区别相似查询语名?
1、sele a.* from dba01-100531 a,x6-yjjh b where a.jh=b.jh2、sele * from dba01-100531 where dba01-100531.jh=x6-yjjh.jh
3、sele * from dba01-100531,x6-yjjh where dba01-100531.jh=x6-yjjh.jh
4、sele dba01-100531.* from dba01-100531 where dba01-100531.jh=x6-yjjh.jh
5、sele dba01-100531.* from dba01-100531,x6-yjjh where dba01-100531.jh=x6-yjjh.jh
结果是1正确,其余都错误
这几行语句到底有什么区别?
谢谢大家了......
20100604958.rar
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[ 本帖最后由 snail5007 于 2010-6-12 09:12 编辑 ]