&

The At & character is the default character that define a substitution variable. You can change it with the define system variable.

:

How you can use a bind variable in SQLPlus

Slash

The slash command (/):

• is an end of statement character for a PL/SQL block in a script
• is an alias for the run command. It runs the last query : /

Exclamation mark

The exclamation mark is an alias of the HOST command on Unix system. It permits to send an shell command.

SQL> !pwd
/home/oracle

Arobase

See SQL Plus - (Arobase|At) (@ and @@)

;

; is:

• the end of a SQL command in a script
• an alias to the LIST command

Anti-Slash

The anti-slash (\) is the default escape character

Question mark

The question mark is the equivalent of the ORACLE_HOME directory when using the start command.

Example: to start the compilation script utlrp.sql

@?/rdbms/admin/utlrp.sql

.

The Period is the default character of concat