mysql千万级数据查询的方法

例如有一张日志表，3个字段：id（int，primary key，auto_increment）、content（text）、create_time（datetime），表中有3000万条数据，没有索引，现在要在不改变表...

From [MySQLdiscussion group] 2016-11-07 15:58:23 0  1  624

How to return response from async call?

How to return response/result from function foo which makes async request? I've tried returning a value from t...

From [MySQLdiscussion group] 2023-10-08 20:41:15 0  2  623

mysql procedures should only return status to unix scripts

I have a mysql program that has out parameters and some print statements for debugging. I'm calling this proce...

From [MySQLdiscussion group] 2023-09-08 09:44:26 0  2  623

How to calculate the difference between two SQL queries

I want to do subtraction between entotalitem and exotalitem, the query I am using is to retrieve data from the...

From [MySQLdiscussion group] 2023-09-07 20:06:33 0  1  623

mysql update query update A SET acid = (SELECT);

I wonder if there is a way to complete this update? {code...}

From [MySQLdiscussion group] 2017-05-25 15:08:15 0  1  623

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  623

node.js - sequelize如何插入emoji表情？

问题描述 在MySQL的shell中可以添加emoji表情，但是使用sequelize就不行了。 表中带???的就是使用sequelize插入的数据，带emoji的是在shell中手动插入的。 sequelize配置： ...

From [MySQLdiscussion group] 2017-04-17 15:46:59 0  1  623

mysql - 时间戳是存成字段int(11) char(11) ？

时间戳是存成字段的话，哪个更好呢？ int(10) char(10) ？

From [MySQLdiscussion group] 2017-04-17 11:43:35 0  1  623

Optimize your use of interval functions

I have to do the following: rank users with persona='z' in order from highest to lowest in the last week. I wr...

From [MySQLdiscussion group] 2023-09-14 16:24:44 0  1  622

How to distribute duplicate rows in MySQL output?

I have a MySQL query that outputs rows in random order. Each row has a name column, and sometimes queries may ...

From [MySQLdiscussion group] 2023-09-13 15:45:37 0  1  622

How to join a table to itself by keys in different columns that can be NULL

I have a data set (example 5 fields) as follows. start date time number 1 number 2 key 1 key 2 November 21, 20...

From [MySQLdiscussion group] 2023-09-09 11:27:14 0  1  622

How to enable remote access to mysql docker's root user in docker-compose file?

Currently I'm using the following simple YAML file to start a MySQL server version:'3.3'services:db:image:mysq...

From [MySQLdiscussion group] 2023-09-06 13:10:11 0  1  622

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  622

MySQL如何查询当天产生的全部数据？？？

数据表中存放的是系统出/入账记录,要做统计,每天出一份账单表显示当天的收支记录,这种查询的SQL语句该怎么写呢???

From [MySQLdiscussion group] 2017-04-17 16:27:45 0  1  622

mysql - express本地开发的项目怎么部署到服务器

使用express+mysql开发的项目，本地测试完毕，怎么部署到服务器，谢谢。

From [MySQLdiscussion group] 2017-04-17 16:19:09 0  1  622