IS UNTIL_CLOSED/IS NOT UNTIL_CLOSED Example 1 - Teradata Vantage

CREATE MULTISET TABLE employee(
 empno INTEGER,
 ename VARCHAR(50),
 deptno INTEGER,
 jobstart TIMESTAMP WITH TIME ZONE NOT NULL 
   GENERATED ALWAYS AS ROW START,
 jobend TIMESTAMP WITH TIME ZONE NOT NULL AS 
   GENERATED ALWAYS AS ROW END,
 PERIOD FOR SYSTEM_TIME(jobstart,jobend)
 )
 PRIMARY INDEX(empno) WITH SYSTEM VERSIONING;

Assume the table contains the following row:

empno ename  deptno                          jobstart                            jobend
----- ------ ------  --------------------------------  --------------------------------
1025 John      999  2005-02-03 12:12:12.123456+00:00  9999-12-31 23:59:59.999999+00:00

The following SELECT statements give these results:

SELECT empno,ename(CHAR(6)) FROM employee 
 WHERE END(SYSTEM_TIME) IS UNTIL_CLOSED;

empno ename
------ ------
  1025 John

SELECT empno,ename(CHAR(6)) FROM employee 
 WHERE END(SYSTEM_TIME) IS NOT UNTIL_CLOSED;

*** Query completed. No rows found.