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feat: add SGL #642

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feat: add SGL #642

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lesson 28
jxwatson251 May 9, 2025
17db595
Merge branch 'lesson_28' of https://github.com/jxwatson251/code-diffe…
jxwatson251 May 9, 2025
f103d76
Merge branch 'code-differently:main' into lesson_28
jxwatson251 Jun 5, 2025
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14 changes: 14 additions & 0 deletions lesson_28/db/db_app/src/main/resources/queries/jasonwatson.sql
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-- 1. Count of media items by type
SELECT type, COUNT(*) AS count
FROM media_items
GROUP BY type;

-- 2. Sum of total pages checked out by guests
SELECT SUM(mi.page_count) AS total_pages_checked_out
FROM checked_out_items coi
JOIN media_items mi ON coi.media_item_id = mi.id;

-- 3. Show all guests and any corresponding checked out items
SELECT g.*, coi.*
FROM guests g
LEFT JOIN checked_out_items coi ON g.id = coi.guest_id;