 | Periscope Data Presents: A SQL-Based Approach to Cohort Retention and Analysis.: Learn how to use SQL to maintain and analyze your cohorts to improve your marketing, refine your user experience, and ensure your products and services are meeting customer needs. |  | Periscope Data Presents: Speed Up Your SQL: Periscope Data demonstrates the best ways to speed up your SQL queries with proven techniques they use themselves. |  | Stop Losing Customers - Periscope Data SQL Tips: Periscope Data explains the easiest way to use SQL to calculate cohort retention metrics. You\'ll learn how to quickly understand your customer performance using SQL queries to discover insights. |