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
Return 0 in a new column when record is NULL in MySQL?
For this, you can use CASE statement. Let us first create a table −
mysql> create table DemoTable703 (Price int); Query OK, 0 rows affected (0.46 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable703 values(102); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable703 values(null); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable703 values(0); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable703 values(500); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable703 values(100); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable703 values(null); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable703 values(2340); Query OK, 1 row affected (0.14 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable703;
This will produce the following output -
+-------+ | Price | +-------+ | 102 | | NULL | | 0 | | 500 | | 100 | | NULL | | 2340 | +-------+ 7 rows in set (0.00 sec)
Use CASE statement −
mysql> select Price, case When Price IS NULL Then 0 else Price END AS Result from DemoTable703;
This will produce the following output -
+-------+--------+ | Price | Result | +-------+--------+ | 102 | 102 | | NULL | 0 | | 0 | 0 | | 500 | 500 | | 100 | 100 | | NULL | 0 | | 2340 | 2340 | +-------+--------+ 7 rows in set (0.00 sec)
Updated on: 21-Aug-2019
156 Views
Advertisements