count null : COUNT « Aggregate Functions « Oracle PL / SQL

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Oracle PL / SQL » Aggregate Functions » COUNT 
count null
   
SQL>
SQL>
SQL> CREATE TABLE EMP
  2  (EMPNO NUMBER(4NOT NULL,
  3   ENAME VARCHAR2(10),
  4   JOB VARCHAR2(9),
  5   MGR NUMBER(4),
  6   HIREDATE DATE,
  7   SAL NUMBER(72),
  8   COMM NUMBER(72),
  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);

row created.

SQL> INSERT INTO EMP VALUES (7499'ALLEN',  'SALESMAN',  7698,TO_DATE('20-FEB-1981', 'DD-MON-YYYY'), 1600,  30030);

row created.

SQL> INSERT INTO EMP VALUES (7521'WARD',   'SALESMAN',  7698,TO_DATE('22-FEB-1981', 'DD-MON-YYYY'), 1250,  50030);

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'),  1500,    030);

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, null, 'CLERK',     7782,TO_DATE('23-JAN-1982', 'DD-MON-YYYY'), 1300, NULL, 10);

row created.

SQL>
SQL> select ename from emp;
ENAME
----------
SMITH
ALLEN
WARD
JONES
MARTIN
BLAKE
CLARK
SCOTT
KING
TURNER
ADAMS
JAMES
FORD


14 rows selected.

SQL>
SQL>
SQL> select countename from emp;
COUNT(ENAME)
------------
          13

row selected.

SQL>
SQL> drop table emp;

Table dropped.

SQL> --

   
    
  
Related examples in the same category
1. COUNT(column) and COUNT(*): count the number of rows passed into the function.
2. Syntax: COUNT([DISTINCT]|[ALL] )
3. Using GROUP BY would tell us how many cars from each vendor we have on the lot:
4. Find out which maker has a null value car with count()
5. -Using the COUNT function in Having clause
6. Example using the COUNT function with group by clause
7. Count with group by: count for a group value
8. Get the number of rows in each city group using the COUNT() function
9. Column alias name for count function
10. Count(*) - count(column_Name)
11. count distinct column value
12. count(1)
13. count(distinct state)
14. Count(*) and column renaming
15. Count() with where clause
16. Count date field value, and calculation
17. Count department and calculate average salary
18. Count employee in a department after grouping by department id
19. Count employee, group by department id and job title
20. count(*) - count(onhand)
21. count(*) vs count(column name)
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