subtraction returning null value mysql

subtraction returning null value mysql

References

Reference NO 1

http://stackoverflow.com/questions/15195747/subtraction-returning-null-value-mysql

Reference NO 2

http://www.sitepoint.com/forums/showthread.php?429394-how-to-perform-subtraction-with-NULL-values-in-MYSQL

Reference NO 3

http://www.rustyrazorblade.com/2006/09/mysql-number-null-null/

Reference NO 4

http://dev.mysql.com/doc/refman/4.1/en/date-and-time-functions.html

Reference NO 5

https://zohoreportsapi.wiki.zoho.com/MySQL-Date-Time-Functions.html

Reference NO 6

http://www.w3resource.com/mysql/date-and-time-functions/date-and-time-functions.php

Reference NO 7

http://structure.usc.edu/mysql/manual_Functions.html

Reference NO 8

#EANF#