请问该怎么写查询语句
如果表 A 字段id 字段class
表 B 字段NumberID 字段class
A的class对应B的NumberID
已知A的ID ,查询 B的class
------解决方案--------------------将记录及正确结果贴出来
TRY
SELECT * FROM A INNER JOIN B ON A.CLASS=B.NUMBER WHERE A.ID=[你的条件]
------解决方案-------------------- select b.class
from a inner join b on a.class=b.NumberID
where a.id=100
------解决方案--------------------不谈效率的话还可用in
select class
from b
where NumberID in (select class from a where id=100)