How does mongodb count the number of subdocuments?

As title. MongoDB can use the count method to count the number of documents in a collection, which is a collection method, but how to count the number of embedded sub-documents? I checked the official documentation and couldn't find a suitable method in the aggregation framework. I hope someone can ...

高洛峰 2017-05-02 09:23:13 0  0  674

Change count value in Vuex store of Vue app using v-model

This code does not generate an error but when I change the count it does not display the results on the screen. Please help me solve this problem. importVuefrom'vue'importVuexfrom'vuex'Vue.use(Vuex)exportdefaultnewVuex.Store({state:{lists:[{title:"User",count:15,},{title:"Admin",...

P粉882357979 2024-03-22 00:31:42 0  1  535

SQL Count() also requires 0

I have only one table and I want to count each entry of a tag that starts with 0. Now I try this: SELECT tag,COUNT(start)ASAnzahl,user_idFROMdatensammlung WHERE (start='1')AND(user_id='1') GROUPBYlabel; but the return is only: label number user ID1_eating spoon 2011_blowing nose 201 But I want this:...

P粉547362845 2024-04-06 19:48:53 0  1  878

Add count (.length) of each item in options of v-select

I want to add course.length from api to each item option on v-select and display the data to activity based filter. For example: items in v-select contain options all(count), passed(count), notcomplete(count) filtered from online.passed, etc. filtered from online.complete. vue.js template:<templa...

P粉197639753 2024-03-31 21:05:16 0  1  608

sql - PHP query record number problem, count exception

{Code...} There is no problem when the sql command line executes select count(*) as count from dept where deptName like $deptName. It is also no problem if the number of records >= 2. The problem is when there is 1 piece of matching data. $result["total"]=0, why is this, why not...

大家讲道理 2017-05-16 13:16:02 0  3  539

Thinkphp3 count() method must add fields?

 public function showList(){         $model =D('article');         $total=$model->count(&

Sanys 2021-03-20 17:25:41 0  2  1263

php - How to make mysql add the corresponding count values ​​when inserting data with the same key?

{Code...}{key1:10,key2:100}{key1:30,key3:100}The front is key, and the corresponding one is count. How to let mysql insert data when the same key exists, the corresponding count value Just add them up?

天蓬老师 2017-05-16 13:09:32 0  1  445

javascript - How to count the data in the table with JS

How can I count the data in the table using JS and merge the data as shown in the figure? Please help me solve it.

给我你的怀抱 2017-05-18 10:44:45 0  2  926

java - Count the daily clicks of the top ten ads from 20170403 to 20170420

There is an advertisement table advertise(advertise_id, date, count) with the following data: I need to count the top 10 advertisements in a certain period of time and the number of clicks per day during this period. The result of the query should be that there are 10 pieces of data with different a...

世界只因有你 2017-05-17 10:08:03 0  2  691

mongodb - pymongo count is slow

Thirty thousand pieces of data, each piece of data only contains a random number {"digit": random number}. Requirements: Count the most frequent numbers in the database table table {code...} It takes five or six minutes to run once. Use multi-threading to run it. 100 is not much faster, an...

PHPz 2017-05-17 10:03:55 0  1  1289

MySQL: Display daily count of rows created using inner join?

I have a user and user_data table. I'm trying to display registrations by created_at and group them by today's count and display the records for each day so I can see the delta in user registrations. user_data is optional and is not always present (yet), but I only want to count rows that do have a ...

P粉692052513 2023-09-11 00:12:00 0  1  948

How to group and count in MySQL?

I'm trying to write a query that extracts the total number of undeleted messages sent to friends. Here is a screenshot of the table structure: The output I want to achieve is as follows: idmessages_count--------------------------1456227255This is what I have so far Query tried so far: SELECTu.id,cou...

P粉478835592 2024-04-06 18:30:17 0  1  773

php - How to count the traffic of each website in the Linux server?

There is an Alibaba Cloud ecs with many websites deployed in it. Recently, the server has been particularly stuck. It is found that the number of visits is relatively large and the bandwidth is full. How can I count the traffic statistics of each website in the server and find out which website uses...

为情所困 2017-06-14 10:50:12 0  4  1085

php - mysql big data counts the total number by time. Is it necessary to use count?

1. I want to count the number of new customers today, the number of new customers yesterday, and the number of follow-up records today. The amount of data is very large. The method used before was to add 1 minus 1, but errors often occur. How to solve this? Statistics question? Do I have to use coun...

世界只因有你 2017-05-16 13:11:10 0  2  594

How to display count data to Html using php codeigniter

This is my model code: publicfunctionGetId(){$this->db->select('count(*)astotal');$this->db->from($this->table);$this->db ->where('dibaca',null);$query=$this->db->get();return$query->re

P粉668113768 2024-02-21 20:01:10 0  2  498

Looking for help with MySQL query - Calculate timestamp count within grouped range

One would think this would be easy, but it was a grind all night long. I have a sensor alert log and would like to generate a table with a simple count of events over 24 hours, 168 hours (1 week) and 336 hours (2 weeks) for each different sensor. I'm relatively new to MySQL (running on GoDaddy) and ...

P粉026665919 2024-02-04 11:20:54 0  1  706

Why do I get the "Inserted value list does not match column list: 1136 Column count does not match value count" error when the data matches?

I get the above error but the count of the column and data I want to insert are both 19try{$db=newPDO("mysql:host=$servername;dbname=$dbname",$username,$password);$db-> setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);$sql="INSERTINTOpresc

P粉561323975 2024-03-26 12:34:51 0  2  637

Is full count query really that slow on a large MySQL InnoDB table?

We have a large table with millions of entries. Full counting is very slow, see code below. Is this common for MySQLInnoDB tables? Isn't there a way to speed up this process? Even with query caching, it's still "slow". I'd also like to know why the count of the "communication" ta...

P粉291886842 2023-11-07 15:52:43 0  2  907

Get exact match count in mysql text field

I have a MySql table with text fields. The text field will be populated with a random sequence similar to the following (can be any integer value): 14,4,24,20,34,234,67,4,98,64 There are no leading or trailing commas in the string (text field value). For example, I want to count the total occurrence...

P粉493534105 2023-09-09 10:37:09 0  1  855

How to submit a form How to get the session count without reloading the page when submitting the form

I have created a form with a hidden input form that submits values ​​to a PHP script and stores each value in a session array by reloading the page using AJAX. It returns an HTML success alert message to <pid="msg"></p>. I need information on how to send $count to <pid="...

P粉587780103 2024-03-28 15:35:33 0  1  482