first_value over order by : First Last Value « Analytical Functions « Oracle PL / SQL

1. Oracle PL / SQL
2. Analytical Functions
3. First Last Value

first_value over order by

 
SQL>
SQL> set echo on
SQL> column first_asc format a16
SQL> column first_desc format a16
SQL> column last_asc format a16
SQL> column last_desc format a16
SQL>
SQL> CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,
  2                    ENAME VARCHAR2(10),
  3                    JOB VARCHAR2(9),
  4                    MGR NUMBER(4),
  5                    HIREDATE DATE,
  6                    SAL NUMBER(7, 2),
  7                    COMM NUMBER(7, 2),
  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);

1 row created.

SQL> INSERT INTO EMP VALUES (7499, 'ALLEN', 'SALESMAN', 7698, TO_DATE('20-FEB-1981', 'DD-MON-YYYY'), 1600, 300, 30);

1 row created.

SQL> INSERT INTO EMP VALUES (7521, 'WARD',  'SALESMAN', 7698, TO_DATE('22-FEB-1981', 'DD-MON-YYYY'), 1250, 500, 30);

1 row created.

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

1 row created.

SQL> INSERT INTO EMP VALUES (7654, 'MARTIN', 'SALESMAN', 7698,TO_DATE('28-SEP-1981', 'DD-MON-YYYY'), 1250, 1400, 30);

1 row created.

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

1 row created.

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

1 row created.

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

1 row created.

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

1 row created.

SQL> INSERT INTO EMP VALUES (7844, 'TURNER', 'SALESMAN', 7698,TO_DATE('8-SEP-1981', 'DD-MON-YYYY'), 1500, 0, 30);

1 row created.

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

1 row created.

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

1 row created.

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

1 row created.

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

1 row created.

SQL>
SQL>
SQL> select ename, sal, hiredate, hiredate-100 windowtop,
  2         first_value( ename )
  3             over ( order by hiredate asc
  4                    range 100 preceding ) ename_prec,
  5         first_value( hiredate )
  6             over ( order by hiredate asc
  7                    range 100 preceding ) hiredate_prec
  8    from emp
  9   order by hiredate asc
 10  /

ENAME            SAL HIREDATE  WINDOWTOP ENAME_PREC HIREDATE_
---------- --------- --------- --------- ---------- ---------
SMITH         800.00 17-DEC-80 08-SEP-80 SMITH      17-DEC-80
ALLEN        1600.00 20-FEB-81 12-NOV-80 SMITH      17-DEC-80
WARD         1250.00 22-FEB-81 14-NOV-80 SMITH      17-DEC-80
JONES        2975.00 02-APR-81 23-DEC-80 ALLEN      20-FEB-81
BLAKE        2850.00 01-MAY-81 21-JAN-81 ALLEN      20-FEB-81
CLARK        2450.00 09-JUN-81 01-MAR-81 JONES      02-APR-81
TURNER       1500.00 08-SEP-81 31-MAY-81 CLARK      09-JUN-81
MARTIN       1250.00 28-SEP-81 20-JUN-81 TURNER     08-SEP-81
KING         5000.00 17-NOV-81 09-AUG-81 TURNER     08-SEP-81
FORD         3000.00 03-DEC-81 25-AUG-81 TURNER     08-SEP-81
JAMES         950.00 03-DEC-81 25-AUG-81 TURNER     08-SEP-81

ENAME            SAL HIREDATE  WINDOWTOP ENAME_PREC HIREDATE_
---------- --------- --------- --------- ---------- ---------
MILLER       1300.00 23-JAN-82 15-OCT-81 KING       17-NOV-81
SCOTT        3000.00 09-DEC-82 31-AUG-82 SCOTT      09-DEC-82
ADAMS        1100.00 12-JAN-83 04-OCT-82 SCOTT      09-DEC-82

14 rows selected.

SQL>
SQL>
SQL> drop table emp;

Table dropped.

 

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