如何从 MySql 中的表中获取 C# 中即将到来的约会？

Question

I need a way to populate a reminder in my winforms application of appointments that are coming up within the next 15 minutes of a user logging in. Every SQL query I've tried doesn't give me what I need. I am a noob, so please don't be too harsh. I don't have a table that gives me login times, only the appointment table with start date.

SELECT DISTINCT start FROM appointment WHERE start < NOW() - INTERVAL 15 MINUTE AND NOT EXISTS (SELECT * FROM appointment WHERE start = NOW() - INTERVAL 15 MINUTE )

Answer 1

I'm not sure exactly what your criteria are regarding login time and when you would check, but you need a where clause something like:

WHERE start BETWEEN NOW() and NOW() + INTERVAL 15 MINUTE

Your use of "- INTERVAL 15 MINUTE" is looking in the past, not the future.