mysql - Should I use left join or not in in the following statement?

Implementation: Query records in a that are not related to b {code...} {code...} Which one is better, or if th...

From [MySQLdiscussion group] 2017-06-06 09:52:24 0  2  1106

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  1105

sql注入是什么意思？

听到别人提到了  不知道什么意思新手求勿喷。。。

From [MySQLdiscussion group] 2016-12-20 16:49:51 0  2  1104

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  1104

mysql报错 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  1103

Apache running error

From [MySQLdiscussion group] 2017-09-21 10:11:27 0  2  1102

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  1102

MAMP cannot start Mysql Server

My computer had mysql installed before. Yesterday I deleted the original mysql in order to install mamp. ​​Acc...

From [MySQLdiscussion group] 2017-06-20 10:05:47 0  3  1101

mysql - 数据库表之间设置外键是否可以提高查询效率？

我们知道，设置主键、唯一索引可以提高查询效率，但设置外键约束可以提高查询效率吗？外键约束除了用来防止数据不正确外，是否可以提高查询效率？现在我们项目中很多时候只是在代码里面通过业务进行关联，数据库...

From [MySQLdiscussion group] 2017-04-17 16:08:22 0  7  1101

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  1100

Which of these methods is better?

Excuse me, which of the methods in the video is better?

From [MySQLdiscussion group] 2018-10-21 11:19:57 0  0  1099

sql常用语法请教

1.表结构已经有，字段也已经有，为字段添加comment备注信息的SQL ，该如何写？修改字段的comment的SQL ，又该如何写？2.表结构已经有，字段也已经有，修改表名comment的sql ，该如何写？

From [MySQLdiscussion group] 2016-11-17 15:26:19 0  1  1099

Utf8_general_ci 和 utf8_unicode_ci的区别是什么 ？

From [MySQLdiscussion group] 2016-12-20 16:26:40 0  3  1097

MySQL分表之后如何做排序的问题?

我有一个文章表，它有上千万条数据，我要分表，分成100个表，每个表就有10万条数据，但是如何做排序呢？不能每次都去查询这100个表把。或者有什么好的分表方式？

From [MySQLdiscussion group] 2017-03-04 14:15:29 0  2  1096

slow-start - [ERROR] Failed to write to mysql.slow_log

{代码...} I have a mysql server5.6. mysql> set global log_output = 'TABLE'; Always output error informati...

From [MySQLdiscussion group] 2017-06-28 09:23:18 0  1  1095