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- SELECT SUM(count) FROM
- (SELECT preukaz.cislo_preukazu, count(*)
- FROM preukaz
- JOIN pozicane_knihy ON preukaz.preukaz_id = pozicane_knihy.preukaz_id
- JOIN citatel ON preukaz.citatel_id = citatel.citatel_id
- GROUP BY preukaz.cislo_preukazu) x
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