oracle - Double 'at' symbol meaning in PL/SQL

Question

I know that @ symbol followed by a path means executing that script in PL/SQL. What does @@ followed by a path mean?

Answer 1

@@{url | file_name[.ext] } [arg...]

运行脚本。该命令与@（“at”符号）命令几乎相同。运行嵌套脚本时，它会在与调用脚本相同的路径或 url 中查找嵌套脚本。iSQL*Plus 仅支持 url 形式。@@ 命令的功能类似于@ 和 START。

参考：http ://docs.oracle.com/cd/B19306_01/server.102/b14357/ch12003.htm