mysql - Find SQL statement

How to use SQL statements to realize the sum of each column in Total 1, Total 2, and Total 3?

From [MySQLdiscussion group] 2017-05-18 10:50:09 0  2  753

Database - Questions about installing MySQL?

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

From [MySQLdiscussion group] 2017-05-18 10:50:02 0  6  714

Restore data - only the mysql data directory remains How to restore innodb data

I have newly installed mysql and used the previous directory. After opening it, I only see the table but no da...

From [MySQLdiscussion group] 2017-05-18 10:49:53 0  1  613

mysql - Some problems with label tables

I just learned mysql and am not familiar with mysql. Now I have three tables like this: article table id title...

From [MySQLdiscussion group] 2017-05-18 10:49:42 0  2  734

Query the data of a specified date in a specified table in mysql database? There are details

{Code...} The above is the existing query statement, which can find all the tables in the entire database and ...

From [MySQLdiscussion group] 2017-05-18 10:49:37 0  2  1015

Should the length of varchar type in MySQL be a multiple of the field's encoding?

I once saw someone on stackoverflow saying that it is recommended that when the length of the varchar field ca...

From [MySQLdiscussion group] 2017-05-18 10:49:34 0  3  619

Why does the order change after mysql uses group_concat?

Since the fields in the two tables contain a one-to-many relationship, the group_concat function was used to s...

From [MySQLdiscussion group] 2017-05-18 10:49:30 0  1  855

mysql statement writing

A table has six fields ABCDEF. The requirement is to find out whether ABCD is consistent and merge it into one...

From [MySQLdiscussion group] 2017-05-18 10:49:22 0  2  626

mysql - SQL identifies different data in two tables

There are two tables with about 10,000 rows. We need to query the rows that are different. The current code is...

From [MySQLdiscussion group] 2017-05-18 10:49:15 0  2  705

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]. 1...

From [MySQLdiscussion group] 2017-05-18 10:49:13 0  1  571

Mysql 5.7.18 cannot find the configuration file my.cnf under mac OSX10.12.4 (16E195)

As the title states, the Internet says that the my.cnf file is found for configuration, but this version of my...

From [MySQLdiscussion group] 2017-05-18 10:49:09 0  1  821

What operations will cause mysql's binlog_size to quickly increase?

The binlog_size of mysql increases rapidly. What is the reason?

From [MySQLdiscussion group] 2017-05-18 10:49:03 0  3  832

mysql - Can sql injection be avoided by simply escaping single quotes and backslashes without using a prepare statement?

For example, if I enter the login name login_name as \', I will spell out this sql: {code...} If I enter the l...

From [MySQLdiscussion group] 2017-05-18 10:48:57 0  1  786

mysql - How to design a table for this hierarchical one-to-many model with unbalanced hierarchies?

Recently I encountered a very tangled business model: I want to design a question bank for a teacher training ...

From [MySQLdiscussion group] 2017-05-18 10:48:38 0  4  707

mysql queries data with valid ID number field value

Some values ​​in the ID number field in the table are invalid. How can I check the valid information for the I...

From [MySQLdiscussion group] 2017-05-18 10:48:22 0  2  1127