Basic operation of MySQL Basic operation of data: CRUD (Create, Retrieve, Update, Delete Classified according to the object of operation, basic SQL operations can be divided into:
library operati
Tag: mysql
Use PyCharm to operate MySQL database
Install PyMySql template
pip install pymysql
Configure MySQL connection parameters
pymysql.Connect()
host , Post, user, passwd, db, charset
Get cursor() object
c
MySQL Database Application (5) SQL Language (2)
3. Delete redundant accounts in the MySQL system
Syntax: drop user “user “@”Host Domain” <----Pay attention to the quotation marks, which can be single or double quotation marks, but they can
Mysql – ColdFusion for parameterized queries
I have a query that I run to fill the CFChart that I am trying to parameterize:
SELECT *
FROM closed_tickets
WHERE MONTH(closed_date) = #month#
AND YEAR(closed_date) = #dateFormat(theMont
Mysql thousands of large data query optimization
1. Optimize queries and avoid them as much as possible For a full table scan, you should first consider establishing an index on the columns involved in where and order by. 2. Try to avoid the wh
Mysql common operation
mysql backup:
docker exec container ID mysqldump -uroot -p password–databases library name> library name.sql –Create user:
create user ‘username’@’%’ IDENTIFIED BY ‘password’;
–Create
If there is a column in MySQL, use the alter to delete columns
If the column exists, how to use ALTER to delete a column in the MySQL table?
I know that I can use ALTER TABLE my_table DROP COLUMN my_column, but if my_column does not exist, an error will
[11] mysql: optimization
The words written in the front
Whether as an operation and maintenance or as a DBA, our job is not to write SQL and engage in business . More is how to achieve a good and fast way to provide
MySQL foundation advancement
Common functions: Character functions: Length field character length Concat connection substring Substr intercept Substring Instr Insert substring Remove both ends of trim Upper to upperca
Import Excel data for mysql using Navicat Premium
1. Create a data table based on sql.
2. Steps to insert data
3. Error message
1.Data too long for column’ccs_login_name’ at row 1
Modify the character length of ccs_login_na