select 字段,(case bh when 'bh001' then ys+1when 'bh002' then ys+3when 'bh003' then ys+5 else '' end)newcol from 表
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select 字段,(case bh when 'bh001' then ys+1when 'bh002' then ys+3when 'bh003' then ys+5 else '' end)newcol from 表