informix中怎样用sql语句删除前n条记录？
之前已经对表数据按begintime字段排序。
select first 100 * from TableName order by begintime;
然后再执行删除操作,将前100条记录删除。
delete first 100 * from alarmhis order by begintime;
但执行错误！该怎样写这个语句？



[解决办法]
由于informix的first选项限制较多，不能用在子查询，也不能用在into temp的select语句中，感觉一个sql写不出来。

用下面的select语句生成一堆delete语句，然后再跑这些delete语句：

select first 100 'delete from TableName where rowid='|| rowid ||';' from TableName order by begintime;

[解决办法]
delete TableName
where 某字段 in (select first 100 * from TableName order by begintime)试试