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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 0

My 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

user otherParticipant unread lastMessage text CMKovgETx2oYxhoYKAeSakmipBjbmQ9ZHF Ccbbd6uUZF2GD5wE5LEfjGPA3YWPjoLC6P 5 2021-06-10 23:13:59 testVPS CMKovgETx2oYxhoYKAeSakmipBjbmQ9ZHF CYfMNQ62u1qwhCBqXzcmeJ8D9j4Yc1Pwef 1 2021-06-10 21:03:59 test

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

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Hello and thank you for reading this.

First off, I have to say that I can't use JavaScript. I am not aloud to any code that needs 'upkeep' because we run hundreds of sites for hundreds of clients in-house clients. Any code that needs maintenance is highly discouraged. I've tried to push back and it's not working. I don't have the power.

With that said, I have a client that would like to have icons to represent topics and when you roll over the icon, there is an overlay over said icon with the text saying what the topic is.

For example, if there is the topic 'Fruit' there would be a photo representation of a fruit (say, a banana). When the mouse rolls over the banana pic, an overlay would appear with the word fruit in the middle.

This isn't about the overlay or the icon.

What I would like to know is if I can read read the topic name in and have that displayed in the :after pseudo element.

In pretend code, this is what I'm tryin to do:

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The documentation for convertMaps says that it supports the following transformation:

(CV_32FC1, CV_32FC1)→(CV_16SC2, CV_16UC1) This is the most frequently used conversion operation, in which the original floating-point maps (see remap) are converted to a more compact and much faster fixed-point representation. The first output array contains the rounded coordinates and the second array (created only when nninterpolation=false) contains indices in the interpolation tables.

I understand that (CV_32FC1, CV_32FC1) is encoding (x, y) coordinates as floats. How does the fixed point format work? What is encoded in each 2-channel entry of the CV_16SC2 matrix? What interpolation tables does the CV_16UC1 matrix index into?

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I am working on recovering from collision. I have the names of bodies in collision and the frames associated with them and now I want to move the body/frame that is closer to the end effector to get out of collision, but I couldn't find a straightforward way to get this information from a MultiBodyPlant. I could construct another representation of the graph and search through it, but I was wondering if it is possible to maybe get this from drake instead?

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To reproduce this, try this shell script (I'm running Dash 0.5.10.2-7 and R 4.0.2 on Ubuntu 20.10):

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My question is: what's the criteria to determine it fits or not?

Why do both std::is_signed::value std::is_signed::value gives false. Why don't they fit in int? 0x80000000 has the same bit representation as signed -1 signed -2147483648.

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so I have a class whose hash representation looks like this. {"dateTime"=>[1484719381, 1484719381], "dateTime1"=>[1484719381, 1484719381]} The dateTime here is is a unix formatted dateTime array.

I am trying to convert this hash to an equivalent of json_string for which I am using hash.to_json. Is there any way through which I can modify the format of date_time when calling to_json. The resulting json should look like this

'{"dateTime1":["2017-01-18T06:03:01+00:00","2017-01-18T06:03:01+00:00"]}'

Basically I am looking for an implementation that can be called during hash.to_json.

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Is there a simple way to just print out or export the correlation matrix from a cor() in basic R?

I can find ways to use pairs() and corrplot() to make very fancy representations of correlation matrices. However, I just want a basic table using the minimum amount of code so I can send it to my colleagues while I conduct exploratory data analysis. Currently I'm reduced to just copying and pasting, which has some problems when the number of variables gets too large. Here is the code I am using:

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