删除SQL Server数据中指定的重复记录
delete from 表 where 主键=(select top 1 主键 from 表 where 相同字段=(select 相同字段 from 表 group by 相同字段 having count(*)1)) 主键是表中绝对没有重复值的字段，如自动增量ID; 相同字段如采集时间，删除表中采集时间相同的记录 本语句，每执行一
delete from 表 where 主键=(select top 1 主键 from 表 where 相同字段=(select 相同字段 from 表 group by 相同字段 having count(*)>1))
主键是表中绝对没有重复值的字段，如自动增量ID;
相同字段如“采集时间”，删除表中采集时间相同的记录
本语句，每执行一次，只能删除一条重复记录，如果有三条记录有相同“采集时间”，，就要循环执行该语句两次。
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