Posted on Sun, 19 Jan 2020 09:50:36 -0500 by Kingskin
1. String function
length(a) gets the length of string a
concat(a,b,c) splices multiple values into a string
trim(a) remove the space at the beginning and end of string a
replace(a,b,c) replace the b string in string a with C
subString(str,index,len) intercepts the string str from the index char ...
Posted on Sun, 19 Jan 2020 00:42:01 -0500 by Murciano
In Python, reflection refers to manipulating the properties of an object through a string, involving the use of four built-in functions (all objects in Python, classes and objects can use the following four methods)
# hasa ...
Posted on Sat, 18 Jan 2020 09:49:04 -0500 by littlehelp
Learning objectives: master the following sql functions
Digital function: format ABS mod ceil floor ground expCharacter function: upper lower char > length concat instrDate function: now date? Format date? Add DateDiff if ifnullConditional function:
First batch of digital functi ...
Posted on Fri, 17 Jan 2020 09:10:21 -0500 by DKY
Chapter 1: Nine analysis takes you easy to finish the installation of helm3
The second chapter: Nine analysis takes you to the public warehouse of helm3
The third chapter: Nine analysis takes you through the explosion of helm3 private warehouse easily
The fourth chapter: Nine analysis takes you easy
The fifth chapter: Nine analy ...
Posted on Thu, 16 Jan 2020 13:34:51 -0500 by reli4nt
MySQL is a kind of relational database, which has strong query function, high data consistency, high data security and supports secondary index. However, the performance is slightly inferior to that of non relational databases, especially for data above one million levels, which is easy to cause slow query. At this time, we need to ana ...
Posted on Thu, 16 Jan 2020 02:02:29 -0500 by nuying117
Previous articles paved the way for MySQL master slave building:
Article 1: Common settings for Binlog in MySQL
Article 2: MySQL Master-Slave Synchronization-Principle-Practice
Start the two mysql servers for Master and Slave with the following information:
➜ ~ docker ps -a
CONTAINER ID IMAGE ...
Posted on Wed, 15 Jan 2020 21:08:24 -0500 by powergen
What is mysql's master-slave replication?
MySQL master-slave replication refers to the replication of data from one MySQL database server master node to one or more slave nodes.MySQL replicates asynchronously by default, so that the master server is not always accessed by the slave node to update its own data, which can be updated over a remote ...
Posted on Wed, 15 Jan 2020 20:55:58 -0500 by Cinquecento
Author: Du Kaisheng
1, Connection related
2, Long affairs
3, Metadata lock
4, Lock wait
5, Global read lock
6, Memory usage monitoring
7, Partition table
8, Database information overview
9, Tables not updated for a long time
10, Primary key, index
11, Storage engine
12, Real time load
1) This article involves a lar ...
Posted on Wed, 15 Jan 2020 04:10:52 -0500 by johnsonzhang
Dockerfile is the description file of the image file in docker. The straight white point is exactly what the image file is composed of step by step. for example: you bought a hanger on Taobao, but the seller did not send you a complete hanger, but some components and a drawing. You assemble the hanger step by ...
Posted on Wed, 15 Jan 2020 03:25:46 -0500 by venom999