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  1  2  3  4
  2  3  3  20
  3  4  a  40

select ³öÀ´µÄ¼Ç¼ µÚ4Áиù¾ÝÖµµÄ·ÃÎÊÏÔʾһ¸öÖÐÎÄ  10һϵÄÏÔʾ µÍ  30һϵÄÏÔʾÖÐ 40ÒÔÉϵÄÏÔʾ¸ß
SQL code:
select
id,
c1,
c2,
case
when c4<10 then 'µÍ'
when c4>=10 and c4<30 then 'ÖÐ'
when c4>40 then '¸ß'
end as c4
from
tb

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