Data analysis - java data mining analysis ideas

Let me talk about my idea first: monitor the prices of many items on Taobao at the same time, and then obtain the price trends (I plan to write a crawler to obtain this myself, and then store it in the database), but the question arises: how should I store the data so that I can analyze it? Which it...

过去多啦不再A梦 2017-05-17 10:00:51 0  4  778

Want to use python for data analysis

Hello, I want to learn python to do data analysis and data visualization. Is it consistent with the learning direction of our course?

紫鸢 2019-06-19 10:31:07 0  1  1635

How to store the analyzed dictionary data in the database in Python 3.5

{Code...} I am using the database linked by pymysql. The statistical data before was a single row, so I used this {Code...} Now it is multi-row. How do I save it to the database? The database has two fields, respectively. It is keywords, and count, which correspond to the contents in the dictionary ...

ringa_lee 2017-05-18 10:59:27 0  2  771

Data transfer part

I don’t quite understand which part of the code is used to transfer the data entered by the user to the database.

Liu_ 2017-12-17 23:16:23 0  1  1172

How sklearn trains large-scale data sets - Stack Overflow

Question 1: Now I have more than 400,000 pieces of data. I need to use some kind of machine learning classification algorithm to build a model for this data. The problem I encountered is that the data is too large and cannot be read at once, so I want to ask. What to do with the data? Question 2: Th...

typecho 2017-06-28 09:22:17 0  3  1147

javascript - After Ajax returns the data in json format, the data taken out after parsing is undefined?

As the title says, the background data format is as shown in the figure. Some data are read in the front desk, and some data show undefind. Even if I use the eval function to convert it, it doesn't work. Solve...

女神的闺蜜爱上我 2017-06-27 09:19:48 0  3  928

php - How to split large batches of data?

Hello everyone, there are 10,000 orders in the database, and various calculations need to be performed on the orders every day. The language used is php+mysql. Because so much order data was not considered in the previous design, I used a very conventional method of writing and updating all the data...

女神的闺蜜爱上我 2017-06-24 09:41:39 0  2  1028

mysql - Why does database read-write separation improve database performance?

Please see the blog above for why read-write separation can improve database performance. According to database common sense, read-write separation can indeed improve database performance, but you don't know if you understand its underlying principles. For example, one reads and one writes, but the ...

PHPz 2017-05-24 11:34:46 0  2  1348

mysql - tens of millions of data paging, when the offset turns out to be larger, how to optimize the speed?

Taking mysql as an example, when the amount of data is generally large, the offset will be larger when paging, and the query efficiency will be lower. For example, if a post has 2 million comments, and 10 are displayed on each page, there will be 200,000 pages. When How to process the data if we tak...

伊谢尔伦 2017-05-18 10:48:01 0  2  932

java - What website can I use to learn about the release and sharing of Alibaba's backend, big data, and cloud computing technologies?

What website can I use to learn about the release and sharing of Alibaba’s backend, big data, and cloud computing technologies?

PHPz 2017-05-27 17:40:14 0  1  1013

php - Please see why there is an error in parsing this json data

Why is there an error in parsing json data?

PHP中文网 2017-06-28 09:22:16 0  5  820

Teacher, can you share the data file page of your dynamic data interface?

Teacher, can you share the data file page of your dynamic data interface?

手机用户1587341322 2022-01-23 14:06:27 0  2  1064

javascript - Ajax requests background data through the interface. When to use put, get, and post? Please give advice.

Ajax requests background data through the interface. Please give me some advice on when to use put, get, and post.

滿天的星座 2017-05-19 10:25:20 0  7  531

mysql - Problem with database splitting into tables and databases?

As a simple example, take the order form. For example: 1 merchant. The uids of the 10 users are [1,2...,10]. 10 orders from 10 users are in one data table A. Now we need to divide the tables horizontally according to the uid, and divide the 10 orders into 10 tables, that is, there are 10 tables A0, ...

为情所困 2017-05-18 10:49:13 0  1  616

Assign data to PHP variables

I want to get the data of two variables using the same method but nothing happens functiondisplay(){$datas=Req::all();$products=Product::all();returnview('products.dispaly')->with ('products',$products,'datas',$datas);}Here I want to get the data from the table and assign them to two separate var...

P粉256487077 2023-09-05 13:12:09 0  1  526

Dear newbies, please kneel down and ask for mysql data.

Do you guys have that kind of professional data sheet? Our company needs other people’s expertise to write an app, and there are many majors in China. I need the data in it, but Baidu can’t find it yet. If you guys have it, please give me a copy.

A、 2018-12-06 11:53:05 0  0  1127

Please give me some advice on how to use thinkphp5.1 to process large amounts of mysql data.

I have a requirement here, local database (one): one table user_local, remote database (two databases, five tables in total). All information is associated with a database (user_data_a) through uid. There is only one table user_basic, which is the basic table for all users. Information, the other fo...

实力单身典范 2019-06-27 15:16:12 0  1  1272

mysql - How does phpmyadmin export data in sections?

My database has 1.9 gigabytes. How can I export a 100M file in batches?

大家讲道理 2017-05-24 11:34:42 0  4  1096

Data refresh display - how to display data in the database like flight information on a large screen at an airport

There are n pieces of data in the database (which may change in real time). Now I want to display 8 pieces of data at a time on the big screen. How to automatically scroll P and display it in real time? Display like flight information on a large screen in an airport

王 2018-06-14 10:07:14 0  6  2110

Group 2D array data using column values ​​to generate 3D array

I have a multidimensional array that I want to group based on the values ​​in a specific column. I want to group based on level, but I don't know the value of level in advance. So, I can't say while$i<7 like in the for loop because I don't know that 7 is the maximum value for the level key, and e...

P粉022140576 2023-08-22 18:37:00 0  2  603