How to escape "&" character ?

I want to execute the following statement in sqldeveloper
select '&sdfas' from dual
and expect the outcome to be the string "&sdfas"
but sqldeveloper keep asking me for the value of "sdfas" argument, and replace it.
I use sqldeveloper to run sql script to patch many pl/sql packages in my company. The packages, unfortunately, contain some "&" characters in rather critical position. And my last few days is spent chaotically trouble-shooting this.
Any method to escape "&" character ? I tried to export DDL with sqldeveloper itself but the outcome is still not being escaped properly.

Sake,
You can use the following to escape the &:
set define off
It's also possible to set another character to use for substitution variables.
See the online documentation: http://download.oracle.com/docs/cd/B19306_01/server.102/b14357/ch12040.htm#i2698854

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Thanks, but thats not really answering the two
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The quoted example was just
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>
shall I repeat myself:-
My questions are :
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How to escape "&" character ?

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