It would help if you explain a little better the background of the
problem you're trying to solve.
You want to find all the user IDs which have the same value on a
given time interval?
Is my understanding correct?
Yes.
Re-reading my post I saw that I could explain better!
id_user | value | datetime
1 | 1 | xxx
1 | 2 | xxx+1
1 | -1 | xxx+2
2 | -1 | xxx
2 | -1 | xxx+1
3 | 4 | xxx
3 | 10 | xxx+1
3 | 4 | xxx+2
4 | 3 | xxx
4 | 3 | xxx+1
So, the new question: how I can find which id_user has _all_ the "value"
that I'm looking for? Say -1 as 3 and I want a id_user=2 for the first
and for the latter id_user=4
OK, So, analysing your new question, the time interval is still important?
Or no longer?
So writting your query in english : "I want all users that don't change
"value" and their value is equal to x ?"
Or will you need to find all the users that don't change value with just one
query? And the query would return something like
id_user | value
2 | -1
4| 3
?
Please advice me on this.
I am just trying to avoid misunderstanding your requirements and ending up
with a query that doesn't really do what you need.
Best,
Oliver
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