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What is Hadoop used for, what are its main application scenarios and fields, and what are its core problems to be solved? How can we personally

What is Hadoop used for? What are its main application scenarios and application fields? What are the core pro...

From [MySQLdiscussion group] 2020-09-24 16:31:30 0  1  1715

#1045 Unable to log in to MySQL server?

#1045 Unable to log in to MySQL server, how to solve it

From [MySQLdiscussion group] 2017-12-03 21:50:17 0  3  1711

Database creation failed

2020-01-15 03:02:38 MySQL5.7.26 Stopped2020-01-15 03:02:37 MySQL5.7.26 Started2020-01-15 03:02:37 MySQL5.7.26 ...

From [MySQLdiscussion group] 2020-01-15 03:04:50 0  3  1701

I want to learn and master a technology well. Please give me some pointers on the path that everyone has taken. It will save me the pain of detours and pitfalls. I can learn by myself and learn by myself.

First, a summary of self-study. The second is to reduce the learning costs of others. The third is others’ rev...

From [MySQLdiscussion group] 2020-09-25 10:38:02 0  1  1697

Is there any difference in storage between MySQL, VARCHAR(1000) and TEXT (purpose: to store long strings)?

The actual phenomenon is expected to understand the difference between VARCHAR/TEXT when storing large strings...

From [MySQLdiscussion group] 2017-05-18 10:56:22 0  1  1688

python pymysql executes the SQL statement that compares time. It can be executed smoothly in mysql, but why does it report an error when executed in python?

python version: 3.5 mysql version: 5.6 python pymysql executes the sql statement to compare the time. It can b...

From [MySQLdiscussion group] 2017-07-04 13:43:45 0  2  1679

Product specification sheet design

I would like to ask the masters: I want to design a product-related table now, which involves multiple specifi...

From [MySQLdiscussion group] 2019-12-06 18:34:33 0  2  1678

Why doesn't it jump when I enter refresh? Ask God for advice!

<?php header('content-type:text/html;charset=utf-8'); if(isset($_post['submit'])){ $user...

From [MySQLdiscussion group] 2017-11-20 15:07:04 0  1  1671

mysql - 為什么不用駝峰命名創(chuàng)建表名和字段？

例如：user : userId nickName ..userInfo : userAvatar 補(bǔ)充問題：現(xiàn)在編程已經(jīng)不是很多年前那樣，你一套系統(tǒng)也不用跟人家交互。以做接口為例，駝峰命名據(jù)說可以在IOS解析接口的時候...

From [MySQLdiscussion group] 2017-04-17 13:48:46 0  5  1670

centos7無法自啟動 mysql

阿里云ECS 安裝了mysql 5.6，使用 systemctl start mysql成功啟動mysql，可使用 systemctl enable mysql將mysql加入到開機(jī)自啟動，可卻報(bào)錯： {代碼...} 使...

From [MySQLdiscussion group] 2017-04-17 14:52:23 0  4  1663

Why does MYSQL cascade update fail? Any advice?

use my_foreign;create table myforeign2(id int primary key auto_increment,name varchar(20) not null,c_id int,fo...

From [MySQLdiscussion group] 2018-06-21 17:56:33 0  0  1660

Why is there no prompt and no records are added to the database?

From [MySQLdiscussion group] 2018-12-18 21:06:09 0  2  1658

elasticsearch - Elastisearch怎么求查詢結(jié)果的交集，如MYSQL的interset

1.查詢20151216-17所有的名字 {代碼...} 2.查詢20151217-18所有的名字 {代碼...} 如果在mysql中可用如下的語句求得這兩天name的交集 {代碼...} Elastisearch中怎么...

From [MySQLdiscussion group] 2017-04-17 15:58:47 0  2  1655

mysql里concat函數(shù)和 ‘’|‘’ 符號一起用是表示什么？

比如像這種：concat(t4.name,t4.pinyin,t1.trader)|t4.name

From [MySQLdiscussion group] 2017-04-17 15:35:51 0  1  1655

There are a lot of backslashes in the data stored in json format in Navicat for mysql. How to remove them?

When using mysql's json operation, it will be interfered by escape characters, and it is normal to read it. I ...

From [MySQLdiscussion group] 2017-06-06 09:52:07 0  3  1652