Overview | Workflow Example 1 | Workflow Example 2

Verifying if dt is uniquely identified | Possible unique identifiers | Verifying if data table is balanced | Tabulating simple frequencies

Examples | Simple merge | Going further

Overview | Rationale | Some examples | 1. Left join | 2. Right join | 3. Full join | 4. Inner join

Overview | Information messages ℹ | Timing messages 🔵 | Warning messages ⚠️ | Error messages ❌ | Additional: How to visualize joyn messages?

Advanced use | 1. Use variable country as one of the key variables | 2. Ignore the values of country from y and don't bring it into the resulting table | 3. Update only NAs in table x | 4. Update actual values in table x | 5. Keep original country variable from y into returning table | (Keep matching-names variable from y into x -not updating values in x) | Bring other variables from y into returning table

Overview | General use | The basics | Reporting variable | Key variables | Match type | Type of join | An important feature: JOYn report and info display