Update a value and a table with a foreign key - mysql

Question

ticketId(**)
timeExpected
timeElapsed
187
5
5
225
4
8
856
8
15
782
10
8
**primary key
*foreign key
id(**)
(*)ticketId
beyondTime
1
187
0
2
225
1
3
856
1
4
782
0
I have to know which ticket his out of time and I have this in mind and in my database but I can't figure it out with SQL. I want to know when a ticket is out of time like the ticket number 225 is, I would like to update the other table with a binary 1 for "out of time" and 0 "good".
I don't know if I can update the "beyondTime" table when I do "timeExpected - timeElapsed" in the first table when a ticket exceed the time expected.

Answer 1

First, let's simplify the problem you're looking a solution for:
Comparing two data field values for the rows in a table
I believe that's basically what you're trying to do. And of course, you can make a decision based on the comparison and act accordingly like updating some values in another table if you want to.
But if all you're looking for is kind of a report, then all you need would be just a select statement equipped with the logic doing the comparison for you.
You can use SQL Case Statement for this. Here is an easy guide if you want to take a look.
The select statement you need would be like this:
select ticketId, (case when timeElapsed > timeExpected then 1 else 0 end) as beyondTime from tickets
The result would be like this:
Two things to remember:
Don't get disappointed by the negative points and keep asking questions :)
Identify the issue you need help with and be specific with your question. I'd suggest you to update this question.
Good luck!