The CURRENT CLIENT_USERID special register specifies a
VARCHAR(255) value that contains the value of the client user ID from
the client information specified for
the current
connection.
In ODBC, SQLSetConnectAttr() can be used to set
the ODBC_ATTR_INFO_USERID connection attribute.
Find out in which department the current client user ID works.
SELECT DEPT FROM DEPT_USERID_MAP WHERE USER_ID = CURRENT CLIENT_USERID