How to get SID (instance name) of Oracle?

Here is mine;

SQL> select sys_context(‘userenv’,’db_name’) from dual;
SYS_CONTEXT(‘USERENV’,’DB_NAME’)
——————————————————————————–
GDN90A

Other Information:

SQL> sho user

USER is “SCOTT”

SQL> select * from global_name;

GLOBAL_NAME

————————————————————

GDN90A.US.ORACLE.COM

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