Average Time Spent In Progress

SQL practice question · Hard · Date & Time · Atlassian

Each row means the issue ENTERED status at changed_at and stayed there until its next row. Issues whose last status is still open are measured up to the snapshot time '2026-03-31 18:00:00'. An issue can enter 'In Progress' several times (time is summed) and the same status may be logged twice in a row. For each project return project, issues (number of issues that were ever 'In Progress') and avg_hours_in_progress (average per issue of total hours in 'In Progress', ROUND 2). Order by project.

Table: issue_status_log

Schema of issue_status_log
ColumnType
issue_keyTEXT
projectTEXT
statusTEXT
changed_atTIMESTAMP
Sample rows of issue_status_log
issue_keyprojectstatuschanged_at
JIRA-1PLATTo Do2026-03-02 09:00:00
JIRA-1PLATIn Progress2026-03-02 10:00:00
JIRA-1PLATDone2026-03-03 10:00:00
JIRA-2PLATIn Progress2026-03-04 09:00:00
JIRA-2PLATReview2026-03-04 15:00:00
JIRA-2PLATIn Progress2026-03-05 09:00:00
JIRA-2PLATDone2026-03-05 12:00:00
MOB-1MOBTo Do2026-03-10 09:00:00
Expected output on the sample data
projectissuesavg_hours_in_progress
MOB124
PLAT216.5

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