Example: LEAD with IGNORE NULLS

Teradata Database SQL Functions, Operators, Expressions, and Predicates

brand
Software
prodname
Teradata Database
vrm_release
16.10
category
Programming Reference
featnum
B035-1145-161K

ANSI style syntax:

SELECT empno, empname, job, sal,
       LEAD(sal, 1, 0) IGNORE NULLS
       OVER (PARTITION BY job ORDER BY empno) AS sal_next
FROM   emp
ORDER BY job, empno;

 EMPNO      EMPNAME      JOB       SAL      SAL_NEXT
---------- ---------- --------- ---------- ----------
   12        PAUL       ANALYST    ?          3000
   13        GRACE      ANALYST    3000       0
   1         JOHN       CLERK      800        950
   2         ERIC       CLERK      950        1300
   3         KURT       CLERK      ?          1300
   6         JULIE      CLERK      1300       0
   9         NICHOLAS   MANAGER    2450       2850
   10        NOVAK      MANAGER    ?          2850
   11        ROGER      MANAGER    2850       0
   14        RICH       PRESIDENT  5000       0
   4         KENT       SALESMAN   1250       1500
   5         LYNN       SALESMAN   ?          1500
   7         TERESA     SALESMAN   1500       1600
   8         MATTHEW    SALESMAN   1600       0

Teradata style syntax:

SELECT empno, empname, job, sal,
       LEAD(sal IGNORE NULLS, 1, 0) 
       OVER (PARTITION BY job ORDER BY empno) AS sal_next
FROM   emp
ORDER BY job, empno;

 EMPNO      EMPNAME      JOB       SAL      SAL_NEXT
---------- ---------- --------- ---------- ----------
   12        PAUL       ANALYST    ?          3000
   13        GRACE      ANALYST    3000       0
   1         JOHN       CLERK      800        950
   2         ERIC       CLERK      950        1300
   3         KURT       CLERK      ?          1300
   6         JULIE      CLERK      1300       0
   9         NICHOLAS   MANAGER    2450       2850
   10        NOVAK      MANAGER    ?          2850
   11        ROGER      MANAGER    2850       0
   14        RICH       PRESIDENT  5000       0
   4         KENT       SALESMAN   1250       1500
   5         LYNN       SALESMAN   ?          1500
   7         TERESA     SALESMAN   1500       1600
   8         MATTHEW    SALESMAN   1600       0