[sql] How do I ignore ampersands in a SQL script running from SQL Plus?

I have a SQL script that creates a package with a comment containing an ampersand (&). When I run the script from SQL Plus, I am prompted to enter a substitute value for the string starting with &. How do I disable this feature so that SQL Plus ignores the ampersand?

I had a CASE statement with WHEN column = 'sometext & more text' THEN ....

I replaced it with WHEN column = 'sometext ' || CHR(38) || ' more text' THEN ...

you could also use WHEN column LIKE 'sometext _ more text' THEN ...

(_ is the wildcard for a single character)

You can set the special character, which is looked for upon execution of a script, to another value by means of using the SET DEFINE <1_CHARACTER>

By default, the DEFINE function itself is on, and it is set to &

It can be turned off - as mentioned already - but it can be avoided as well by means of setting it to a different value. Be very aware of what sign you set it to. In the below example, I've chose the # character, but that choice is just an example.

SQL> select '&var_ampersand #var_hash' from dual;
Enter value for var_ampersand: a value

'AVALUE#VAR_HASH'
-----------------
a value #var_hash

SQL> set define #
SQL> r
  1* select '&var_ampersand #var_hash' from dual
Enter value for var_hash: another value

'&VAR_AMPERSANDANOTHERVALUE'
----------------------------
&var_ampersand another value

SQL>

According to this nice FAQ there are a couple solutions.

You might also be able to escape the ampersand with the backslash character \ if you can modify the comment.

set define off <- This is the best solution I found

I also tried...

set define }

I was able to insert several records containing ampersand characters '&' but I cannot use the '}' character into the text So I decided to use "set define off" and everything works as it should.

If you sometimes use substitution variables you might not want to turn define off. In these cases you could convert the ampersand from its numeric equivalent as in || Chr(38) || or append it as a single character as in || '&' ||.

I resolved with the code below:

set escape on

and put a \ beside & in the left 'value_\&_intert'

Att