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QUESTION
Good day everyone, I am currently struggling with writing mysql query which should make chat group from messages. App which I am making is taking data from other service, so it's not up to me to also manage chat groups, I need take this info from messages themselves.
My table of messages looks like this:
id sendAddr receiveAddr lastMessage text read 1 Ccbbd6uUZF2GD5wE5LEfjGPA3YWPjoLC6P CMKovgETx2oYxhoYKAeSakmipBjbmQ9ZHF 2021-06-02 12:57:39 test3 0 5 Ccbbd6uUZF2GD5wE5LEfjGPA3YWPjoLC6P CMKovgETx2oYxhoYKAeSakmipBjbmQ9ZHF 2021-06-02 13:00:44 test3 0 7 CMKovgETx2oYxhoYKAeSakmipBjbmQ9ZHF Ccbbd6uUZF2GD5wE5LEfjGPA3YWPjoLC6P 2021-06-10 23:13:59 testVPS 0 8 CMKovgETx2oYxhoYKAeSakmipBjbmQ9ZHF CYfMNQ62u1qwhCBqXzcmeJ8D9j4Yc1Pwef 2021-06-10 20:03:59 neco 0 9 CYfMNQ62u1qwhCBqXzcmeJ8D9j4Yc1Pwef CMKovgETx2oYxhoYKAeSakmipBjbmQ9ZHF 2021-06-10 21:03:59 test 0My only input data which I sent from my mobile app is receiveAddr
so I need to add this to group anything which containes address in either sentAddr
or receiveAddr
, here is representation of what I want to achieve
It needs to have latest text
counted amount of 0 in read
column and lastMessage
which is time of last message
I came up with something which sort of works if the user of the mobile app would be just receiving messages, which would be this:
SELECT sentAddr, COUNT(IF(campus.messages.read = 0, 1, NULL)) as unread, max(receiveTime) as lastMessage, max(text) as text FROM campus.messages WHERE (SELECT max(receiveTime) FROM campus.messages) AND receiveAddr = 'CMKovgETx2oYxhoYKAeSakmipBjbmQ9ZHF' GROUP BY sentAddr, receiveAddr
But sadly that does not get me a text from the latest message and not even taking into account that if the same user send some message, it shows as different group, which is not really helpful. I also came up with something which groups sendAddr and receiveAddr into one group no matter if it's on sending or receiving side:
GROUP BY CONCAT(LEAST(receiveAddr,sentAddr),' ', GREATEST(receiveAddr, sentAddr))
However in that case I can't with this added to upper query, it does not retrieve latest text, which is useless. So is there any chance of doing this with one query, no matter how long and convoluted it would be? And just to remind, only input data is user's address, which can be either sending or receiving address from the table. So is there any solution to this?
Version of the mysql database is 8.0.25
ANSWER
Answered 2021-Jun-15 at 07:54I figured it out, here it is:
QUESTION
So I just started c yesterday, literally. Being as fresh as I can be, I tried a fairly simple task of displaying an image on top of my desktop. First i tried it with pixels:
...ANSWER
Answered 2020-Aug-18 at 13:55
BitBlt(dc,0,0,487,456,Bitmap,0,0,SRCPAINT);
At this line you have tried to pass bitmap handle to device context handle parameter.
Note that BitBlt
transfering bits from one device context to another. You would create another one device context for your bitmap, select bitmap into it and then do what you want to. For example:
QUESTION
so basically I want to convert song what I downloaded from youtube in webm and convert to into mp3
when I wanted export song just with song.export("neco.mp3")
it didn't work too
I have in workfolder ffmpeg.exe and ffprobe.exe
here is the code
...ANSWER
Answered 2020-Aug-15 at 18:49Had a similar problem with ffmpeg.exe (4.3.1),
but everything works fine with ffmpeg-20200802-b48397e-win64-static,
since mp3_mf is not used in the standard container there
(WAV/MP3 in your problem, AVI in my problem).
So if you can't switch to a different ffmpeg version,
you should force it to use libmp3lame, not just mp3
and the use of (System?)-codec mp3_mf :
So don't use: -f mp3
Instead use (or add): -c:a libmp3lame
QUESTION
I have example here https://regex101.com/r/ZDof07/1
I need to select strings that don't contain http.
So, in my example I need to get string:
...ANSWER
Answered 2019-Jul-10 at 07:59You may use this regex with corrected lookahead assertion:
QUESTION
I am having trouble with a simple form. I am quite sure that I miss some critical info about this topic...
I created a custom module, I created a custom form
...ANSWER
Answered 2018-Sep-17 at 10:25Hellou,
so a competent colleque find an answer within minutes. I mean it was as silly as expected, just remove on click action on button and set the heading from the button to the form. And changed the button to submit. I quess the guy I copied the code from used some other spells of high magic so it worked for him. I hope this will help. Correct form below:
QUESTION
4:$textik = $_POST['text'];
...ANSWER
Answered 2017-Aug-02 at 09:48You need to use GET
, not POST
QUESTION
I have a problem my teacher want in code expectation and try catch. Protecting before wrong input and I need put this to my code I have something but isn't work properly if I put some letter like a,b,c the program fall down.
...ANSWER
Answered 2017-Jun-21 at 11:43You have your datatype integer for choose variable. So you cannot pass character or String as switch parameter.
Thanks
QUESTION
i was playing around with intersection types and i would expect following as working?
Could someone shed some light on it?
...ANSWER
Answered 2017-Jun-12 at 14:29The issue is that SomeResponse
has this type for code
:
QUESTION
After waiting for a while (2 or 3 minutes) to open .hs file in vim, I am getting following errors:
...ANSWER
Answered 2017-May-17 at 21:54Use :PluginClean
to delete plugins after you comment them out of your .vimrc
. See also :help vundle
for further details.
QUESTION
I am using Solr 6 to implement a search engine. The Problem I am facing is that when I searched for the word it returns some other results first and the actual query is at number 6.
For example I am searching for Cafe 9
It returns me this...
What I want is that it show Cafe 9 in 1st place and then other results as Cafe 9 is the exact match..
I have indexed all the fields with type text_general and the schema.xml is attached.
Thanks in advance.
...ANSWER
Answered 2017-Feb-16 at 13:40If you want to boost the score of documents containing all the query terms in close proximity then you can pass the pf
parameter with the value of the field name. In your case you should be passing pf=name
(pf
stands for phrase fields). The eDisMax query parser will attempt to make phrase queries out of all the terms in the q
parameter, and if it’s able to find the exact phrase in any of the phrase fields, it will apply the specified boost to the match for that document.
In case you're not using the eDisMax query parser by default you can use it temporarily for the current query by passing q={!edismax pf=name}cafe 9
.
You could also pass the pf2 parameter (as in pf2=name
) which works in a way similar to pf
except that the generated phrase queries are the bigrams in your query (that is, every two consecutive terms will be considered a boosting phrase). There's is also a pf3 parameter if that happens to be what you're looking for.
You can also customize the boost and pass more than one field name to the phrase proximity parameters (for instance, pf=name^2 title^3
).
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