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How to get the highest value, lowest value and average value in mysql in php

There are two fields in database table A, one is the category, and the other is the price. How to calculate th...

From [MySQLdiscussion group] 2017-05-18 10:51:53 0  3  944

MySQL floating point precision range and rounding

(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 10:51:23 0  3  1073

In mysql, when writing data, do you need to write the data first and then give the data an id? Or should you give the id first and then write the data to be inserted?

In mysql, the id is automatically increased. Now if you write a piece of data into it, the specific process is...

From [MySQLdiscussion group] 2017-05-18 10:51:19 0  2  680

mysql - 50 million articles, how to make related articles?

Now I segment words by title. Each title has 3 words and a separate tags table is built to store the divided w...

From [MySQLdiscussion group] 2017-05-18 10:51:12 0  1  747

mysql optimization gender optimization

There are hundreds of thousands of users in the database, 90% of whom are men. Sex = 1. For example: select ui...

From [MySQLdiscussion group] 2017-05-18 10:51:08 0  3  866

mysql optimization - How to optimize mysql count(id) query speed?

The table structure is shown in the figure. The current data volume is 8000W rows. Are there any optimization ...

From [MySQLdiscussion group] 2017-05-18 10:51:05 0  7  1187

mysql - sql How to query the third-level subset based on the parent id?

Now there is a need to query the third-level subset database based on fid. A table has three fields (id, name,...

From [MySQLdiscussion group] 2017-05-18 10:51:03 0  2  1063

mysql, the same table modifies one of the two fields based on two of the fields

There is a student table. The table fields include id, name, parent_id, createDate, etc. Now we need to modify...

From [MySQLdiscussion group] 2017-05-18 10:50:49 0  1  803

MySQL data type enum cannot insert data?

(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 10:50:44 0  2  749

mysql - Problems with creating database tables?

I am a novice and designed a social networking website. For example, there is a table of user avatar pictures ...

From [MySQLdiscussion group] 2017-05-18 10:50:40 0  1  833

mysql - String replacement based on dictionary

Source table: Dictionary table: It is expected to replace the values ????in the source table according to the ...

From [MySQLdiscussion group] 2017-05-18 10:50:38 0  1  1146

mysql - sql query problem

There are two tables (only used to represent structures) name code1 --------11 --------21 --------32----------...

From [MySQLdiscussion group] 2017-05-18 10:50:35 0  3  696

mysql - Modify the isbn data of the database so that if the isbn encoding is normal, it will not change. If it exceeds 13 digits, the first 13 digits will be taken directly. How should I write the sql statement?

(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 10:50:27 0  1  707

Can mysql be replaced with regular expressions?

{Code...} This is one of the contents of a field in mysql. Can it be replaced by regular expression? {Code...}...

From [MySQLdiscussion group] 2017-05-18 10:50:24 0  1  882

How does MySQL implement nesting of another table within a table?

1. I am a database novice... If I want to implement column A in table 1 of database and nest the column BCD in...

From [MySQLdiscussion group] 2017-05-18 10:50:13 0  1  786