select * from ( select t.data maxdata, datatime,s.xlmc,ROW_NUMBER() OVER (PARTITION BY s.xlmc ORDER BY datatime) AS rn
from HISTORY_FH_ONEDAY t, =CURRENT_FH_XL s
where t.code = s.code ) c where c.rn=1
select * from ( select t.data maxdata, datatime,s.xlmc,ROW_NUMBER() OVER (PARTITION BY s.xlmc ORDER BY datatime) AS rn
from HISTORY_FH_ONEDAY t, =CURRENT_FH_XL s
where t.code = s.code ) c where c.rn=1
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