# View Query Diff

Source: https://userguide.qualytics.io/container/computed-join/how-tos/view-query-diff/

This page walks through opening the changes dialog from the **Timeline** section on a Computed Join's Overview tab. For the concept behind change tracking (what is captured, how the diff is computed, single-pane fallback), see [Query Diff](https://userguide.qualytics.io/container/computed-join/deep-dive/query-diff/).

> **Info: Permissions**
>
> Any user with at least the **Reporter** team permission on the parent datastore can view the Timeline section and open the changes dialog. See [Computed Join Permissions](https://userguide.qualytics.io/container/computed-join/deep-dive/permissions/) for the full matrix.

## Steps

**Step 1:** Open the Computed Join. The **Overview** tab is selected by default.

![Computed Join detail page with the Overview tab active](https://userguide.qualytics.io/assets/container/computed-join/how-tos/view-query-diff/step-1-computed-join-overview.png)

**Step 2:** Scroll to the **Timeline** section on the Overview tab. The Timeline mixes the revisions of the Computed Join with the comments your team has left on it.

![Timeline section showing recent revisions](https://userguide.qualytics.io/assets/container/computed-join/how-tos/view-query-diff/step-2-timeline-section.png)

**Step 3:** Locate a revision that changed a tracked SQL field and click the **View changes**  control below it. The control reports the size of the change (for example, `176 → 298 chars`). In pairwise mode the tracked fields are the **Select Clause**, **Where Clause**, and **Group By Clause**; in SQL mode it is the **Query**.

![Timeline entry with the View changes control highlighted](https://userguide.qualytics.io/assets/container/computed-join/how-tos/view-query-diff/step-3-view-changes-control.png)

**Step 4:** Review the comparison dialog:

- The **From** pane shows the previous value, with removed lines highlighted.
- The **To** pane shows the new value, with added lines highlighted.
- Both panes are aligned line for line and share a single scrollbar, so the same region stays in view on both sides, and identical stretches are collapsed so the differences come first.
- Each pane header has a copy button for lifting that version out of the dialog.
- The first time a value is recorded there is nothing to compare against, so a single pane headed **Initial** appears instead of the two.
- The footer shows **Updated by {user}** followed by the timestamp of the change.

![Changes dialog showing the From and To panes](https://userguide.qualytics.io/assets/container/computed-join/how-tos/view-query-diff/step-4-clause-changes-dialog.png)

For the full list of tracked fields, what is captured as plain text on the Timeline, the diff behavior, and the single-pane fallback for first-time-set clauses, see [Query Diff](https://userguide.qualytics.io/container/computed-join/deep-dive/query-diff/).

*Last updated: August 14, 2026.*