length with null value : LENGTH « Char Functions « Oracle PL / SQL

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2. Char Functions
3. LENGTH

length with null value

 
SQL>
SQL>
SQL> CREATE TABLE EMP
  2  (EMPNO NUMBER(4) NOT NULL,
  3   ENAME VARCHAR2(10),
  4   JOB VARCHAR2(9),
  5   MGR NUMBER(4),
  6   HIREDATE DATE,
  7   SAL NUMBER(7, 2),
  8   COMM NUMBER(7, 2),
  9   DEPTNO NUMBER(2)
 10  );

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, null,   '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> select ename, length( ename ) from emp;
ENAME      LENGTH(ENAME)
---------- -------------
SMITH                  5
ALLEN                  5
WARD                   4
JONES                  5
MARTIN                 6
BLAKE                  5
CLARK                  5
SCOTT                  5
KING                   4
TURNER                 6
ADAMS                  5
JAMES                  5

MILLER                 6

14 rows selected.

SQL>
SQL> drop table emp;

Table dropped.

SQL>
SQL>
SQL> --

 

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