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SELECT id FROM lockers AS l WHERE NOT EXISTS = (SELECT 1 FROM units AS u WHERE u.locker = l.id)
#!/usr/bin/perl use warnings; ... } unlink $dbfile;
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord }map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,