???? MySql will generate some logs during the running process, and now for the consistency of the master-slave data synchronization problem, as well as database recovery, database optimization, dat
Currently I have several tables with 100k rows. I am trying to find the following data.
* , SQRT(POW(69.1 * (latitude-‘49.1044302’), 2) + POW(69.1 * (‘-122.801094’-longitude) * COS(lat
I tried to select only today’s records from the database table.
Currently I use
SELECT * FROM `table` WHERE (`timestamp`> DATE_SUB(now(), INTERVAL 1 DAY)); But it needs the results of t
1. Character set and verification rules Character set is a set of symbols and codes, and collation is a set of rules for comparing characters in a character set. That is, the collation of the chara
select a.day_num as “Serial Number”,
a.create_time as “Shelf time”,
a.clue_num as “The amount of vehicles on the shelves”,
((a.clue_num/b.clue_num)-1) as “Chain Ratio”
This is an article about MySQL, mainly introducing MySQL index
# #1. Introduction to Indexes
An index is also called a key in MySQL. It is a data structure used by the st
I am looking for analysis functions like PARTITION BY in MySQL (see docs for more information)
Does it exist ?
MySQL 8.0 now supports window functions.
I am l
I have read about database system concepts, 6th edition, Silberschatz. I will implement the university database system shown in Chapter 2 on MySQL’s OS X. But I’m in the course of creating tables I
The transaction in MySQL is the smallest indivisible unit of work, and the transaction can ensure the integrity of a business
There are multiple SQL statements in a business, and these SQL st
What is a view? For example, if there is a basic table, user 1 can view the data and can view fields 1 and 2, and user 2 can view the fields 3 and 4, then these two users There are different views