ul> <li>Possesses strong functional knowledge and applies necessary elicitation techniques to draw out data and analytics business requirements completely and accurately from stakeholders. </li> <li>Perform Data profiling and exploratory analysis using standard tools to understand data patterns ,relationships and anomalies in the data . </li> <li>Recommend requirement solution options and define business transformation rules to integrate, translate data in accordance with business usage requirements. </li> <li>Perform Data Reconciliation and root cause analysis to ensure integrity and accuracy of data at the individual levels (e.g. policy, line of business, state, segment) and aggregate level . </li> <li>Prepare Requirement Traceability Matrix and Data mapping documents in a defined template to track functional requirements</li></ul> About ApTask: ApTask is a leading global provider of workforce solutions and talent acquisition services, dedicated to shaping the future of work. As an African American-owned and Veteran-certified company, ApTask offers a comprehensive suite of services, including staffing and recruitment solutions, managed services, IT consulting, and project management. With a focus on excellence, collaboration, and innovation, ApTask provides unparalleled opportunities for professional growth and development. As a member of the ApTask team, you will have the chance to connect businesses with top-tier professionals, optimize workforce performance, and drive success across diverse industries. Join us at ApTask and be part of our mission to empower organizations to thrive while fostering a diverse and inclusive work environment. Applicants may be required to attend interviews in person or by video conference. In addition, candidates may be required to present their current state or government issued ID during each interview. Candidate Data Collection Disclaimer: At ApTask, we prioritize safeguarding your privacy. As part of our recruitment process, certain Personally Identifiable Information (PII) may be requested by our clients for verification and application purposes. Rest assured, we strictly adhere to confidentiality standards and comply with all relevant data protection laws. Please note that we only collect the necessary information as specified by each client and do not request sensitive details during the initial stages of recruitment. If you have any concerns or queries about your personal information, please feel free to contact our compliance team at businessexcellence@aptask.com

About Client: Client is a company that helps other businesses use technology to improve and grow. They provide services like creating computer programs, managing computer systems, and making sure everything is secure. Client works with different industries like telecommunications, healthcare, banking, and retail to help them use new and exciting technologies like artificial intelligence, cloud computing, and the Internet of Things. These technologies can make businesses more efficient and innovative. They have offices and people working all around the world, and their team of experts helps businesses solve their technology challenges. Client also cares about making a positive impact on society and the environment, so they support social causes and work to conserve resources. Salary Range: $110K-$115K/Annum Job Description: <ul> <li>Have hands-on knowledge of Spark (Scala preferred), Hadoop, Kafka etc</li> <li>Develop batch and streaming solutions using various Big Data technology.</li> <li>Have strong programming knowledge in Java, Scala, or Python.</li> <li>Have experience working with real-time or near real-time ingestion.</li> <li>Experience on Streaming tool like nifi is added advantage.</li> <li>Be familiar with Agile/Scrum methodologies.</li></ul> About ApTask: ApTask is a leading global provider of workforce solutions and talent acquisition services, dedicated to shaping the future of work. As an African American-owned and Veteran-certified company, ApTask offers a comprehensive suite of services, including staffing and recruitment solutions, managed services, IT consulting, and project management. With a focus on excellence, collaboration, and innovation, ApTask provides unparalleled opportunities for professional growth and development. As a member of the ApTask team, you will have the chance to connect businesses with top-tier professionals, optimize workforce performance, and drive success across diverse industries. Join us at ApTask and be part of our mission to empower organizations to thrive while fostering a diverse and inclusive work environment. Applicants may be required to attend interviews in person or by video conference. In addition, candidates may be required to present their current state or government issued ID during each interview. Candidate Data Collection Disclaimer: At ApTask, we prioritize safeguarding your privacy. As part of our recruitment process, certain Personally Identifiable Information (PII) may be requested by our clients for verification and application purposes. Rest assured, we strictly adhere to confidentiality standards and comply with all relevant data protection laws. Please note that we only collect the necessary information as specified by each client and do not request sensitive details during the initial stages of recruitment. If you have any concerns or queries about your personal information, please feel free to contact our compliance team at businessexcellence@aptask.com .

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