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feat: adds mercedesmathews.sql script #636

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feat: adds mercedesmathews.sql script #636

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26 changes: 26 additions & 0 deletions lesson_28/db/db_app/src/main/resources/queries/mercedesmathews.sql
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Original file line number Diff line number Diff line change
@@ -0,0 +1,26 @@
SELECT
type,
COUNT(*) AS total
FROM
media_items
GROUP BY
type


SELECT
SUM(pages) AS total_pages_checked
FROM
checked_out_items a
JOIN media_items b ON b.id = a.item_id


SELECT
g.email,
g.name,
GROUP_CONCAT(c.item_id) AS checked_out_items
FROM
guests g
LEFT JOIN
checked_out_items c ON g.email = c.email
GROUP BY
g.email, g.name, g.type;