帮忙看一条sql 多谢了

帮忙看一条sql 谢谢了
select currentYear

from yyxt.dbo.t_d_Yield_SoilSurvey where currentYear 

between (select min(currentYear) from yyxt.dbo.t_d_Yield_SoilSurvey) 

and ((select min(currentYear) from yyxt.dbo.t_d_Yield_SoilSurvey)+4)


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这条语句在sqlServer上运行都可以
因为现在要改成sybase数据库
所以就报错了 主要是+4这里出错了 sybase说 不允许从varchar到int的转换
如果我把4换成'4' 结果就是： 比如currentYear='2009'的话 结果就是20094

我都不知道怎么办呢
别人说用CAST(min(currentYear) AS INT) + 1可以 但是好像不适合我这条语句


------解决方案--------------------

SQL code

select currentYear
from yyxt.dbo.t_d_Yield_SoilSurvey  
where CAST(currentYear AS INT) 
between (select CAST(min(currentYear) AS INT) from yyxt.dbo.t_d_Yield_SoilSurvey) 
and ((select CAST(min(currentYear) AS INT)+4 from  yyxt.dbo.t_d_Yield_SoilSurvey))