Lead over partition : LAG LEAD « Analytical Functions « Oracle PL / SQL

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Oracle PL / SQL » Analytical Functions » LAG LEAD 
Lead over partition
 
SQL>
SQL> CREATE TABLE EMP (EMPNO NUMBER(4NOT NULL,
  2                    ENAME VARCHAR2(10),
  3                    JOB VARCHAR2(9),
  4                    MGR NUMBER(4),
  5                    HIREDATE DATE,
  6                    SAL NUMBER(72),
  7                    COMM NUMBER(72),
  8                    DEPTNO NUMBER(2));

Table created.

SQL>
SQL> INSERT INTO EMP VALUES (7369'SMITH', 'CLERK',    7902, TO_DATE('17-DEC-1980', 'DD-MON-YYYY'), 800, NULL, 20);

row created.

SQL> INSERT INTO EMP VALUES (7499'ALLEN', 'SALESMAN', 7698, TO_DATE('20-FEB-1981', 'DD-MON-YYYY'), 160030030);

row created.

SQL> INSERT INTO EMP VALUES (7521'WARD',  'SALESMAN', 7698, TO_DATE('22-FEB-1981', 'DD-MON-YYYY'), 125050030);

row created.

SQL> INSERT INTO EMP VALUES (7566'JONES', 'MANAGER',  7839, TO_DATE('2-APR-1981',  'DD-MON-YYYY'), 2975, NULL, 20);

row created.

SQL> INSERT INTO EMP VALUES (7654'MARTIN', 'SALESMAN', 7698,TO_DATE('28-SEP-1981', 'DD-MON-YYYY'), 1250140030);

row created.

SQL> INSERT INTO EMP VALUES (7698'BLAKE', 'MANAGER', 7839,TO_DATE('1-MAY-1981', 'DD-MON-YYYY'), 2850, NULL, 30);

row created.

SQL> INSERT INTO EMP VALUES (7782'CLARK', 'MANAGER', 7839,TO_DATE('9-JUN-1981', 'DD-MON-YYYY'), 2450, NULL, 10);

row created.

SQL> INSERT INTO EMP VALUES (7788'SCOTT', 'ANALYST', 7566,TO_DATE('09-DEC-1982', 'DD-MON-YYYY'), 3000, NULL, 20);

row created.

SQL> INSERT INTO EMP VALUES (7839'KING', 'PRESIDENT', NULL,TO_DATE('17-NOV-1981', 'DD-MON-YYYY'), 5000, NULL, 10);

row created.

SQL> INSERT INTO EMP VALUES (7844'TURNER', 'SALESMAN', 7698,TO_DATE('8-SEP-1981', 'DD-MON-YYYY'), 1500030);

row created.

SQL> INSERT INTO EMP VALUES (7876'ADAMS', 'CLERK', 7788,TO_DATE('12-JAN-1983', 'DD-MON-YYYY'), 1100, NULL, 20);

row created.

SQL> INSERT INTO EMP VALUES (7900'JAMES', 'CLERK', 7698,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 950, NULL, 30);

row created.

SQL> INSERT INTO EMP VALUES (7902'FORD', 'ANALYST', 7566,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 3000, NULL, 20);

row created.

SQL> INSERT INTO EMP VALUES (7934'MILLER', 'CLERK', 7782,TO_DATE('23-JAN-1982', 'DD-MON-YYYY'), 1300, NULL, 10);

row created.

SQL>
SQL> CREATE TABLE DEPT (DEPTNO NUMBER(2),DNAME VARCHAR2(14),LOC VARCHAR2(13) );

Table created.

SQL>
SQL> INSERT INTO DEPT VALUES (10'ACCOUNTING', 'NEW YORK');

row created.

SQL> INSERT INTO DEPT VALUES (20'RESEARCH', 'DALLAS');

row created.

SQL> INSERT INTO DEPT VALUES (30'SALES', 'CHICAGO');

row created.

SQL> INSERT INTO DEPT VALUES (40'OPERATIONS', 'BOSTON');

row created.

SQL>
SQL> select from emp;

     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
      7369 SMITH      CLERK           7902 17-DEC-80        800                    20
      7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30
      7521 WARD       SALESMAN        7698 22-FEB-81       1250        500         30
      7566 JONES      MANAGER         7839 02-APR-81       2975                    20
      7654 MARTIN     SALESMAN        7698 28-SEP-81       1250       1400         30
      7698 BLAKE      MANAGER         7839 01-MAY-81       2850                    30
      7782 CLARK      MANAGER         7839 09-JUN-81       2450                    10
      7788 SCOTT      ANALYST         7566 09-DEC-82       3000                    20
      7839 KING       PRESIDENT            17-NOV-81       5000                    10
      7844 TURNER     SALESMAN        7698 08-SEP-81       1500          0         30
      7876 ADAMS      CLERK           7788 12-JAN-83       1100                    20

     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
      7900 JAMES      CLERK           7698 03-DEC-81        950                    30
      7902 FORD       ANALYST         7566 03-DEC-81       3000                    20
      7934 MILLER     CLERK           7782 23-JAN-82       1300                    10

14 rows selected.

SQL> select from dept;

    DEPTNO DNAME          LOC
---------- -------------- -------------
        10 ACCOUNTING     NEW YORK

        20 RESEARCH       DALLAS

        30 SALES          CHICAGO

        40 OPERATIONS     BOSTON


SQL>
SQL> select deptno, ename, sal,
  2             leadename, 1'N/A' ) over partition by deptno
  3                                           order by sal next_ename,
  4             leadsal, 1null over partition by deptno
  5                                             order by sal next_sal
  6        from emp
  7       /

    DEPTNO ENAME             SAL NEXT_ENAME   NEXT_SAL
---------- ---------- ---------- ---------- ----------
        10 MILLER           1300 CLARK            2450
        10 CLARK            2450 KING             5000
        10 KING             5000 N/A
        20 SMITH             800 ADAMS            1100
        20 ADAMS            1100 JONES            2975
        20 JONES            2975 SCOTT            3000
        20 SCOTT            3000 FORD             3000
        20 FORD             3000 N/A
        30 JAMES             950 MARTIN           1250
        30 MARTIN           1250 WARD             1250
        30 WARD             1250 TURNER           1500

    DEPTNO ENAME             SAL NEXT_ENAME   NEXT_SAL
---------- ---------- ---------- ---------- ----------
        30 TURNER           1500 ALLEN            1600
        30 ALLEN            1600 BLAKE            2850
        30 BLAKE            2850 N/A

14 rows selected.

SQL>
SQL> drop table emp cascade constraints;

Table dropped.

SQL> drop table dept cascade constraints;

Table dropped.

 
Related examples in the same category
1.LAG() and LEAD(): get a value in a row where that row is a certain number of rows away from the current row
2.The Row Comparison Functions LEAD and LAG
3.The row comparison function can also be partitioned as with other aggregates
4.LAG, LEAD: allow specified offsets and default values for the nulls that result in non-applicable rows
5.lead over order by
6.Lag over
7.Lag over order
8.Use lag over in inner query
9.Use lag over and lead over in inner statement
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