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a 1 ¹¤³Ìʦ 3000 Èí¼þ²¿
b 2 ÆÕͨԱ¹¤ 2000 Ó²¼þ²¿
c 3 ¹¤³Ìʦ  4000  Ó²¼þ²¿
d 4  ÆäËû   1500  °ì¹«ÊÒ
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SQL code: 
select ÐÕÃû,
       ÈËÔ±±àºÅ,
       ְλ,
       н×Ê=(case when ְλ='¹¤³Ìʦ' then н×Ê*1.2 
                 when ְλ='ÆÕͨԱ¹¤' then н×Ê*1.05 else н×Ê end),
       н×Ê as [н×Ê(µ÷Õûǰ)]
from emp  
SQL code: 
select t.* , case  ְλ when '¹¤³Ìʦ' then н×Ê * 1.2 when 'ÆÕͨԱ¹¤' н×Ê * 1.1 else н×Ê * 1.05 end ¼Óнºó from emp t
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SQL code
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