spring中select * from student,和select * from [数据库名].[dbo].[student],怎么别人用前者可以,我不能

spring中select * from student,和select * from [数据库名].[dbo].[student],怎么别人用前者可以,我不能 数据库中select into from 和 insert into select的区别 select * from book limit , select * from a union select * from b 能详细说下么 select from 表 和select from [表]有什么不同? select count(*) from 怎么使用 select count(1) from emp select * into dept2 from dept select count(*) from table1 select count(*) from table2 select count(*) from table3我从table1 table2 table3 中 找数据的条数怎样一下子用一条sql语句 算出TABLE1 TABLE2 TABLE3 记录的总和? select * from book where 1=1这个条件语句中1=1是什么意思? sql语句中!例如SELECT STUDENT.学号,student.姓名from sdb!student oracle 中见到一个查询语句,select /*+ index(t1) */ from t1 .,其中/*+ select ename from emp where ename like'%A___'; 这条SQL语句中'%A___'是什么意思? $query = mysql_query( select * from 表名 where id='$_GET[id]' )中'$_GET[id]'是什么意思? 1' union select * from [ADM] union select * ansys中 select nodes VF 中SELECT 2 SQL语句理解 select * from B where (select count(1) as num from A where A.ID = B.ID) = 0select * from B where (select count(1) as num from A where A.ID = B.ID) = 0请问如何理解,为什么 可以在B表中 排除A表的数据