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mysql - How to implement multi-table association query?

{Code...} The above are three tables in the database, related through UserID. Table A is a user login informat...

From [MySQLdiscussion group] 2017-07-04 13:44:12 0  1  1203

python problem of retrieving URLs from mysql database

After fetching the link from the database, it prints out like this, {code...} The type of the field in the dat...

From [MySQLdiscussion group] 2017-07-04 13:43:48 0  2  1137

How to group in mysql?

Assume that the user table id name group 1 evan admin 1 evan1 admin 1 evan2 admin 1 evan3 user 1 evan4 user se...

From [MySQLdiscussion group] 2017-07-04 13:43:47 0  2  1164

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  1675

QT compilation of MySQL driver fails repeatedly in Mac environment? how?

Official method. When I execute make compilation, an error occurs. I have used homebrew to install mysql-conne...

From [MySQLdiscussion group] 2017-07-04 13:43:43 0  1  1062

mysql group by only displays one?

Suppose the user table | id | name | group || 1 | evan | admin || 2| charlie | admin|| 3 | kid | user || 4 | w...

From [MySQLdiscussion group] 2017-07-04 13:43:42 0  3  1156

How does mysql determine if the data does not exist and then insert it?

When inserting data, can we merge the following requirements into one SQL statement? 1. Determine whether the ...

From [MySQLdiscussion group] 2017-07-04 13:43:40 0  4  1104

mysql - How does PHP handle the Duplicate entry '' for key 'num' (23000) problem caused by unique indexes?

I have a project that requires interface transmission, which is similar to recharge. I need to receive the ord...

From [MySQLdiscussion group] 2017-07-04 13:43:35 0  3  1164

MySQL displays Chinese weekday - Stack Overflow

I set set lc_time_names='zh_CN'; in the database and used SELECT @@lc_time_names; to query it and it changed i...

From [MySQLdiscussion group] 2017-07-04 13:43:34 0  1  1055

mysql - After Navicat imported the dumped sql file, I found that some data was not displayed on the website.

I use navicat for mac. My steps are to right-click to select the database name in the official website, right-...

From [MySQLdiscussion group] 2017-07-04 13:43:29 0  4  2063

php - msyql4 characters

Original sql field information: koubei_desc text COMMENT 'Word of mouth description (optimal)' I want to modif...

From [MySQLdiscussion group] 2017-07-04 13:43:26 0  1  968

mysql - How to implement union and then limit in continuous operation in ThinkPHP3.2.3?

(www.sf.gg) is China's leading developer technology community. We hope to provide a pure, high-quality technic...

From [MySQLdiscussion group] 2017-07-04 13:43:25 0  1  1050

mysql - database table structure design

Describe the requirements: Now we need to design the database table structure. There are many types of rules. ...

From [MySQLdiscussion group] 2017-06-30 09:55:23 0  3  1173

MYSQL creates a unique index on the primary key

I just came to work in this company, and when I checked their database, I found that they had created a unique...

From [MySQLdiscussion group] 2017-06-30 09:55:11 0  3  1216

mysql報錯 unknown column 'a.plat' in ON clause

{Code...} Why does an error like unknown column 'a.plat' in ON clause appear?

From [MySQLdiscussion group] 2017-06-30 09:54:48 0  1  1157