select*from ‘ * ’ 的意义?如题.还有一个问题,,有一个数据库文件xuesheng3select ```````from xuesheng3!xs inner join xuesheng3!cjxs 是通过数据库建立的表文件,cj 是数据库里的一个表文件.请问 那个感叹号的

ms sql :select * from (select *from b) as xxx where 和 select * from (select *from b) xxx where区select * from (select *from b) as xxx where…… 和 select * from (select *from b) xxx where……的区别别告诉我是一样的.因为我有一 select * from book limit , 数据库中select into from 和 insert into select的区别 Select all cus_name city from customer; Select all cus_name,city from customer; 有何不同?Select all cus_name city from customer; Select all cus_name,city from customer;这两条语句查询的结果为什么不一样?第二句的逗号有什么 insert into a select * from b 和select * into a from b 这两个语句是不是一样的? select Customer from(SELECT CustomerName AS Customer FROM Customers) cus;请问这里的cus起什么作用 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? 这句SQL语句是什么意思.ql=select distinct(selabel) from.sql=select distinct(selabel) from kcwl_labprosellog where isdel=0 &sqlfile& and selabel not in (select distinct(selabel) from kcwl_labprosell) 这个语句是什么作用的.说具 我有一个这样的语句select * from wspriv_adminlog tt where tt.worker_id in(select t1.worker_id from wspriv_worker t1 where t1.deptid in(select t2.deptid from wspriv_dept t2 where t2.path like '/9/58/%')) ; 1' union select * from [ADM] union select * SELECT MAX(account) AS account FROM shop 和 SELECT MAX(account) FROM shop 的区别?shop 是表名,article 是表中的一个字段名. select * from a,b与select * from a inner join b 的取数方式和执行效率有什么不同, select count(c) from (select b from TUserBankLogSum b group by b.tid) as c 这条hql是错的按照这个意思应该怎么写