1
我有2个类似的查询OPENQUERY给出不同的结果
select *
from openquery(powerschool,
'select *
from TEACHERS
where teachernumber is not null
and schoolid=''1050''
and teacherloginid is not null
order by teachernumber')
和
SELECT *
from openquery(powerschool,
'SELECT NVL(teachernumber,'''')
from TEACHERS
where teachernumber is not null
and schoolid=''1050''
and teacherloginid is not null
order by teachernumber')
第一个是给我182行,而第二个给了我83
这有什么错查询?
是SELECT子句前未评估WHERE子句...又名NVL之后“teachernumber不为空” – gbn 2009-08-05 04:18:25