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
How to count horizontal values on a MySQL database?
You can use aggregate function COUNT() from MySQL to count horizontal values on a database. Let us first create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstValue int, SecondValue int, ThirdValue int, FourthValue int ); Query OK, 0 rows affected (0.59 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(FirstValue,SecondValue,ThirdValue,FourthValue) values(-18,45,0,155); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable(FirstValue,SecondValue,ThirdValue,FourthValue) values(0,235,null,15); Query OK, 1 row affected (0.20 sec)
Following is the query to display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+----+------------+-------------+------------+-------------+ | Id | FirstValue | SecondValue | ThirdValue | FourthValue | +----+------------+-------------+------------+-------------+ | 1 | -18 | 45 | 0 | 155 | | 2 | 0 | 235 | NULL | 15 | +----+------------+-------------+------------+-------------+ 2 rows in set (0.00 sec)
Here is the query to count horizontal values on a database −
mysql> SELECT COUNT(FirstValue > 0 OR NULL) + COUNT(SecondValue > 0 OR NULL) + COUNT(ThirdValue > 0 OR NULL) + COUNT(FourthValue > 0 OR NULL) AS TOTAL_VALUE FROM DemoTable;
This will produce the following output −
+-------------+ | TOTAL_VALUE | +-------------+ | 4 | +-------------+ 1 row in set (0.00 sec)
Updated on: 30-Jul-2019
327 Views
Advertisements