today:
448
yesterday:
667
Total:
1,015,318

SQL NVL

admin 2016.05.19 15:08 Views : 159

NVL

Syntax

Description of nvl.gif follows
Description of the illustration nvl.gif

Purpose

NVL lets you replace null (returned as a blank) with a string in the results of a query. If expr1 is null, then NVL returns expr2. If expr1 is not null, then NVL returns expr1.

The arguments expr1 and expr2 can have any datatype. If their datatypes are different, then Oracle Database implicitly converts one to the other. If they are cannot be converted implicitly, the database returns an error. The implicit conversion is implemented as follows:

  • If expr1 is character data, then Oracle Database converts expr2 to the datatype of expr1 before comparing them and returns VARCHAR2 in the character set of expr1.

  • If expr1 is numeric, then Oracle determines which argument has the highest numeric precedence, implicitly converts the other argument to that datatype, and returns that datatype.

    See Also:

    Table 2-10, "Implicit Type Conversion Matrix" for more information on implicit conversion and "Numeric Precedence" for information on numeric precedence

Examples

The following example returns a list of employee names and commissions, substituting "Not Applicable" if the employee receives no commission:

SELECT last_name, NVL(TO_CHAR(commission_pct), 'Not Applicable')
   "COMMISSION" FROM employees
   WHERE last_name LIKE 'B%'
   ORDER BY last_name;
 
LAST_NAME                 COMMISSION
------------------------- ----------------------------------------
Baer                      Not Applicable
Baida                     Not Applicable
Banda                     .1
Bates                     .15
Bell                      Not Applicable
Bernstein                 .25
Bissot                    Not Applicable
Bloom                     .2
Bull                      Not Applicable
No. Subject Author Date Views
106 Delimiter admin 2016.04.29 144
105 Report by Order / Product / Order and Product / By Order & Non Order admin 2016.04.29 230
104 Outer Join with Oracle SQL admin 2016.04.29 154
103 EXPORT & IMPORT admin 2016.05.01 180
102 wwv_flow_files admin 2016.05.01 159
101 APEX ADMIN PASSWORD 바꾸기 admin 2016.05.02 124
100 HEAD TITLE (제목)을 조건에 따라 바꾸기 admin 2016.05.03 141
99 EMPLOYEE_LEVEL_ID admin 2016.05.03 99
98 Group by, Order by (두개의 Table을 활용한 Sub Total / 최고값 ) admin 2016.05.06 242
97 Interactive Report admin 2016.05.07 126
96 Fundamentals of PL/SQL admin 2016.05.10 2049
95 Display Value, Return Value admin 2016.05.10 132
94 BOOLEAN SAMPLE admin 2016.05.11 152
93 test admin 2016.05.11 135
92 CREATE VIEW admin 2016.05.13 233
91 3D Pie Chart admin 2016.05.17 231
90 TREE admin 2016.05.18 731
89 INSTR admin 2016.05.19 794
» NVL admin 2016.05.19 159
87 ROWNUM admin 2016.05.19 246