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select a.*,c.* from (
select * from news where node like '|2|%'
) a
left join news b on b.isdel_id=a.isdel_id
inner join class c on c.class_id=a.class_id
where a.class_id=2 && a.isdel=0
select a.*,c.* from news a
left join (
select * from news where node like '|2|%'
) b on a.class_id=b.class_id
left join class c on a.class_id=c.class_id
where a.class_id=2 && a.isdel=0