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id c1 c2 c4
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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