select * from book limit ,

select * from book limit , select * from book where 1=1这个条件语句中1=1是什么意思? 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 1' union select * from [ADM] union select * last friday.l b_a book from the city library. thlast friday.l b_a book from the city library. the assistant said l could last friday.l b_a book from the city library.thlast friday.l b_a book from the city library.the assistant said l could 请问 select top 1 1 from ... // IF EXISTS (SELECT name FROM m select * into b from a where 11 SQL 语句 SELECT * FROM {{table}} WHERE `fleet_end_time` SELECT 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 max(account_id ) from(select top 5 account_id from account)子查询没起作用为什么? select * from user_info where user_name in (select user_name from user)怎么改写提高效率谢谢了.