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select empid ,max([datetime]) maxrecdate,min([datetime] ) minrecdate
from 表1 group by empid
select empid ,min(recdate) minrecdate,max(recdate) maxrecdate from tb group by empid,
convert(varchar(10),recdate,120)
SELECT
empid,
MIN(recdate) AS minrecdate,
MAX(recdate) AS maxrecdate
FROM 表1
GROUP BY
empid,
CONVERT(VARCHAR(10),recdate,120)
select empid,convert(char(10),recdate,120) as d,
min(right(convert(char(19),recdate,120),8)) as mindate,
max(right(convert(char(19),recdate,120),8)) as maxdate
from ta
group by empid,convert(char(10),recdate,120)
order by 1,2
select empid ,min(recdate)minrecdate,max(recdate)maxrecdate from tb group by empid,convert(varchar(10),recdate,120)