UID function in Oracle

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UID is an advanced function that the Oracle database supports. It is used to get the id number for a user’s session. The UID function is supported in the various versions of the Oracle/PLSQL, including, Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i and Oracle 8i.

Syntax: 

UID

Example: 

SELECT UID
INTO test_uid
FROM dual;

Explanation:
Here, the variable test_uid will contain the id number for the user’s session after the execution of the above query.