SQL Full Outer Join
Let's explore FULL OUTER JOIN: it does joining for a union of records of table1 and table2:
All uncompleted fields got the value NULL.
Aufgabe
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For each singer, find the most expensive (price) song and the newest (year) album. Use FULL OUTER JOIN to see what's the result is. You should show singers.naming, songs.price with price alias, and albums.year with year alias values.
Lösung
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SELECT singers.naming, MAX(albums.year) AS year, MAX(songs.price) AS price
FROM songs
FULL OUTER JOIN singers ON songs.singer_id=singers.id
FULL OUTER JOIN albums ON songs.album_id=albums.id
GROUP BY singers.id
War alles klar?
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Abschnitt 2. Kapitel 4
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SELECT singers._ _ _
FROM songs
_ _ _ singers _ _ _
_ _ _ albums _ _ _
GROUP BY _ _ _
Query Result| No query executed yet... |
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