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Saturday, 6 September 2014

NVL function in Oracle

NVL function in Oracle return default value if there is NULL value in the first expression.

Syntax:-

NVL(EXPRESSION,'DEFAULT_VALUE);

Example:-

SELECT EMPNO,NVL(EMPNAME,'CHANCHAL') AS EMPNAME,NVL(SALARY,9000) AS SALARY
FROM EMPLOYEE
WHERE EMPNO=7;

SQL> SELECT * FROM EMPLOYEE;

     EMPNO EMPNAME                  SALARY     DEPTNO
---------- -------------------- ---------- ----------
         1 CHANCHAL                   1000         10
         2 WANKHADE                   2000         20
         3 SCOTT                      3000        200
         4 TIGER                      4000        200
         5 JOHN                       5000        300
         6 JAKE                       6000        300
         7

7 rows selected.

SQL> SELECT EMPNO,NVL(EMPNAME,'CHANCHAL') AS EMPNAME,NVL(SALARY,9000) AS SALARY
  2  FROM EMPLOYEE
  3  WHERE EMPNO=7;

     EMPNO EMPNAME                  SALARY
---------- -------------------- ----------
         7 CHANCHAL                   9000




Read Also:-  ISNULL function in SQL

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