取每组数据的第一条记录的SQL语句

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CREATE TABLE JobLog -- 操作日志表
(
    JobLogId] int NOT NULL ,       -- 主键
    FunctionId nvarchar(20) NULL , -- 功能Id
    OperateTime datetime NULL      -- 操作时间
) ON PRIMARY
GO
ALTER TABLE JobLog ADD
CONSTRAINT PK_JobLog PRIMARY KEY CLUSTERED(JobLogId) ON PRIMARY
GO

-- 操作日志表的所有记录
SELECT * FROM JobLog
查询结果：
1    001    2007-11-01
2    001    2007-11-02
3    001    2007-11-03
4    002    2007-11-04
5    002    2007-11-05
6    003    2007-11-06
7    004    2007-11-07
8    004    2007-11-08
9    005    2007-11-09
10 005    2007-11-10

-- 每个功能最后一次操作记录
SELECT * FROM JobLog A
WHERE JobLogId in
       (SELECT TOP 1 JobLogId FROM JobLog
         WHERE A.FunctionId = FunctionId ORDER BY OperateTime DESC
       )

--A.FunctionId = FunctionId 是你需要获取字段的
查询结果：
3    001    2007-11-03
5    002    2007-11-05
6    003    2007-11-06
8    004    2007-11-08
10 005    2007-11-10

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