会报错
直接在sql里面取前20就可以
mssql:select top 20 * from 表 order by zje
mysql:select * from 表 order by zje limit 20
Oracle:select * from (select * from 表 order by zje) where rownum<=20 order by rownum asc
用 limit 4
帆软内置数据库用limit 4
oracle用rownum
select * from 订单 limit 3
换成select * from 订单 limit 4