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 can we calculate the Date in MySQL using functions?
In MySQL, we can use the following functions to calculate the Date −
- CURDATE() Function − Basically it returns the current date of the computer.
- YEAR() Function − It returns the year of the specified date.
- MONTH() function − It returns the month of the specified date.
- DAY() Function − It returns the day of the specified date.
- RIGHT() Function − It returns the number of character as specified within the function from the given date. The part of the expression that compares the returns from RIGHT() function evaluates 1 or 0.
To understand it, consider the data, as follows, from a table named ‘Collegedetail’ −
mysql> Select * from Collegedetail; +------+---------+------------+ | ID | Country | Estb | +------+---------+------------+ | 111 | INDIA | 2010-05-01 | | 130 | INDIA | 1995-10-25 | | 139 | USA | 1994-09-25 | | 1539 | UK | 2001-07-23 | | 1545 | Russia | 2010-07-30 | +------+---------+------------+ 5 rows in set (0.00 sec)
In the following query, we calculated the DATE by using all different date functions −
mysql> Select ID, Estb, CURDATE(), YEAR(Estb), MONTH(Estb), DAY(Estb), (RIGHT(CURDATE(),5) < RIGHT(estb,5))As 'Return' FROM Collegedetail; +------+------------+------------+------------+-------------+-----------+--------+ | ID | Estb | CURDATE() | YEAR(Estb) | MONTH(Estb) | DAY(Estb) | Return | +------+------------+------------+------------+-------------+-----------+--------+ | 111 | 2010-05-01 | 2017-11-30 | 2010 | 5 | 1 | 0 | | 130 | 1995-10-25 | 2017-11-30 | 1995 | 10 | 25 | 0 | | 139 | 1994-09-25 | 2017-11-30 | 1994 | 9 | 25 | 0 | | 1539 | 2001-07-23 | 2017-11-30 | 2001 | 7 | 23 | 0 | | 1545 | 2010-07-30 | 2017-11-30 | 2010 | 7 | 30 | 0 | +------+------------+------------+------------+-------------+-----------+--------+ 5 rows in set (0.00 sec) mysql> Select ID, estb, CURDATE(),((YEAR(CURDATE())-YEAR(estb))-(RIGHT(CURDATE(),5)<RIGHT(estb,5))) AS 'YEARS_OLD' from collegedetail; +------+------------+------------+-----------+ | ID | estb | CURDATE() | YEARS_OLD | +------+------------+------------+-----------+ | 111 | 2010-05-01 | 2017-11-30 | 7 | | 130 | 1995-10-25 | 2017-11-30 | 22 | | 139 | 1994-09-25 | 2017-11-30 | 23 | | 1539 | 2001-07-23 | 2017-11-30 | 16 | | 1545 | 2010-07-30 | 2017-11-30 | 7 | +------+------------+------------+-----------+ 5 rows in set (0.00 sec)
Updated on: 20-Jun-2020
87 Views
Advertisements