SELECT a.*, bp.praes AS praes_name, bt.thema AS thema_name, kt.tag AS tag, st.uhrzeit AS uhrzeit FROM slots a, band_praes bp, band_themen bt LEFT JOIN slots_tage st ON st.kongress_id = ? AND st.slot = a.slot LEFT JOIN kongress_tage kt ON kt.id = st.tag_id WHERE bp.id = a.praes AND bt.id = a.thema AND a.kongress_id IN (?,?) AND a.rolle = ? AND a.slot = ? AND a.room = ?<br />
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