select sum(decode(level,1,1,0)) as level1,sum(decode(level,2,1,0)) as level2 ,sum(decode(level,3,1,0)) as level3,sum(decode(level,3,1,0)) as level4,sum(decode(level,5,1,0)) as level5 from tb1 group by 类别
select sum(decode(level,1,1,0)) as level1,sum(decode(level,2,1,0)) as level2 ,sum(decode(level,3,1,0)) as level3,sum(decode(level,3,1,0)) as level4,sum(decode(level,5,1,0)) as level5 from tb1 group by 类别
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