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UPDATE abc_mp3_songs a SET a.anzahl_mp3 = (
select count(b.*)
from abc_mp3_songs b
where a.album_id = b.album_id
)
MySQL meldet: Dokumentation
#1064 - Fehler in der SQL-Syntax. Bitte die korrekte Syntax im Handbuch nachschlagen bei '*)
from abc_mp3_songs b
where a.album_id = b.album_id
)' in Zeile 2