GCP Looker LookML Developer

A Looker LookML Developer works with datasets and LookML and is familiar with SQL and BI tools. LookML Developers are proficient in model management, including troubleshooting existing model errors, implementing data security requirements, creating LookML objects, and maintaining LookML project health. LookML Developers design new LookML dimensions and measures and build Explores for users to answer business questions. LookML developers are skilled at quality management, from implementing version control to assessing code quality to utilizing SQL runner for data validation.

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The Looker LookML Developer exam assessed one’s ability to:

  • Maintain and debug LookML code
  • Build user-friendly Explores
  • Design robust models
  • Define caching policies
  • Understand various datasets and associated schemas
  • Use Looker tools such as Looker IDE, SQL Runner, & LookML Validator

Course content

 

Model management

 

Troubleshoot errors in existing data models.
  • Determine error sources
  • Apply procedural concepts to resolve errors
Apply procedural concepts to implement data security requirements.
  • Implement permissions for users
  • Decide which Looker features to use to implement data security (e.g., access filters, field-level access controls, row-level access controls)
Analyze data models and business requirements to create LookML objects.
  • Determine which views and tables to use
  • Determine how to join views into Explores
  • Build project-based needs (e.g., data sources, replication, mock reports provided by clients)
Maintain the health of LookML projects in a given scenario.
  • Ensure existing contents are working (e.g., use Content Validator, audit, search for errors)
  • Resolve errors

 

Customization

 

 

Design new LookML dimensions or measures with given requirements.
  • Translate business requirements (specific metrics) into the appropriate LookML structures (e.g., dimensions, measures, and derived tables)
  • Modify existing project structure to account for new reporting needs
  • Construct SQL statements to use with new dimensions and measures
Build Explores for users to answer business questions.
  • Analyze business requirements and determine LookML code implementation to meet requirements (e.g., models, views, join structures)
  • Determine which additional features to use to refine data (e.g., sql_always_where, always_filter, only showing certain fields using hidden: fields:, etc.)

 

Optimization

 

 

Apply procedural concepts to optimize queries and reports for performance.
  • Determine which solution to use based on performance implications (e.g., Explores, merged results, derived tables)
  • Apply procedural concepts to evaluate the performance of queries and reports
  • Determine which methodology to use based on the query and reports performance sources (e.g., A/B testing, SQL principles)
Apply procedural concepts to implement persistent derived tables and caching policies based on requirements.
  • Determine appropriate caching settings based on data warehouse’s update frequency (e.g., hourly, weekly, based on ETL completion)
  • Determine when to use persistent derived tables based on runtime and complexity of Explore queries, and on users’ needs
  • Determine appropriate solutions for improving data availability (e.g., caching query data, persisting tables, combination solutions)

 

Quality

 

 

Implement version control based on given requirements.
  • Determine appropriate setup for Git branches (e.g., shared branches, pull from remote production)
  • Reconcile merge conflicts with other developer branches (e.g., manage multiple users)
  • Validate the pull request process
Assess code quality.
  • Resolve validation errors and warnings
  • Utilize features to increase usability (e.g., descriptions, labels, group labels)
  • Use appropriate coding for project files (e.g., one view per file)
Utilize SQL Runner for data validation in a given scenario.
  • Determine why specific queries return results by looking at the generated SQL in SQL Runner
  • Resolve inconsistencies found in the system or analysis (e.g., different results than expected, non-unique primary keys)
  • Optimize SQLs for cost or efficiency based on business requirements

 

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Course Prerequisites

  None

Who can attend

 
  • Business Users who need to draw insights from data. Data Analysts who are responsible for data analysis and visualization within their organizations.

Number of Hours: 30hrs

Certification

Looker LookML Developer

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  • Preparing for Certification

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