SQL
x
use tewiki_p;
SELECT rev1.rev_actor,@rev_len1:=rev1.rev_len, @parent:=rev_parent_id
from revision as rev1
where rev_page=27889;
select @rev_len2:=rev_len from revision where rev_id=@parent and rev_page=27889;
select @revision_length:=@rev_len1-@rev_len2
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