Add 2 hours to current time in MySQL?

Question

Which is the valid syntax of this query in MySQL?

SELECT * FROM courses WHERE (now() + 2 hours) > start_time

note: start_time is a field of courses table

Persuade

Answer 1

SELECT * 
FROM courses 
WHERE DATE_ADD(NOW(), INTERVAL 2 HOUR) > start_time

See Date and Time Functions for other date/time manipulation.

Aric

Answer 2

You need DATE_SUB() OR DATE_ADD()

Expunction

If only there were examples. – Rotarian

Answer 3

SELECT * FROM courses WHERE (NOW() + INTERVAL 2 HOUR) > start_time

Scepter

Answer 4

The DATE_ADD() function will do the trick. (You can also use the ADDTIME() function if you're running at least v4.1.1.)

For your query, this would be:

SELECT * 
FROM courses 
WHERE DATE_ADD(now(), INTERVAL 2 HOUR) > start_time

Or,

SELECT * 
FROM courses 
WHERE ADDTIME(now(), '02:00:00') > start_time

Gird

If only there were examples. – Spider

The documentation has some good examples (and SO is not meant to be a replacement for the documentation).. But in the interest of this question and future visitors, I have added both syntaxes. – Gird

Answer 5

This will also work

SELECT NAME 
FROM GEO_LOCATION
WHERE MODIFY_ON BETWEEN SYSDATE() - INTERVAL 2 HOUR AND SYSDATE()

Mcloughlin