SQL*Plus FAQ
What is SQL*Plus and where does it come from?
SQL*Plus is a command line SQL and PL/SQL language interface and reporting tool that ships with the Oracle Database Client and Server software. It can be used interactively or driven from scripts. SQL*Plus is frequently used by DBAs and Developers to interact with the Oracle database.
If you are familiar with other databases, sqlplus is equivalent to:
"sql" in Ingres,
"isql" in Sybase and SQL Server,
"sqlcmd" in Microsoft SQL Server,
"db2" in IBM DB2,
"psql" in PostgreSQL, and
"mysql" in MySQL.
SQL*Plus's predecessor was called UFI (User Friendly Interface). UFI was included in the first Oracle releases up to Oracle 4. The UFI interface was extremely primitive and, in today's terms, anything but user friendly. If a statement was entered incorrectly, UFI issued an error and rolled back the entire transaction (ugggh).
How does one use the SQL*Plus utility?
Start using SQL*Plus by executing the "sqlplus" command-line utility from the $ORACLE_HOME/bin directory. Some of the command line options:
userid/password@db -- Connection details
/nolog -- Do not login to Oracle. You will need to do it yourself.
-s or -silent -- start sqlplus in silent mode. Not recommended for beginners!
@myscript -- Start executing script called "myscript.sql"
Look at this example session:
sqlplus /nolog
SQL> connect scott/tiger
SQL> select * from tab;
SQL> disconnect
SQL> exit
Please note that one must prepare the environment before starting sqlplus.
Linux/ Unix example:
$ . oraenv
ORACLE_SID = [orcl] ? orcl
$ sqlplus scott/tiger
Windows Example:
Click on "Start" -> "Run" and enter "cmd"
C:> set ORACLE_SID=orcl
C:> sqlplus scott/tiger
or...
C:> sqlplus scott/tiger@orcl
What commands can be executed from SQL*
相关文档：
1.获取所有数据库名:
SELECT Name from Master..SysDatabases ORDER BY Name
2.获取所有表名:
SELECT Name from DatabaseName..SysObjects Where XType='U' ORDER BY Name
XType='U':表示所有用户表;
XType='S':表示所有系统表;
3.获取所有字段名:
SELECT Name from SysColumns WHERE id=Object_Id('TableNam ......
下列语句部分是Mssql语句，不可以在access中使用。
SQL分类：
DDL—数据定义语言(CREATE，ALTER，DROP，DECLARE)
DML—数据操纵语言(SELECT，DELETE，UPDATE，INSERT)
DCL—数据控制语言(GRANT，REVOKE，COMMIT，ROLLBACK)
首先,简要介绍基础语句：
1、说明：创建数据库
......
一个简单的小实例就明白~！
user表
在这张表中建立触发器
Create trigger tiggername
on user
for delete
as
begin ......
