Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Set the NULL values to 0 and display the entire column in a new column with MySQL SELECT
For this, use IFNULL(). Let us first create a table −
mysql> create table DemoTable (Value int); Query OK, 0 rows affected (1.02 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(NULL); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(NULL); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(30); Query OK, 1 row affected (0.13 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+-------+ | Value | +-------+ | NULL | | 10 | | 20 | | NULL | | 30 | +-------+ 5 rows in set (0.00 sec)
Set NULL values to 0 −
mysql> select Value,IFNULL(Value,0) from DemoTable;
This will produce the following output −
+-------+-----------------+ | Value | IFNULL(Value,0) | +-------+-----------------+ | NULL | 0 | | 10 | 10 | | 20 | 20 | | NULL | 0 | | 30 | 30 | +-------+-----------------+ 5 rows in set (0.00 sec)
Updated on: 22-Aug-2019
313 Views
Advertisements