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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

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 - sql statement optimization issues

{Code...} Assuming that the amount of data in table c is millions, how to optimize these two pieces of data to...

From [MySQLdiscussion group] 2017-06-14 10:50:39 0  4  1164

MySQL分表之后如何做排序的問題?

我有一個(gè)文章表，它有上千萬條數(shù)據(jù)，我要分表，分成100個(gè)表，每個(gè)表就有10萬條數(shù)據(jù)，但是如何做排序呢？不能每次都去查詢這100個(gè)表把?；蛘哂惺裁春玫姆直矸绞?？

From [MySQLdiscussion group] 2017-03-04 14:15:29 0  2  1163

Mysql master-slave replication REPLICATE_DO_DB parameter rolls back to the initial settings every time after the slave server reboots

I built mysql master-slave replication on Microsoft Cloud and used bitnami with replication. My.cnf configurat...

From [MySQLdiscussion group] 2017-05-18 10:54:55 0  3  1163

I'm new here. I started reading MYSQL. Now in which course is it mentioned that configuring Apache's virtual host is taught?

I'm new here. I started reading MYSQL. Now in which course is it mentioned that configuring Apache's virtual h...

From [MySQLdiscussion group] 2019-05-16 11:55:07 0  1  1162

Database - MySQL InnoDB Full-Text, how to expand Chinese word segmentation search?

Many foreign programs, such as Chevereto https://github.com/Chevereto/... all use Full-Text, which makes it im...

From [MySQLdiscussion group] 2017-06-22 11:54:47 0  1  1159

mysql報(bào)錯(cuò) 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

mysql - pt-query-digest 使用 since 參數(shù)的時(shí)候，總是提示 No events processed

{代碼...} 已經(jīng)加了一個(gè) event，已經(jīng)確定日志里有該日期以后的數(shù)據(jù)了?？戳?官方文檔，說： {代碼...} 但還是沒解決問題。因?yàn)榫W(wǎng)上有很多例子都是這么寫的，所以很郁悶。

From [MySQLdiscussion group] 2017-04-17 14:23:20 0  1  1157

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

mysql - mariadb 無法啟動(dòng)服務(wù) macOS

{代碼...} mariadb是透過homebrew裝的，很久之前都可以使用（軟件版本已經(jīng)升級(jí)過），沒有修改過配置，錯(cuò)誤日志如上。

From [MySQLdiscussion group] 2017-04-17 15:17:11 0  1  1156

The issue of not using whereNotExists clause correctly in Laravel 8 Eloquent remains unresolved

I have two tables, one is a table with different users and the other is an invoice table called "factures...

From [MySQLdiscussion group] 2023-09-05 16:08:35 0  1  1154

Ask a question about mysql data burst

A table user data has the following id----user----num1----aaaa----02----bbbb----2. There is a php file. When e...

From [MySQLdiscussion group] 2020-10-18 14:29:45 1  1  1153

mysql syntax where abbreviation?

I came across a piece of SQL today that I can’t understand, please help! A mysql query statement: {code...} an...

From [MySQLdiscussion group] 2017-06-10 09:49:43 0  2  1153

In a mysql table, is it possible to insert data into multiple connections at the same time?

If at one ten thousandth of a millisecond or one millionth of a millisecond, at exactly the same moment, can t...

From [MySQLdiscussion group] 2017-05-27 17:39:16 0  2  1153