请教：如何查询每年中最小的10条记录？

[lishnqing]

如题，有很多年的数据，按日期顺序排列，假如要查询的字段为A，如何把每年中最小的10条记录找出来？

[lishnqing]

谢谢各位，我回去试试

[lxq19851204]

Select * From T1 A join (
Select year(transtime) as Year1,
SUBSTRING_INDEX(cast(group_concat(Transtime) as char),',',10) as str
 from (
Select * from t1 order by transtime)T group by year(TransTime))H
on year(A.transtime)=H.year1 and
INSTR(H.str,A.Transtime)<>0

[ACMAIN_CHM]

参考下贴中的多种方法 http://blog.csdn.net/acmain_chm/article/details/4126306 [征集]分组取最大N条记录方法征集，及散分....

[道玄希言]

SELECT T.* 
FROM
(
  SELECT t1.*,
  (
    SELECT COUNT(*)+1 FROM tbl 
    WHERE dt<t1.dt AND YEAR(dt)=YEAR(t1.dt)
  ) AS g_id
  FROM tbl t1
) T
WHERE T.g_id<=10
ORDER BY dt