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Database basic commands
2022-07-06 07:47:00 【√ far away】
Catalog
2、 Displays all databases in the system
4、 Create a table using a database
12、union select combination information_schema database
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1、 Connect to database
mysql -u root -p
Enter the password and the connection is successful
2、 Displays all databases in the system
show databases;
3、 New database
create database studdent;
4、 Create a table using a database
5、 Add data
View content
6、 Delete data
7、 Modifying data
8、 Query data
9、order by usage
take result The data in the table is sorted according to the score ;
Display with id by 1,name by 2,score by 3 Sort ;
10、limit usage
11、union select usage
12、union select combination information_schema database
MySQL5.0 There is a version called information_schema The database of , It stores all the information in the database , It's about MySQL Information about all other databases maintained by the server . Such as database name , Table of database , Data type and access right of table column . and 5.0 There is no .
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