dying87 Ask a question 2022-11-04 18:02

Question sql detects the null data problem

select * from audio_data a left join exec_data b on a.id= B.ail_audio where b.ail_audio ='5' Why do I find this data is null?

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qznxcyp Ask a question 2022-11-04 18:02

Question c language application basis and basic operations

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Mr_Sun73 Ask a question 2022-11-04 18:03

Question int main（void）不是返回值类型函数吗？为什么又加个void？

int main（void）代表什么意思？返回值类型可以用void吗

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dutefei Ask a question 2022-11-04 18:03

Question java uses itext to convert word to powerpoint without showing Chinese

java converts word to ppt using itext and uses the main method to run the converted pdf without problems but using the interface mode The converted pdf does not show Chinese. What is the situation ? ...

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koxingchen Ask a question 2022-11-04 18:03

Question No error is reported. Why does the run result show an underflow error

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dandan1980 Ask a question 2022-11-04 18:03

Question STM32 AdC sampling

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dengzhengsha Ask a question 2022-11-04 18:03

Question PIP dNS python3.11

Ask, my python is installed in version 3.11, but no corresponding version is displayed when installing dns module, go to Tsinghua source, douban source is displayed in no version, Is my python ins tallation too far ahead of its time(I've tried everything with pip updates, it doesn't work) ERROR: Could not find a version that satisfies the requirement dns(from versions: none) ERROR: No matching distribution found for dns ...

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zzbbenben Ask a question 2022-11-05 11:31

Question tomcat access errors are suddenly fixed automatically

tomcat access to the database data console repeatedly printed error information, error information com.alibaba.druid.support.logging.Jakarta CommonsLoggingImpl. error create connection SQL Exception url: jdbc:mysql://localhost3306/ssm_cinema? server Timezone=UTC&useSSL=false, error Code 0, state 08S01 com.mysql.jdbc.exceptions.jdbc4. CommunicationsException: Communicati ons link failure com.alibaba.druid.support.logging.JakartaCommonsLoggingImpl.error create connection SQLException, url: jdbc:mysql://localhost3306/ssm_cinema? serverTimezone=UTC&useSSL=false, er...

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dengwei99 Ask a question 2022-11-05 11:32

Question The meaning and use of find, c language

int find=0; while(! Find) < br / > {< br / >... } loop content omitted,! What does "find" mean? When does it loop?

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dunkyyan Ask a question 2022-11-05 11:32

Question Key control 7 LEd digital display, simulation display out of order problem

Symptom and background of the problem Key control 7-segment LEd digital display, simulation display out of order The code is as follows #include < reg52.h> #define SEG P0 // Co nnect port P0 to 7 sections of nib tube char TAB[10] = {0xc0, 0f9, 0a4, 0b0, 099, 092, 083, 0f8, 080, 098}; // define common anode array 0 1 2 3 4 5 6 7 8 9 void debouncer(void); // Ant i-jitter function sbit PB1 = P2^0; //FB1 with P2.0 sbit PB2 = P2^1; //FB2 P2.1 main() { unsigned char i = 0; PB1 = PB2 = 1; / / set the input port to 1 < / span > <...

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ddl301 Ask a question 2022-11-05 11:57

Question form-data Sends data and files. It can receive only data but cannot receive files

Use form-data to send data + files to the back end. The back end can only receive data, but cannot receive files The project is springboot + vue Code received by the back end: Front-end sends code: Why, ...

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cyok5656 Ask a question 2022-11-05 11:58

Question anaconda failed to install pyecharts. Procedure

How to install this library ah, always failed, tried many ways. Urgent need to install data analysis ah!

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cy199025 Ask a question 2022-11-05 11:58

Question How does java understand rewriting the equals and HashCode methods

because we want to use the HashSet group to keep the title from repeating. Override the equals and HashCode methods < br / > here, please rewrite the equals and HashCode methods should be how to understand? public class Question { private String Title;//题干 private String Answer;//正确答案 public Question(String Title,String Answer) { //title是题干，answer是对应答案 this.Titl e=Title; this.Answer=Answer; } public String getTitle() { return Title; } public String getAnswer() { return Answer; } //为了使得HashSet组中的题干唯一，需重写equals方法...

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dazhao2007 Ask a question 2022-11-05 11:58

Question Paddlepaddle created data set video memory burst

Symptom and background of the problem Video memory soared when I created my own data set with paddlepaddle in Baidu AI Studio environment Insert code with code block function, do not pas te screenshot import os from paddle.io import dataset import paddle.vision.transforms as transforms from paddle.io import dataLoader import paddle import cv2 change = transforms.ToTensor() class FlameSet(dataset): def __init__(self,img_path,row_label_path,col_label_path): img_list = [] label1_list = [] label2_list = [] img_dir = img_path col_label_d...

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cwl6985839cwl Ask a question 2022-11-05 11:58

Question How do I change the jdk17 of idea into jdk1.8

How to change the idea jdk17 to jdk1.8 The setup and the project structure, which was originally jdk17, changed to jdk1.8 but it still got an error

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