I am learning the code in Lua and encountered a problem with my code. This is the first time I use a table. Whenever I call a specific table in another table, My type is nil, and the print table do
Tag: table
What is the fastest way to find a big table in radius mysql (latitude longitude)
Currently I have several tables with 100k rows. I am trying to find the following data.
SELECT
* , SQRT(POW(69.1 * (latitude-‘49.1044302’), 2) + POW(69.1 * (‘-122.801094’-longitude) * COS(lat
MySQL Optimization: How to avoid back inquiry
Reference: https://www.cnblogs.com/myseries/p/11265849.html
InnoDB has two types of indexes: clustered index (clustered index) index) and ordinary index (secondary index)
The leaf node
What is the HOST column of the User table in mysql?
Execute use mysql; then execute show tables; you can see all the tables in mysql
Execute desc user; you can see the table structure of user
You can see that host is a column in the user table , Exe
MySQL table relationship
One, field operation #Create a tf1 table with id as the primary key and increment, x and y are both int type create table tf1( id int primary key auto_increment, x int, y int); ”’Modify”’ 1
MySQL table name is not case sensitive setting method
After mysql is installed under windows system, it is not sensitive to the case of table names by default, but under linux, some systems need to be set manually. Log in as root, open and modify /etc
MySQL tables and fields
Database import
File storage data, multiple files are placed in a folder for unified management system
Database classification
mysql installation and use
basic operation of database create show use
Mysql – Detect lock table (locked by lock table)
Is there a way to detect locked tables in MySQL? I mean the table locked by the LOCK TABLE table WRITE/READ command.
(Please note that readers interested in detecting named locks acquired usi
Mysql library, table, record, related operations (1)
Library, table, record, related operations (1) Database configuration # The purpose of unified configuration through the configuration file: unified management of the server (mysqld) and client (cl
Remember to deal with the experience of the mysql database
One day, the user table in the production environment suddenly locked the table for no reason. I thought it was just an occasional bug. So the first solution that came to my mind was simple and rud