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 1 for NOT NULL value in MySQL
To set NOT NULL, use IS NOT NULL and find the value. The syntax is as follows −
select if('' is not NULL,1,0) as anyAliasName;Here is the working query −
mysql> select if('' is not NULL,1,0);This will produce the following output −
+------------------------+
| if('' is not NULL,1,0) |
+------------------------+
| 1 |
+------------------------+
1 row in set (0.00 sec)To understand the above syntax, let us create a table −
mysql> create table DemoTable1915 ( Name varchar(20) ); Query OK, 0 rows affected (0.00 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1915 values('Chris');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1915 values('');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1915 values('David');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1915 values(NULL);
Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −
mysql> select * from DemoTable1915;
This will produce the following output −
+-------+ | Name | +-------+ | Chris | | | | David | | NULL | +-------+ 4 rows in set (0.00 sec)
Here is the query to implement IF() and set 1 for NOT NULL −
mysql> select if(Name IS NOT NULL,1,0) as Result from DemoTable1915;
This will produce the following output −
+--------+ | Result | +--------+ | 1 | | 1 | | 1 | | 0 | +--------+ 4 rows in set (0.00 sec)
Updated on: 30-Dec-2019
200 Views
Advertisements