# Combining Data

Coupler.io allows you to fetch data from several sources at the same time

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-cover data-type="image">Cover image</th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>Join data</strong></td><td><em>all the elements from the left set are kept while only matching elements from the right set are included</em></td><td><a href="https://2487187314-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FCgnmco7kCnvytNIN8YdT%2Fuploads%2F0fomNdyKmn7nvMWvwHIJ%2FScreenshot%202026-02-17%20at%2012.41.23.png?alt=media&#x26;token=22385e43-f5c9-497d-ad0d-4f33609305c4">Screenshot 2026-02-17 at 12.41.23.png</a></td><td><a href="combining-data/join-data">join-data</a></td></tr><tr><td><strong>Append data</strong></td><td><em>merging values for the same data attribute from two or more data sets and placing them under the same column(s) in the destination file.</em> </td><td><a href="https://2487187314-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FCgnmco7kCnvytNIN8YdT%2Fuploads%2FllzmZUSG9FTgwIX5lkQ6%2FScreenshot%202026-02-17%20at%2012.44.08.png?alt=media&#x26;token=4780b931-cd34-45e1-ad6c-e122aa1ce3b6">Screenshot 2026-02-17 at 12.44.08.png</a></td><td><a href="combining-data/append-data">append-data</a></td></tr><tr><td><strong>Aggregate data</strong></td><td><em>summarizing and revealing key insights of your data by performing operations like sum, average, count, min, or max on specific columns and consolidating the results in the destination file</em></td><td><a href="https://2487187314-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FCgnmco7kCnvytNIN8YdT%2Fuploads%2FMN5WdIEfQGA6Zm5JExht%2FScreenshot%202026-02-17%20at%2012.44.41.png?alt=media&#x26;token=a1f32261-a409-4506-a9d2-6bb4c0cd72d4">Screenshot 2026-02-17 at 12.44.41.png</a></td><td><a href="combining-data/aggregate-data">aggregate-data</a></td></tr></tbody></table>