sql="delete from xiaolei where dalei_mz='"&dalei_mz&"'" sql语句中第二个等号后面的单引号是什么意思；单引号后面的双引号又是什么意思,单引号是定界符；双引号是什么（加什么）

英语翻译文件名是UserConfig.sql内容是:GO--delete old recorddelete from sysparam where p_name = 'Authercase' delete from sysparam where p_name = 'UserCFG_CRCCode' delete from sysparam where p_name = 'UserCFG_ICCard_Pwd' GO---- From Date:2007 Access Delete 语法要求实现SQL SQL类是的语句delete t1 From table1 as t Left join table2 as t2 on t1.f1=t2.f2 Where t2.f3='abc' delete from和delete * from 的区别小弟在编程时遇到了一个问题,工具是vb6.0,数据库是SQL2000,想实现删除用户表里面选中用户ID的全部信息,在语句sql=delete * from 用户表 where 用户名='& combo1.text &'时 sql=delete from xiaolei where dalei_mz='&dalei_mz&' sql语句中第二个等号后面的单引号是什么意思；单引号后面的双引号又是什么意思,单引号是定界符；双引号是什么（加什么） delete from A where a_id in (select id from B where b_id in (select id from C where c_id = ?))请问这句SQL语句怎么优化? 我的意思万一in语句里面的内容过多会出问题的,怎么用连接表的形式去delete? sql删除small bank company的雇员在works关系中的所有元组,下图加横线部分为主码delete from companywhere company-name = “small bank company”这样删除对吗? SQL简单语句 DELETE FROM table如何实现：删除Id从4到最后一条记录的SQL语句DELETE FROM table WHERE Id BETWEEN 4 AND ...我本来想：DELETE FROM table WHERE Id BETWEEN 4 AND (SELECT COUNT(Id) FROM table)但是不对啊. String sql= delete from rizhi where data=+data;为什么总是报错,data为varchar型.错误提示：You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' at line 1 if we want to retrieve data from the database with SQL,we should use the comand of ( )A、select B、update C、delete D、insert delete from与delete * fromdelete from ProdMain where ProdNum in (&delid&)我这个是从mdb数据库的应用中搞出来的,这一句不是用于sql数据库么?为什么在mdb数据库中也能用啊?mdb的不是delete * from.这样的格式么? 请问sql=select * from 招聘信息 order by id sql=select * from x where Min>2 and max delete from 表名 where status=1什么意思请问status=1代表什么? VFP里的%是什么意思例：delete from 图书 where 书名=”A% 为什么不用“A* I have delete you from my just delete me from your buddy list SQL >select count(*) from Teacher where teacherCode=? and teacherPassword=? java.sql.SQLException:SQL >select count(*) from Teacher where teacherCode=? and teacherPassword=?java.sql.SQLException: Can not issue executeUpdate() for SELECTsat com.mysql. $sql=SELECT count(*) as pcount FROM news 和$sql = UPDATE article SET这句是什么意思?