Search notes:

SQL*Plus: SET DEFINE

set define sets the character that indicates substitution variables by prefixing them with this character 
set define !

define var=42
define tab=dual

select !var num from !tab;
Variable substitution can be turned of with 
set define off
The default character is the ampersand (&).

See also

Using define to assign a value to a variable.
Substitution variables
set escape
SQL*Plus

Index

Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/developm...', 1759437352, '216.73.216.42', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/development/databases/Oracle/SQL-Plus/set/define(58): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78