如何用sql语句关闭数据库

❶ mdb数据库如何使用sql语句

1、打开mdb的一个数据；
2、打开主界面，点击表student，可以查看它的内容；
3、点击上方的创建；
4、继续点击查询设计；
5、马上会弹出一个窗口显示表，直接点击关闭；
6、右键图中查询1；
7、在弹出的列表中选择SQL视图；
8、看到SELECT，同时在这个方框内输入图中所示SQL语句；
9、点击左上方的运行按钮；
10、运行sql结果成功。

❷ 急急急 如何在SQL*Plus中，用命令行关闭和开启Oracle数据库服务器

1. Set up your Oracle environment.

If you are using Windows operating system, do the followings:

set ORACLE_HOME=C:\oracle\proct\10.2.0.1.0
set ORACLE_SID=xxxxxxx

(Change C:\oracle\proct\10.2.0.1.0 to your own Oracle Home)
(Change xxxxxxx to your database name)

If you are using UNIX (e.g. HP-UX) operating system, do the followings:

export ORACLE_SID=xxxxxxx
export ORACLE_HOME=/u01/app/oracle/proct/10.2.0.1.0

(Change /u01/app/oracle/proct/10.2.0.1.0 to your own Oracle Home)
(Change xxxxxxx to your database name)

2. connect as sysdba

Start SQL*Plus, and connect to the database as sysdba. Use the following command:

connect sys/aaaaaaa@bbbbbbb as sysdba

(aaaaaaa is your password for sys)
(bbbbbbb is the connection string defined in tnsnames.ora)

3. Shut down or start up database.

To shut down, use this command:

shutdowm immediate

If the database has problem, and it hangs, use this command:

shutdown abort

To startup, use this command:

startup

If the database does not use spfile, and the pfile is not in the default location, use this command:

startup pfile=C:\aaa\bbb\ccc\ddd\init.ora

(C:\aaa\bbb\ccc\ddd\init.ora should be the init.ora file’s path of your database)

Good luck!

❸ 怎样用sql语句删除整个表及数据库

工具/材料：Management Studio。

1、首先在桌面上，点击“Management Studio”图标。