标幺值的优点（   ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69463' and id < 4498567 and id<>'4498567' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69463' and id > 4498567 and id<>'4498567' order by id asc limit 5